CN114997078A - Wind driven generator flow field simulation test method and device - Google Patents

Wind driven generator flow field simulation test method and device Download PDF

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CN114997078A
CN114997078A CN202210450098.5A CN202210450098A CN114997078A CN 114997078 A CN114997078 A CN 114997078A CN 202210450098 A CN202210450098 A CN 202210450098A CN 114997078 A CN114997078 A CN 114997078A
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flow field
driven generator
area
wind driven
wind
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应锐
梁湿
高猛
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Sany Renewable Energy Co Ltd
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Sany Renewable Energy Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/83—Testing, e.g. methods, components or tools therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/84—Modelling or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/06—Wind turbines or wind farms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Mechanical Engineering (AREA)
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Abstract

The invention relates to the technical field of new energy, and provides a method and a device for simulating and testing a flow field of a wind driven generator, wherein the method comprises the following steps: performing transient fluid dynamics simulation on the wind driven generator at the current moment based on the three-dimensional flow field model of the wind driven generator to obtain simulation data of the wind driven generator and the three-dimensional flow field model at the current moment; acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator; and updating the rotating speed of the reference coordinate system of the revolution region in the three-dimensional flow field model and the rotating speed of the grid nodes of the autorotation region in the three-dimensional flow field model based on the simulation control parameters. The method and the device for simulating and testing the flow field of the wind driven generator can perform unsteady computational fluid dynamics analysis on the variable speed and variable pitch process of the wind wheel under the running state of the wind driven generator, simulate and consider the variable speed and variable pitch action of the wind driven generator, obtain the transient flow field calculation result which is closer to the actual situation, and obtain the more accurate simulation test result.

Description

Wind driven generator flow field simulation test method and device
Technical Field
The invention relates to the technical field of new energy, in particular to a method and a device for simulation test of a wind driven generator flow field.
Background
Wind power generation has been receiving increasing attention and attention as a way of utilizing clean green energy. The simulation test of the wind driven generator has important significance on the high efficiency, reliability, correctness and uniformity of the design and implementation of the wind driven generator.
In the prior art, a simulation test of the wind driven generator can be performed based on a Computational Fluid Dynamics (CFD) method, but the existing wind driven generator flow field simulation test method is difficult to accurately simulate the flow field change of the wind driven generator in the process of dynamic change of the wind wheel rotation speed and the blade pitch angle. Therefore, how to accurately simulate the flow field change of the wind driven generator in the process of dynamically changing the rotating speed of the wind wheel and the pitch angle of the blade is a technical problem to be solved urgently in the field.
Disclosure of Invention
The invention provides a method and a device for simulating and testing a flow field of a wind driven generator, which are used for solving the problem that in the prior art, the flow field change of the wind driven generator is difficult to accurately simulate in the process of dynamic change of the rotating speed of a wind wheel and the blade pitch angle, and the flow field change of the wind driven generator is more accurately simulated in the process of dynamic change of the rotating speed of the wind wheel and the blade pitch angle.
The invention provides a simulation test method for a flow field of a wind driven generator, which comprises the following steps:
constructing and based on a three-dimensional flow field model of a wind driven generator, performing transient fluid dynamics simulation on the wind driven generator at the current moment, and acquiring simulation data of the wind driven generator and the three-dimensional flow field model at the current moment;
acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator;
updating the rotating speed of a reference coordinate system of a revolution region in the three-dimensional flow field model and the rotating speed of grid nodes of a self-rotation region in the three-dimensional flow field model based on the simulation control parameters;
wherein the three-dimensional flow field model comprises: a rotation zone, a revolution zone and a static zone; the autorotation area circumferentially extends along the direction of a variable pitch axis of a blade in the wind driven generator, and the radius of the autorotation area is larger than the maximum distance between the surface of the blade and the variable pitch axis of the blade; the revolution area and the static area circumferentially extend along the direction of the rotation axis of a wind wheel in the wind driven generator, the radius of the revolution area is larger than the length of the blade, and the static area is nested outside the revolution area.
According to the simulation test method for the flow field of the wind driven generator, provided by the invention, the revolution region in the three-dimensional flow field model is established based on a multiple reference system model, the space coordinates of grid nodes in the revolution region are fixed, and the multiple reference system model is used for increasing the relative rotating speed for the revolution region.
According to the wind driven generator flow field simulation test method provided by the invention, the autorotation area in the three-dimensional flow field model is established based on the slippage grid model, the grid nodes can rotate around the central axis of the autorotation area, and the slippage grid model is used for changing the positions of the grid nodes and the boundary of the three-dimensional flow field model so as to simulate the flow field change of the blades during pitch variation.
According to the simulation test method for the flow field of the wind driven generator, provided by the invention, in the three-dimensional flow field model, the surface of the blade is provided with a boundary layer grid, and the thickness of the first layer of the boundary layer grid meets a preset condition; the public area and the static area adopt a contact mode of a common grid node; the data transmission between the self-transfer area and the public transfer area is realized through an interface of a non-shared node; the grid size of the revolution area is larger than that of the rotation area.
According to the simulation test method for the flow field of the wind driven generator, provided by the invention, the autorotation area is a cylinder; the central axis of the autorotation area is superposed with the variable pitch axis of the blade; the distance between one end of the autorotation area and the rotation center of the wind power is a preset value; a radius of the autorotation region determined based on a maximum distance between the blade surface and a pitch axis of the blade; the length of the autorotation zone is determined based on the length of the blade.
According to the simulation test method for the flow field of the wind driven generator, provided by the invention, the revolution area is a cylinder, the central axis of the revolution area is superposed with the rotating shaft of the wind wheel, and the rotating center of the wind wheel is superposed with the middle point of the central axis of the revolution area; the radius of the revolution region is determined based on the length of the autorotation region; the length of the revolution region is determined based on the radius of the autorotation region.
According to the simulation test method for the flow field of the wind driven generator, provided by the invention, the static area is an annular cylinder; the central axis of the static area is superposed with the rotating shaft of the wind wheel; the outer diameter of the quiet zone is determined based on the radius of the revolution zone; the distance between the inlet boundary of the static area and the wind wheel set in the wind driven generator and the distance between the outlet boundary of the static area and the wind wheel set are determined based on the radius of the autorotation area.
According to the simulation test method for the flow field of the wind driven generator, provided by the invention, the three-dimensional flow field model is formed by three-dimensional flow field models of all blades; the boundary of the three-dimensional flow field model of any blade is a periodic symmetric boundary.
