CN103970937A - Design method for improving cavitation performance of centrifugal pump - Google Patents
Design method for improving cavitation performance of centrifugal pump Download PDFInfo
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- CN103970937A CN103970937A CN201410153429.4A CN201410153429A CN103970937A CN 103970937 A CN103970937 A CN 103970937A CN 201410153429 A CN201410153429 A CN 201410153429A CN 103970937 A CN103970937 A CN 103970937A
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Abstract
The invention discloses a design method for improving the cavitation performance of a centrifugal pump. The design method mainly comprises the steps that firstly, the specific speed of design working conditions of the centrifugal pump is solved, and geometric parameters of an impeller are calculated preliminarily; secondly, a test design method is adopted for designing multiple schemes of the impeller, and a CFturbo model is adopted; thirdly, the model is subjected to mesh division, CFX is adopted to conduct numerical simulation on the schemes, and the NPSH of the pump is calculated; fourthly, the main geometric parameters of the impeller serve as an input value, the NPSH of the pump serves as an output value, a Kriging model is adopted to establish an approximate response model, rapid calculation is conducted on the approximate response model in combination with the genetic algorithm, and then the optimal value is obtained. By means of the design method, the design requirement for the cavitation-resistant performance of the centrifugal pump can be met quickly, and design cost is reduced.
Description
Technical field
The present invention relates to rotating machinery cavitation design field, refer more particularly to a kind of centrifugal pump cavitation performance method for designing that improves.
Background technology
Pump in actual motion, owing to being subject to moving restriction and the improper use in place, easily in cavitation condition operation, in the time of impeller blade mouth place pressure lower than steam bubble saturated vapour pressure.Occur when cavitation, cause the series of problems such as change, vibration and noise of pump operation characteristic, when serious, can make pump impeller destroy, can not work.Therefore, to the cavitation performance of pump, the necessary net positive suction head of pump is designed with a very high request, is at present mainly based on experimental formula design impeller to the consideration of cavitation performance, the improvement of pump inlet and add other servicing units.
Through retrieval, the patent No. is that 201210574324.7 patent has proposed " efficient low cavitation is without overload design method for centrifugal pump impeller ", provide the hydraulic model geometric parameter blade exit back side laying angle of centrifugal pump impeller, blade exit workplace laying angle, the differential seat angle of blade two sides outlet laying angle, blade import back side laying angle, blade inlet working faces laying angle, the number of blade, subtended angle of blade, the span of Area Ratio.But, in patent, providing too many parameter, scope is also large, only has those veteran devisers within the scope of design parameter, to select suitable parameter.
The patent No. is that 201310241328.8 patent has proposed " a kind of vane pump cavitation numerical simulation automatic operation method based on ANSYS-CFX software ", adopt ANSYS-CFX software that vane pump non-cavitating numerical evaluation file is set, the initial modeling and the grid that comprise flow field regions are divided, boundary condition arranges, computation model is selected, and the condition of convergence is judged.Cavitation numerical value calculation document is set, comprises and add vapour phase physical property material, set import two phase component boundary conditions, set initial intake pressure boundary condition, select cavitation model.Adopt ANSYS-CFX software automatically to move the file of required suffix ccl by name.Foundation can realize the cavitation numerical simulation autoexec of operation automatically, and this file of double-click operation can be realized the automatic operation of vane pump cavitation numerical simulation.This patent has just provided a kind of method of fast vane pump cavitation performance being calculated.
In existing raising centrifugal pump cavitation performance equipment, method, major part is to rely on design experiences, and adopts Numeric simulation design method.Also do not adopt at present modern optimization method for designing to improve centrifugal pump cavitation performance and find topmost influence factor.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of centrifugal pump cavitation performance method for designing that improves, its technical scheme adopting is as follows:
A kind of centrifugal pump cavitation performance method for designing that improves, it comprises the steps:
Step 1: the design conditions of centrifugal pump are carried out to specific revolution calculating;
Step 2: the geometric parameter of centrifugal pump impeller is carried out to multi-scheme design;
Step 3: adopt CFturbo software to carry out flash mould to impeller, save as * .stp file, * .stp file is imported to ICEM software and carry out structured grid division, grid is * .cfx5 file, * .cfx5 is imported to the steady numerical simulation of carrying out design conditions in CFX and calculate and obtain cavitation of pump.