The invention also provides a simulation test device for the wind driven generator, which comprises:
the data acquisition module is used for constructing and based on a three-dimensional flow field model of the wind driven generator, performing transient fluid dynamics simulation on the wind driven generator at the current moment, and acquiring simulation data of the wind driven generator and the three-dimensional flow field model at the current moment;
the data calculation module is used for acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator;
the simulation control module is used for updating the reference coordinate system rotating speed of a revolution region in the three-dimensional flow field model and the grid node rotating speed of a self-rotation region in the three-dimensional flow field model based on the simulation control parameters;
wherein the three-dimensional flow field model comprises: a rotation zone, a revolution zone and a static zone; the autorotation area circumferentially extends along the direction of a variable pitch axis of a blade in the wind driven generator, and the radius of the autorotation area is larger than the maximum distance between the surface of the blade and the variable pitch axis of the blade; the revolution area and the static area circumferentially extend along the direction of the rotation axis of a wind wheel in the wind driven generator, the radius of the revolution area is larger than the length of the blade, and the static area is nested outside the revolution area.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the wind driven generator flow field simulation test method is realized.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a wind turbine flow field simulation test method as described in any of the above.
The invention provides a method and a device for simulating and testing a flow field of a wind driven generator, which are used for simulating transient fluid dynamics of the wind driven generator at the current moment based on a three-dimensional flow field model of the wind driven generator, acquiring simulation data of the wind driven generator and the three-dimensional flow field model at the current moment, acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and a control strategy of the wind driven generator, updating the rotating speed of a reference coordinate system of a revolution area in the three-dimensional flow field model and the rotating speed of grid nodes of a autorotation area in the three-dimensional flow field model based on the simulation control parameters, performing unsteady computational fluid dynamics analysis on the speed change of a wind wheel and the pitch change process of blades in the running state of the wind driven generator, considering the speed change and pitch change actions of the wind driven generator, and enabling the calculation result of the acquired transient flow field to be closer to the actual situation, the method has the advantages that more accurate simulation test results can be obtained, the method has important significance for improving the efficiency, reliability, correctness and uniformity of design and implementation of the wind driven generator, when steady state simulation calculation is carried out on the wind driven generator flow field under different blade pitch angles, the blades are positioned at the target blade pitch angles by controlling the rotation of the autorotation area, and the time cost of flow field calculation pretreatment can be effectively reduced.
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In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a simulation test method for a flow field of a wind turbine generator according to the present invention;
FIG. 2 is a cross-sectional view of a three-dimensional flow field model of a blade in the method for simulation testing of a flow field of a wind turbine provided by the present invention;
FIG. 3 is a front view of a three-dimensional flow field model of a blade in the method for simulating and testing the flow field of a wind turbine generator provided by the invention;
FIG. 4 is a left side view of a three-dimensional flow field model of a blade in the method for simulating and testing the flow field of a wind turbine generator according to the present invention;
FIG. 5 is a second schematic flow chart of a simulation testing method for a flow field of a wind turbine generator according to the present invention;
FIG. 6 is a schematic structural diagram of a simulation testing apparatus for wind turbine generators according to the present invention;
fig. 7 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that, when the wind turbine is subjected to the simulation test based on the traditional wind turbine flow field simulation test method, the flow field where the wind turbine is located can be simulated through steady state calculation under the condition that the rotation speed of the wind wheel and the pitch angle of the blade in the wind turbine are constant. However, in the traditional wind turbine generator flow field simulation test method, it is difficult to accurately simulate the flow field change of the wind turbine generator and reasonably predict the aerodynamic performance of the wind turbine during the dynamic change of the wind turbine rotation speed and the blade pitch angle. In addition, in the conventional wind turbine flow field simulation test method, in steady-state analysis, if the flow fields under a plurality of pitch angles are calculated, the pitch angles of the blades need to be adjusted again, and then new flow fields are subjected to grid division, so that the time cost of preprocessing is high.
Therefore, the invention provides a method and a device for simulating and testing a flow field of a wind driven generator. Based on the wind driven generator flow field simulation test method provided by the invention, the flow field change of the wind driven generator can be simulated in the process of dynamic change of the wind wheel rotating speed and/or the blade pitch angle in the wind driven generator, so that the simulation test result of the wind driven generator can be more accurately obtained, and the method has important significance for improving the high efficiency, reliability, correctness and uniformity of pneumatic design and implementation of the wind driven generator.
Fig. 1 is one of the flow diagrams of the simulation test method for the flow field of the wind turbine provided by the present invention. The flow field simulation test method of the wind driven generator of the present invention is described below with reference to fig. 1. As shown in fig. 1, the method includes: step 101, constructing and based on a three-dimensional flow field model of the wind driven generator, performing transient fluid dynamics simulation on the wind driven generator at the current moment, and acquiring simulation data of the wind driven generator at the current moment.
Wherein, three-dimensional flow field model includes: a rotation zone, a revolution zone and a static zone; the autorotation area circumferentially extends along the direction of a variable pitch axis of a blade in the wind driven generator, and the radius of the autorotation area is greater than the maximum distance between the surface of the blade and the variable pitch axis of the blade; the revolution area and the static area circumferentially extend along the direction of the rotation axis of a wind wheel in the wind driven generator, and the static area is nested outside the revolution area; the radius of the revolution area is larger than the length of the blade;
simulation data, comprising: the three-dimensional flow field model comprises wind speed distribution, pneumatic torque of a wind wheel, wind wheel rotating speed, blade pitch angle and motor torque.
Simulating control parameters, including: the rotating speed of the wind wheel, the variable pitch speed of the blades, the rotating speed of the revolution area reference coordinate system and the rotating speed of the grid nodes of the rotation area. Wherein the positive and negative of the rotation speed may indicate a rotation direction of the mesh node.
In particular, computational fluid dynamics methods are the product of a combination of fluid mechanics, numerical mathematics and computer science. The computational fluid dynamics method can obtain numerical solutions at discrete time/space points by approximately expressing integral and differential terms in a fluid mechanics control equation as discrete algebraic forms to form algebraic equation sets and then solving the discrete algebraic equation sets through a computer.
FIG. 2 is a cross-sectional view of a three-dimensional flow field model of a blade in the wind turbine flow field simulation test method provided by the invention. FIG. 3 is a front view of a three-dimensional flow field model of a blade in the method for simulating and testing the flow field of a wind turbine generator provided by the invention. FIG. 4 is a left side view of a three-dimensional flow field model of a blade in the wind turbine flow field simulation test method provided by the present invention.
Based on the content of each embodiment, the three-dimensional flow field model is formed by three-dimensional flow field models of each blade; the boundary of the three-dimensional flow field model of any blade is a periodic symmetric boundary.
Fig. 2 to 4 show a three-dimensional flow field model of any blade 1 of the wind turbine. The three-dimensional flow field model of the blade 1 comprises a rotation area 2, a revolution area 3 and a static area 4. And combining the three-dimensional flow field models of the blades 1 to obtain the three-dimensional flow field model of the wind driven generator.
The three-dimensional flow field model of the wind driven generator can be constructed based on the structural parameters of the wind driven generator. The modeling of a turbulent flow field can be carried out based on a k-omega SST model or a Transition SST model, the pressure-velocity coupling can be carried out based on a Coupled algorithm, and the space difference value of a convection term can adopt a numerical format meeting the second-order precision. Wherein the k-omega SST model and the Transition SST model are widely used turbulence models.
It should be noted that, because the distribution of the blades in the wind turbine has periodicity and symmetry, when creating the three-dimensional flow field model of the wind turbine, only the three-dimensional flow field model of any blade 1 in the wind turbine may be created, and the three-dimensional flow field model of the wind turbine may be obtained by using the periodicity and symmetry of the distribution of the blades 1. In the three-dimensional flow field model of the blade 1, periodic symmetric boundaries are arranged on two sides of the flow field, and the number of grids in the three-dimensional flow field model can be reduced to one third of that of a three-dimensional flow field model simulating a wind wheel in the whole wind driven generator by the periodic symmetric boundaries.
The inlet of the three-dimensional flow field model of the wind driven generator can adopt a speed boundary condition, and the outlet can adopt a pressure boundary condition.
Each blade 1 in the wind turbine corresponds to a turning area 2. The spinning zone 2 extends circumferentially in the direction of the pitch axis of the blade 1, so that the blade 1 is completely wrapped by the spinning zone 2.
It should be noted that, when no autorotation region is set in the three-dimensional flow field model of the wind turbine, for the case of different pitch angles, it is necessary to adjust the pitch angle of the blade multiple times and perform multiple grid division on the flow field. In the embodiment of the invention, the autorotation area of the three-dimensional flow field model can directly rotate the meshes of the autorotation area in the blade pitch changing process, and the whole flow field model does not need to be subjected to mesh division.
It should be noted that in the embodiment of the present invention, the grid nodes of the autorotation area 2 can rotate, and the rotation speed of the grid nodes is related to the pitch angle of the blades of the wind turbine. Based on the blade pitch angle of the wind driven generator, the rotating speed of the grid node can be controlled, so that the flow field change of the wind driven generator can be simulated in the dynamic change process of the blade pitch angle in the simulation test process of the wind driven generator.
Note that the mesh nodes in the rotation region 2 include mesh nodes on the blade wall surface.
The revolution zone 3 extends circumferentially in the direction of the rotational axis of the wind turbine in the wind turbine such that the rotation zone 2 is completely wrapped by the revolution zone 3.
The stationary zone 4 is nested outside the common zone 3 and extends circumferentially in the direction of the axis of rotation of the rotor in the wind turbine such that the common zone 3 is completely surrounded by the stationary zone 4.
Typically, the number of blades in a wind turbine is 3. The following describes the simulation test method for the flow field of the wind driven generator, which is provided by the invention, by taking the number of the blades 1 in the wind driven generator as an example.
As shown in fig. 2 to 4, in the three-dimensional flow field model of the blade 1 in the wind turbine, the stationary zone 4 and the revolving zone 3 corresponding to the blade 1 have fan-shaped cross sections. The circle center of the fan shape is the rotation center of a wind wheel in the wind driven generator, and the central angle of the fan shape is 360 degrees/the number of the blades. In the case where the number of blades in the wind power generator is 3, the central angles of the sectors are all 120 °.
When the wind driven generator is subjected to hydrodynamic simulation, the wind speed data of the incoming flow of the wind driven generator can be set according to the simulation requirement. The wind speed data can be time sequence data which is monotonically increased, time sequence data which is monotonically decreased, pulsation time sequence data which meets a turbulent wind spectrum or time sequence data which meets a specific function.
Optionally, Fluent software may be adopted in the embodiment of the present invention to perform a hydrodynamic simulation on the wind turbine.
Under the condition that the wind speed data of the incoming flow of the wind driven generator is the pulse time sequence data meeting the turbulent flow wind spectrum, the change of the wind speed along with the time can be simulated by adopting the profile file function of Fluent software, namely, the wind speed of the inlet boundary of the flow field at different times can be defined according to the data in the profile file.
In the case that the wind speed data of the incoming flow of the wind driven generator is time sequence data meeting a specific function, the wind speeds of the inlet boundary of the flow field at different times can be defined through a DEFINE _ PROFILE macro in a secondary development module (UDF) of Fluent software.
In the process of carrying out fluid dynamics simulation on the wind driven generator based on the three-dimensional flow field model of the wind driven generator, the wind speed of the inlet boundary of the three-dimensional flow field model at the current moment can be obtained by the method.
And 102, acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator.
Specifically, based on the wind speed, the aerodynamic torque of the wind wheel, the rotational speed of the wind wheel (equal to the rotational speed of the reference coordinate system in the revolution region) at the current moment in the three-dimensional flow field model of the wind turbine generator, and the pitch angle of the blade, a computational fluid dynamics method can be adopted, and according to the control strategy of the wind turbine generator, a corresponding wind wheel rotational speed control algorithm is executed to perform transient numerical calculation, so that the wind wheel rotational speed and the pitch speed of the blade at the next moment of the wind turbine generator are obtained.
According to the aerodynamic torque and the wind wheel rotating speed of the wind wheel at the current moment, the output power of the wind wheel at the current moment can be obtained through calculation; according to the wind speed, the output power of the wind wheel, the rotating speed of the wind wheel and the blade pitch angle in the three-dimensional flow field model at the current moment, the motor torque at the current moment can be calculated and obtained based on a control algorithm; according to the pneumatic torque of the wind wheel at the current moment, the motor torque and the rotational inertia of the blades (inherent attributes of the blades), the rotating acceleration of the wind wheel at the current moment can be obtained through calculation; and calculating the wind wheel rotating speed of the wind driven generator at the next moment according to the interval duration between the current moment and the next moment, the wind wheel rotating speed at the current moment and the acceleration of the wind wheel.
And calculating the variable pitch speed of the blade at the next moment according to the interval duration between the current moment and the next moment, the blade pitch angle at the current moment and the variable pitch acceleration of the blade.
It should be noted that the rotational speed of the wind wheel at the next moment of the wind turbine generator may be the same as or different from the rotational speed of the wind wheel at the current moment of the wind turbine generator. The pitch speed of the wind driven generator at the next moment can be the same as or different from the pitch speed of the wind driven generator at the current moment.
It should be noted that the control strategy of the wind turbine may include, but is not limited to, the critical wind speed at which the wind turbine starts pitching. The control strategy of the wind turbine may be predetermined based on a priori knowledge. The control strategy of the wind turbine generator in the embodiment of the invention is not particularly limited.
And 103, updating the reference coordinate system rotating speed of the revolution region in the three-dimensional flow field model and the grid node rotating speed of the autorotation region in the three-dimensional flow field model based on the simulation control parameters.
Specifically, based on the wind wheel rotation speed of the wind turbine at the next moment, the reference coordinate system rotation speed of the next-moment revolution area 3 may be obtained, and the reference coordinate system rotation speed of the next-moment revolution area 3 may be updated.
Based on the variable pitch speed of the blades of the wind driven generator at the next moment, the grid node rotating speed of the self-rotating area 2 can be obtained, and the grid node rotating speed of the self-rotating area 2 at the next moment can be updated.
The flow field simulation test method of the wind driven generator provided by the invention is described by an example.
Setting the wind speed in the three-dimensional flow field model at the initial simulation moment to be 5m/s, and determining the change of the wind speed in the three-dimensional flow field model by a randomly generated time sequence data in the simulation process. And setting the rotating speed of the wind wheel at the initial simulation moment to be 3rpm and setting the blade pitch angle to be 0 degree. Wherein the blade is fully deployed with a blade pitch angle of 0 °.
Based on the three-dimensional flow field model of the wind driven generator, transient fluid dynamics simulation of the wind driven generator at the current moment is carried out, and the wind speed, the torque borne by each blade, the rotating speed of a wind wheel and the blade pitch angle in the three-dimensional flow field model at the current moment can be obtained. The sum of the torques applied to each blade at the current moment is further obtained, and the aerodynamic torque of the wind wheel at the current moment can be obtained.
And calculating to obtain the output power of the wind wheel at the current moment according to the aerodynamic torque and the rotating speed of the wind wheel at the current moment.
According to the output power of the wind wheel, the rotating speed of the wind wheel and the pitch angle of the blade at the current moment, the motor torque and the pitch acceleration of the blade at the current moment can be calculated and obtained based on a control algorithm.
And calculating the rotation acceleration of the wind wheel at the current moment according to the aerodynamic torque of the wind wheel, the motor torque and the rotational inertia of the blades at the current moment.
And calculating to obtain the rotating speed of the wind wheel at the next moment according to the interval duration between the current moment and the next moment, the rotating speed of the wind wheel at the current moment and the rotating acceleration of the wind wheel.
And calculating the variable pitch speed of the blade at the next moment according to the interval duration between the current moment and the next moment, the blade pitch angle at the current moment and the variable pitch acceleration of the blade.
And updating the rotating speed of the reference coordinate system of the revolution area according to the rotating speed of the wind wheel at the next moment, and updating the rotating speed of the grid nodes of the autorotation area according to the variable pitch speed of the blades at the next moment so as to enable the blades to rotate to the pitch angle of the blades at the next moment.
The embodiment of the invention carries out transient fluid dynamics simulation on the wind driven generator at the current moment by constructing and based on the three-dimensional flow field model of the wind driven generator, obtains the simulation data of the wind driven generator and the three-dimensional flow field model at the current moment, obtains the simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator, updates the rotating speed of a reference coordinate system of a revolution region in the three-dimensional flow field model and the rotating speed of a grid node of a self-rotating region in the three-dimensional flow field model based on the simulation control parameters, can carry out unsteady state calculation fluid dynamics analysis on the variable speed and variable pitch process of a wind wheel and blades in the running state of the wind driven generator, takes the variable speed and variable pitch action of the wind driven generator into consideration in the simulation, obtains the transient flow field calculation result which is closer to the actual situation, and can obtain a more accurate simulation test result, the method has important significance for improving the efficiency, reliability, correctness and uniformity of design and implementation of the wind driven generator, and can effectively reduce the time cost of flow field calculation pretreatment by controlling the rotation of the autorotation region to enable the blades to be positioned at the target blade pitch angle when the steady state simulation calculation is carried out on the wind driven generator flow field under different blade pitch angles.
Based on the content of the above embodiments, the method includes: the revolution area in the three-dimensional flow field model is established based on a multiple reference system model, the space coordinates of grid nodes in the revolution area are fixed, and the multiple reference system model is used for increasing the relative rotating speed for the revolution area.
In particular, the three-dimensional flow field model may be constructed based on a cartesian coordinate system.
The multiple coordinate system model (MRF model) is a steady calculation model, wherein the grid unit is assumed to move at a constant speed in the model, and the method is suitable for the problem that the relative motion of each point on the boundary of the grid area is basically the same. Most of the time average flow can be calculated by using an MRF model, particularly when the interaction between a moving grid area and a static grid area is weak, the MRF model can be used for calculating, such as the calculation of a flow field in a stirrer, the calculation of a flow field in a pump and a fan, and the like. The MRF model has another purpose of providing an initial flow field for the calculation of the sliding grid model, namely, the MRF model is used for roughly calculating the initial flow field, and then the sliding grid model is used for completing the whole calculation.
It should be noted that, by adding the rotation speed component to the reference coordinate system of the revolution region 3 through the MRF model, the flow field change caused by the rotation motion of the wind wheel can be equivalently simulated. By changing the rotating speed of the MRF model, the simulation of the flow field near the wind wheel in the rotating speed changing process of the wind wheel can be realized. The rotational speed of the rotor is related to the aerodynamic torque of the rotor, the motor torque, and the moment of inertia of the blades (inherent properties of the blades).
In the embodiment of the invention, the MRF model is adopted to add a rotation speed component to the reference coordinate system of the revolution area 3, and the rotation flow field near the whole wind wheel in the wind driven generator can be simulated in the process of dynamic change of the rotation speed of the wind wheel in the wind driven generator by matching with the periodic symmetric boundary.
Based on the content of each embodiment, the rotation region in the three-dimensional flow field model is established based on a slip grid model, the grid nodes can rotate around the central axis of the rotation region, and the slip grid model is used for changing the positions of the grid nodes and the boundary of the three-dimensional flow field model so as to simulate the flow field change when the blades change the pitch.
Specifically, in the sliding grid model, in the calculation process, the mobile unit area slides along the grid interface, and the grid in the mobile grid area is kept unchanged. The characteristic enables the sliding grid model to have great advantages in numerical simulation when problems related to a rotating area exist.
In the embodiment of the invention, the slippage grid model is adopted to model the rotation of the grid nodes in the rotation area 2, so that the grid nodes in the rotation area 2 can be controlled to move based on the slippage grid model after the rotation speed of the grid nodes in the rotation area 2 at the next moment is obtained, and the grid nodes rotate around the variable pitch axis of the blades wrapped in the rotation area 2 according to the rotation speed, so that the rotating flow field near each blade in the wind driven generator can be simulated in the process of dynamic change of the blade pitch angle in the wind driven generator.
Fig. 5 is a second schematic flow chart of the wind turbine generator flow field simulation test method provided by the present invention. The implementation process of the wind driven generator flow field simulation test method provided by the invention in Fluent software is shown in fig. 5.
A solver in the Fluent software is secondarily developed through a plurality of secondary development modules (UDFs) of the Fluent software, and a wind speed function of a flow field inlet can be realized through the UDF module mainly comprising DEFINE _ PROFILE macro.
After the numerical iteration of the current Moment is completed, acquiring the instantaneous simulation data of the wind driven generator at the current Moment, transmitting the instantaneous simulation data of the wind driven generator at the current Moment to the UDF taking the DEFINE _ ADJUST macro as a main body, extracting the aerodynamic load of the blade by adopting the computer _ Force _ And _ Moment macro, And calculating the torque And the output power of the wind wheel. By judging whether the wind driven generator reaches the rated rotating speed and exceeds the rated power, a corresponding wind wheel rotating speed and blade pitch angle control algorithm can be executed according to the control strategy of the wind driven generator, and the wind wheel rotating speed and the blade pitch angle of the wind driven generator at the next moment are determined.
The rotation speed of the slip mesh model of the rotation ZONE 2 and the rotation speed of the MRF multiple reference system model of the revolution ZONE 3 are adjusted by the DEFINE _ ZONE _ movement macro.
As the simulation time advances, the above calculation process is repeated when the next time becomes the current time.
Based on the content of each embodiment, in the three-dimensional flow field model, boundary layer grids are arranged on the surface of the blade, and the thickness of the first layer of boundary layer grids meets a preset condition; the public transfer area and the static area adopt a contact mode of sharing grid nodes; the rotation area and the revolution area realize data transmission through an interface of an unshared node; the grid size of the revolution area is larger than that of the rotation area.
Specifically, in the spatial discretization of the three-dimensional flow field model of the wind driven generator, boundary layer grids need to be arranged on the surface of the blade 1, and the thickness of the first layer of the boundary layer grids meets preset conditions.
Optionally, in consideration of the effect of the transition effect, the preset condition may include: and determining the thickness of the first layer boundary layer grid by taking Y + less than 1 as a target. Wherein, Y + is a basic index used in the art to determine whether the grid thickness is suitable.
The revolution region 3 and the static region 4 can adopt a contact mode of common grid nodes, and the rotation region 2 and the revolution region 3 realize data transmission through an interface of non-common nodes.
When the grid division is carried out on the three-dimensional flow field model of the wind driven generator, the distribution condition of Reynolds number (Re number) along the spanwise direction of the blade can be firstly calculated according to parameters such as the rotating speed, the chord length, the wind speed, the air density and the dynamic viscosity of a wind wheel; secondly, determining the thickness of the first layer boundary layer grid by taking Y + less than 1 as a target, and calculating the thickness of the first layer wall surface grid; and thirdly, generating 15-20 layers of boundary layer grids by an increasing factor of 1.05.
The rotation area 2 adopts a structured grid generation mode (for example, the rotation area can be divided by using an O-block in ICEM software), grid nodes in the rotation area 2 do not correspond to the revolution area 3, but the grid area ratio of two sides of the interface of the rotation area 2 and the revolution area 3 is ensured to be less than 4.
The stationary zone 4 may share a mesh node with the revolution zone 3. The static zone 4 and the revolution zone 3 adopt unstructured grids.
The mesh size of the stationary zone 4 and the revolving zone 3 is larger than that of the revolving zone 2.
In the three-dimensional flow field model in the embodiment of the invention, the surface of the blade is provided with the boundary layer grids, the thickness of the first layer of boundary layer grids meets the preset condition, the revolution region and the static region adopt a contact mode of shared grid nodes, data transmission is realized between the rotation region and the revolution region through an interface of an unshared node, the grid size of the revolution region is larger than that of the rotation region, and the flow field change of the wind driven generator can be simulated more accurately in the process of dynamic change of the rotating speed of a wind wheel and/or the pitch angle of the blade in the wind driven generator.
Based on the content of the above embodiments, the autorotation area is a cylinder; the central axis of the autorotation area is superposed with the variable pitch axis of the blade; the distance between one end of the autorotation area and the rotation center of the wind wheel is a preset value; a radius of the autorotation zone determined based on a maximum distance between the blade surface and a pitch axis of the blade; the length of the autorotation zone is determined based on the length of the blade.
Specifically, as shown in fig. 2 to 4, the rotation region 2 is a cylinder, and a central axis of the rotation region 2 coincides with a pitch axis of the blade 1.
The autorotation area 2 is provided with two ends, wherein the distance between one end of the autorotation area and the rotating center of the wind wheel of the wind driven generator is a preset value.
Optionally, the preset value may range from 4 to 8 centimeters, for example: the value of the preset value may be 4 cm, 6 cm or 8 cm.
Radius r of autorotation area 2 1 I.e. the radius of the bottom surface of the cylinder as described above, may be determined based on the maximum distance between the surface of the blade 1 and the pitch axis of the blade 1.
Alternatively, the radius r of the rotation zone 2 1 May be 1 to 2 times the maximum distance, e.g.Radius r of rotation zone 2 1 May be 1, 1.5 or 2 times the maximum distance.
Preferably, the radius r of the rotation zone 2 1 May be 1.5 times the maximum distance.
Length h of autorotation zone 2 1 I.e. the height of the cylinder, can be determined on the basis of the length h of the blade 1.
Alternatively, the length h of the spin zone 2 1 May be 0.5 to 1 meter longer than the length h of the blade 1, for example: length h of autorotation zone 2 1 May be 0.5 m, 0.75 m or 1 m longer than the length h of the blade 1.
In the embodiment of the invention, the autorotation area is a cylinder, the central axis of the autorotation area is coincident with the variable pitch axis of the blade, one end of the autorotation area is positioned at the rotation center of the wind wheel, the radius of the autorotation area is determined based on the maximum distance between the surface of the blade and the variable pitch axis of the blade, and the length of the autorotation area is determined based on the length of the blade, so that the rotating flow field near each blade of the wind driven generator can be more accurately simulated in the process of dynamic change of the blade pitch angle of the wind driven generator.
Based on the content of each embodiment, the revolution area is a cylinder, the central axis of the revolution area coincides with the rotation axis of the wind wheel, and the rotation center of the wind wheel coincides with the middle point of the central axis of the revolution area; the radius of the revolution region is determined based on the length of the autorotation region; the length of the revolution region is determined based on the radius of the autorotation region.
Specifically, as shown in fig. 2 to 4, the revolution zone 3 is a cylinder, and a central axis of the revolution zone 3 coincides with a rotation axis of a wind wheel in the wind turbine, and a rotation center of the wind wheel coincides with a middle point of the central axis of the revolution zone 3.
Radius r of the revolution region 3 2 I.e. the radius of the bottom surface of the cylinder, can be based on the length h of the spinning field 2 1 And (4) determining.
Alternatively, the radius r of the revolution zone 3 2 May be the length h of the spinning zone 2 1 1.05 to 1.1 times, e.g. radius r of revolution area 3 2 May be the length h of the spinning zone 2 1 1.05 times, 1.075 times or 1.1 times.
Length h of revolution area 3 2 I.e. the height of the cylinder, can be based on the radius r of the spinning field 2 1 And (4) determining.
Optionally, the length h of the revolution zone 3 2 May be the radius r of the autorotation area 2 1 3 to 4 times of, for example: length h of revolution area 3 2 May be the radius r of the autorotation area 2 1 3 times, 2.5 times, or 4 times.
In the embodiment of the invention, the revolution area is a cylinder, the central axis of the revolution area is coincident with the rotation axis of the wind wheel, the rotation center of the wind wheel is coincident with the middle point of the central axis of the revolution area, the radius of the revolution area is determined based on the length of the revolution area, and the length of the revolution area is determined based on the radius of the revolution area, so that the rotation flow field of the whole wind wheel in the wind driven generator can be simulated more accurately in the process of dynamic change of the rotation speed of the wind wheel in the wind driven generator.
Based on the content of the above embodiments, the static area is a circular column; the central axis of the static area is superposed with the rotation axis of the wind wheel; the outer diameter of the static area is determined based on the radius of the revolution area; the distance between the inlet boundary of the static area and the wind wheel set in the wind driven generator and the distance between the outlet boundary of the static area and the wind wheel set are determined based on the radius of the autorotation area.
Specifically, as shown in fig. 2 to 4, the stationary zone 4 is nested outside the revolution zone 3, the stationary zone 4 is a ring cylinder, and the central axis of the stationary zone 4 coincides with the rotation axis of the wind turbine.
Inner diameter r of the quiescent zone 4 3 Is the radius r of the revolution zone 3 2 。
Outer diameter r of the quiescent zone 4 4 Can be based on the radius r of the revolution area 3 2 And (4) determining.
Optionally, the outer diameter r of the quiescent zone 4 4 May be the radius r of the revolution area 3 2 1.5 to 2 times higher, for example: outer diameter r of the quiescent zone 4 4 May be the radius r of the revolution area 3 2 1.5 times, 1.75 times or 2 times.
The inlet boundary of the quiescent zone 4 is the one of the two circular faces in the cylinder through which the incoming flow first passes. The outlet boundary of the quiescent zone 4 is the circular surface of the two circular surfaces of the cylinder through which the incoming stream passes.
Distance h between inlet boundary of static area 4 and wind wheel set 3 Can be based on the radius r of the autorotation area 2 1 And (4) determining.
Optionally, the distance h between the inlet boundary of the quiet zone 4 and the set of wind wheels 3 Is required to be larger than the radius r of the autorotation area 2 1 8 to 12 times, for example: distance h between inlet boundary of static area 4 and wind wheel set 3 Is required to be larger than the radius r of the autorotation area 2 1 8 times, 10 times or 12 times of the total amount of the active ingredient.
Preferably, the distance h between the inlet boundary of the dead zone 4 and the set of wind wheels 3 Is required to be larger than the radius r of the autorotation area 2 1 10 times higher than the original value.
Distance h between the outlet boundary of the rest zone 4 and the wind wheel set 4 Or based on the radius r of the spinning region 2 1 And (4) determining.
Optionally, the distance h between the outlet boundary of the quiescent zone 4 and the set of wind wheels 4 And is required to be larger than the radius r of the autorotation area 2 1 18 to 22 times, for example: distance h between the outlet boundary of the stationary zone 4 and the wind wheel set 4 Is required to be larger than the radius r of the autorotation area 2 1 18 times, 20 times or 22 times.
Preferably, the outlet boundary of the quiescent zone 4 is at a distance h from the set of wind wheels 4 And is required to be larger than the radius r of the autorotation area 2 1 20 times of the total weight of the powder.
In the embodiment of the invention, the static area is a ring cylinder, the central axis of the static area is coincident with the rotation axis of the wind wheel, the outer diameter of the static area is determined based on the radius of the revolution area, the distance between the inlet boundary of the static area and the wind wheel set and the distance between the outlet boundary of the static area and the wind wheel set are determined based on the radius of the autorotation area, and the flow field change of the wind driven generator can be more accurately simulated in the process of dynamic change of the wind wheel rotation speed and the blade pitch angle in the wind driven generator.
FIG. 6 is a schematic structural diagram of a simulation testing apparatus for wind turbine generators according to the present invention. The wind power generator simulation test device provided by the present invention is described below with reference to fig. 6, and the wind power generator simulation test device described below and the wind power generator flow field simulation test method provided by the present invention described above may be referred to correspondingly. As shown in fig. 6, the apparatus includes: a data acquisition module 601, a data calculation module 602 and a simulation control module 603.
The data acquisition module 601 is configured to construct and perform transient fluid dynamics simulation on the wind turbine at the current time based on the three-dimensional flow field model of the wind turbine, and acquire simulation data of the wind turbine and the three-dimensional flow field model at the current time.
And the data calculation module 602 is configured to obtain a simulation control parameter of the wind turbine at the next time based on the simulation data and the control strategy of the wind turbine.
The simulation control module 603 is used for updating the rotating speed of a reference coordinate system of a revolution region in the three-dimensional flow field model and the rotating speed of a grid node of a self-rotation region in the three-dimensional flow field model based on simulation control parameters;
wherein, three-dimensional flow field model includes: a rotation zone, a revolution zone and a static zone; the autorotation area circumferentially extends along the direction of a variable pitch axis of a blade in the wind driven generator, and the radius of the autorotation area is greater than the maximum distance between the surface of the blade and the variable pitch axis of the blade; the revolution region and the static region extend circumferentially along the direction of the rotation axis of a wind wheel in the wind driven generator, the radius of the revolution region is larger than the length of the blade, and the static region is nested outside the revolution region.
Specifically, the data acquisition module 601, the data calculation module 602, and the simulation control module 603 are electrically connected.
In the process of performing fluid dynamics simulation on the wind driven generator based on the three-dimensional flow field model of the wind driven generator, the data acquisition module 601 may be configured to construct the three-dimensional flow field model, and acquire wind speed distribution, aerodynamic torque of a wind wheel, rotational speed of the wind wheel, pitch angle of blades, and torque of a motor in the three-dimensional flow field model.
The data calculation module 602 may be configured to perform transient numerical calculation based on the simulation data at the current time and the control strategy of the wind turbine generator and based on a computational fluid dynamics method, so as to obtain the motor torque at the next time of the wind turbine generator.
The simulation control module 603 may be configured to obtain a rotation speed of the reference coordinate system of the next-time turning zone 3 based on a motor torque of the wind turbine at a next time, and update the rotation speed of the reference coordinate system of the next-time turning zone 3. The simulation control module 603 may be configured to obtain a grid node rotation speed of the rotation region 2 at a next moment of the wind turbine, and update the grid node rotation speed of the rotation region 2 at the next moment.
Optionally, the wind turbine simulation testing device may further include a model building module.
The model building module may be used to build a three-dimensional flow field model.
The embodiment of the invention carries out transient fluid dynamics simulation on the wind driven generator at the current moment by constructing and based on the three-dimensional flow field model of the wind driven generator, obtains the simulation data of the wind driven generator and the three-dimensional flow field model at the current moment, obtains the simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator, updates the rotating speed of a reference coordinate system of a revolution region in the three-dimensional flow field model and the rotating speed of a grid node of a self-rotating region in the three-dimensional flow field model based on the simulation control parameters, can carry out unsteady state calculation fluid dynamics analysis on the variable speed and variable pitch process of a wind wheel and blades in the running state of the wind driven generator, takes the variable speed and variable pitch action of the wind driven generator into consideration in the simulation, obtains the transient flow field calculation result which is closer to the actual situation, and can obtain a more accurate simulation test result, the method has important significance for improving the efficiency, reliability, correctness and uniformity of design and implementation of the wind driven generator, and can effectively reduce the time cost of flow field calculation pretreatment by controlling the rotation of the autorotation region to enable the blades to be positioned at the target blade pitch angle when the steady state simulation calculation is carried out on the wind driven generator flow field under different blade pitch angles.
Fig. 7 illustrates a physical structure diagram of an electronic device, and as shown in fig. 7, the electronic device may include: a processor (processor)710, a communication Interface (Communications Interface)720, a memory (memory)730, and a communication bus 740, wherein the processor 710, the communication Interface 720, and the memory 730 communicate with each other via the communication bus 740. Processor 710 may invoke logic instructions in memory 730 to perform a wind turbine flow field simulation test method, the method comprising: constructing and based on a three-dimensional flow field model of the wind driven generator, performing transient fluid dynamics simulation on the wind driven generator at the current moment, and acquiring simulation data of the wind driven generator and the three-dimensional flow field model at the current moment; acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and a control strategy of the wind driven generator; updating the rotating speed of a reference coordinate system of a revolution region in the three-dimensional flow field model and the rotating speed of grid nodes of a rotation region in the three-dimensional flow field model based on the simulation control parameters; wherein, three-dimensional flow field model includes: a rotation zone, a revolution zone and a static zone; the autorotation area circumferentially extends along the direction of a variable pitch axis of a blade in the wind driven generator, and the radius of the autorotation area is greater than the maximum distance between the surface of the blade and the variable pitch axis of the blade; the revolution region and the static region extend circumferentially along the direction of the rotation axis of a wind wheel in the wind driven generator, the radius of the revolution region is larger than the length of the blade, and the static region is nested outside the revolution region.
In addition, the logic instructions in the memory 730 can be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform the wind turbine flow field simulation testing method provided by the above methods, the method comprising: constructing and based on a three-dimensional flow field model of the wind driven generator, performing transient fluid dynamics simulation on the wind driven generator at the current moment, and acquiring simulation data of the wind driven generator and the three-dimensional flow field model at the current moment; acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator; updating the rotating speed of a reference coordinate system of a revolution region in the three-dimensional flow field model and the rotating speed of grid nodes of a self-rotation region in the three-dimensional flow field model based on the simulation control parameters; wherein, three-dimensional flow field model includes: a rotation zone, a revolution zone and a static zone; the autorotation area circumferentially extends along the direction of a variable pitch axis of a blade in the wind driven generator, and the radius of the autorotation area is greater than the maximum distance between the surface of the blade and the variable pitch axis of the blade; the revolution region and the static region extend circumferentially along the direction of the rotation axis of a wind wheel in the wind driven generator, the radius of the revolution region is larger than the length of the blade, and the static region is nested outside the revolution region.
In yet another aspect, the present invention further provides a non-transitory computer readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to perform the wind turbine flow field simulation testing method provided in the above aspects, the method including: constructing and based on a three-dimensional flow field model of the wind driven generator, performing transient fluid dynamics simulation on the wind driven generator at the current moment, and acquiring simulation data of the wind driven generator and the three-dimensional flow field model at the current moment; acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator; updating the rotating speed of a reference coordinate system of a revolution region in the three-dimensional flow field model and the rotating speed of grid nodes of a self-rotation region in the three-dimensional flow field model based on the simulation control parameters; wherein, three-dimensional flow field model includes: a rotation zone, a revolution zone and a static zone; the autorotation area circumferentially extends along the direction of a variable pitch axis of a blade in the wind driven generator, and the radius of the autorotation area is greater than the maximum distance between the surface of the blade and the variable pitch axis of the blade; the revolution region and the static region extend circumferentially along the direction of the rotation axis of a wind wheel in the wind driven generator, the radius of the revolution region is larger than the length of the blade, and the static region is nested outside the revolution region.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (11)

1. A wind driven generator flow field simulation test method is characterized by comprising the following steps:
constructing and based on a three-dimensional flow field model of a wind driven generator, and performing transient fluid dynamics simulation on the wind driven generator at the current moment to obtain simulation data of the wind driven generator and the three-dimensional flow field model at the current moment;
acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator;
updating the reference coordinate system rotating speed of a revolution region in the three-dimensional flow field model and the grid node rotating speed of a self-rotation region in the three-dimensional flow field model based on the simulation control parameters;
wherein the three-dimensional flow field model comprises: a rotation zone, a revolution zone and a static zone; the autorotation area circumferentially extends along the direction of a variable pitch axis of a blade in the wind driven generator, and the radius of the autorotation area is larger than the maximum distance between the surface of the blade and the variable pitch axis of the blade; the revolution area and the static area circumferentially extend along the direction of the rotation axis of a wind wheel in the wind driven generator, the radius of the revolution area is larger than the length of the blade, and the static area is nested outside the revolution area.
2. The wind turbine flow field simulation test method according to claim 1, wherein a revolution zone in the three-dimensional flow field model is established based on a multiple reference system model, spatial coordinates of grid nodes in the revolution zone are fixed, and the multiple reference system model is used for increasing relative rotation speed for the revolution zone.
3. The wind driven generator flow field simulation test method according to claim 1, wherein the autorotation zone in the three-dimensional flow field model is established based on a slip grid model, the grid nodes can rotate around a central axis of the autorotation zone, and the slip grid model is used for changing positions of the grid nodes and a boundary of the three-dimensional flow field model so as to simulate the flow field change when the blade changes the pitch.
4. The wind driven generator flow field simulation test method according to claim 1, wherein in the three-dimensional flow field model, a boundary layer grid is arranged on the surface of the blade, and the thickness of the first layer of the boundary layer grid meets a preset condition; the public area and the static area adopt a contact mode of a common grid node; the data transmission between the self-transfer area and the public transfer area is realized through an interface of a non-shared node; the grid size of the revolution area is larger than that of the rotation area.
5. The wind driven generator flow field simulation test method according to claim 1, wherein the autorotation area is a cylinder; the central axis of the autorotation area is superposed with the variable pitch axis of the blade; the distance between one end of the autorotation area and the rotation center of the wind power is a preset value; a radius of the autorotation region determined based on a maximum distance between the blade surface and a pitch axis of the blade; the length of the autorotation zone is determined based on the length of the blade.
6. The wind driven generator flow field simulation test method according to claim 5, wherein the revolution area is a cylinder, a central axis of the revolution area coincides with a rotation axis of the wind wheel, and a rotation center of the wind wheel coincides with a midpoint of the central axis of the revolution area; the radius of the revolution region is determined based on the length of the autorotation region; the length of the revolution region is determined based on the radius of the autorotation region.
7. The wind driven generator flow field simulation test method according to claim 6, wherein the static area is an annular cylinder; the central axis of the static area is superposed with the rotating shaft of the wind wheel; the outer diameter of the quiet zone is determined based on the radius of the revolution zone; the distance between the inlet boundary of the static area and the wind wheel set in the wind driven generator and the distance between the outlet boundary of the static area and the wind wheel set are determined based on the radius of the autorotation area.
8. The wind turbine flow field simulation test method according to any one of claims 1 to 7, wherein the three-dimensional flow field model is composed of a three-dimensional flow field model of each blade; the boundary of the three-dimensional flow field model of any blade is a periodic symmetric boundary.
9. A wind driven generator simulation test device is characterized by comprising:
the data acquisition module is used for constructing and based on a three-dimensional flow field model of the wind driven generator, performing transient fluid dynamics simulation on the wind driven generator at the current moment, and acquiring simulation data of the wind driven generator and the three-dimensional flow field model at the current moment;
the data calculation module is used for acquiring simulation control parameters of the wind driven generator at the next moment based on the simulation data and the control strategy of the wind driven generator;
the simulation control module is used for updating the reference coordinate system rotating speed of a revolution region in the three-dimensional flow field model and the grid node rotating speed of a self-rotation region in the three-dimensional flow field model based on the simulation control parameters;
wherein the three-dimensional flow field model comprises: a rotation zone, a revolution zone and a static zone; the autorotation area circumferentially extends along the direction of a variable pitch axis of a blade in the wind driven generator, and the radius of the autorotation area is larger than the maximum distance between the surface of the blade and the variable pitch axis of the blade; the revolution area and the static area circumferentially extend along the direction of the rotation axis of a wind wheel in the wind driven generator, the radius of the revolution area is larger than the length of the blade, and the static area is nested outside the revolution area.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the wind turbine flow field simulation test method according to any one of claims 1 to 8 when executing the program.
11. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the steps of the wind turbine flow field simulation testing method according to any one of claims 1 to 8.
CN202210450098.5A 2022-04-26 2022-04-26 Wind driven generator flow field simulation test method and device Pending CN114997078A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200080912A1 (en) * 2018-09-04 2020-03-12 Deutsches Zentrum für Luft- und Raumfahrt e.V. Verfahren und Vorrichtung zum numerischen Messen mindestens einer strömungsbezogenen Eigenschaft
CN116070471A (en) * 2023-04-06 2023-05-05 浙江远算科技有限公司 Wind driven generator simulation acceleration method and system based on reduced order decomposition processing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200080912A1 (en) * 2018-09-04 2020-03-12 Deutsches Zentrum für Luft- und Raumfahrt e.V. Verfahren und Vorrichtung zum numerischen Messen mindestens einer strömungsbezogenen Eigenschaft
CN116070471A (en) * 2023-04-06 2023-05-05 浙江远算科技有限公司 Wind driven generator simulation acceleration method and system based on reduced order decomposition processing

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