Step 4: using impeller main geometric parameters as input value, the necessary net positive suction head of pump is that output valve adopts Kriging model to set up the approximate model between fitting function coefficient and main geometric parameters.
NPSH
r＝f(D
1、β
1、s、b
1)；
And adopt the minimum value of genetic algorithm for solving response model;
Step 5: can carry out three-dimensional modeling according to impeller optimal value, and carry out numerical simulation, see and reach designing requirement, if reach designing requirement, can carry out verification experimental verification, if do not reach, repeating step two to four be until reach requirement.
In step 2, the method for multi-scheme design is that centrifugal pump spiral casing is constant, to impeller geometric parameter D
1, D
2, β
1, β
2,
s, b
1, b
2carry out Orthogonal Experiment and Design, analyze geometric parameter to cavitation performance influence degree, select the larger parameter [D of cavitation performance impact
1, β
1, s, b
1], then adopt Latin hypercube experimental design method, to parameter [D
1, β
1, s, b
1] carry out multi-scheme design.
The present invention adopts suitable grid and CFX to calculate, guarantee that numerical simulation and trial value approach, adopt test design method to carry out multi-scheme design to centrifugal pump, provide sufficient data for setting up approximate response model, and adopt genetic algorithm pairing approximation model to solve optimal value, reach designing requirement.Shorten the centrifugal pump the Hydraulic Design cycle, saved design cost.
Brief description of the drawings
Fig. 1 is the process flow diagram of the anti-cavitation performance method for designing of a kind of centrifugal pump.
Fig. 2 is the axis projection of design impeller.
Fig. 3 is the blade three-dimensional plot of design.
Embodiment
The object of the present invention is to provide a kind of anti-cavitation performance method for designing of centrifugal pump that improves, carry out optimizing by Combined Trials method for designing, Fluid Mechanics Computation (Computational Fluid Dynamics) CFD calculating, approximate response model and genetic algorithm, thereby obtain the centrifugal pump geometric parameter of one group of optimum, shorten the anti-cavitation performance design cycle of centrifugal pump.
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
Fig. 1 is invention thinking of the present invention, it is mainly to obtain initial geometric parameter based on traditional Hydraulic Design Method that the present invention improves centrifugal pump cavitation performance method for designing, adopt super latin square experiment method for designing to carry out multi-scheme design, adopt respectively CFturbo to carry out three-dimensional modeling to impeller, with ICEM, impeller is carried out to structured grid division, centrifugal pump is carried out numerical simulation and is obtained the necessary net positive suction head of corresponding scheme, data sample is made up of multiple schemes and corresponding result of calculation, and apply Kriging approximate model output valve and input value are set up to approximate function, carry out input value optimizing by genetic algorithm pairing approximation function.Finally, by experimental test, if test passes is optimized and finished, if defective, again geometric parameter is carried out to multi-scheme selection, form new data sample.
Improve cavitation performance with centrifugal pump herein and be designed to example.Below in conjunction with Fig. 2 and Fig. 3, the concrete implementation step of embodiment is as follows:
According to centrifugal pump design conditions Q
2=312m
3/ h, H
2=37.7m, rotation speed n=1490r/min;
In formula: n is rotating speed, the r/min of unit; Q is flow, the m of unit
3/ h; H is lift, the m of unit; n
s=105.
According to " modern times-pump theory and design " (Guan Xingfan. modern pump theory and design [M]. Chinese Yuhang Publishing House, 2011) centrifugal pump is designed, and calculate the initial geometric parameter of impeller.
The main geometric parameters impeller inlet diameter D of the impeller to centrifugal pump
1, impeller outlet diameter D
2, blade import laying angle β
1, blade exit laying angle β
2, cornerite
, blade import thickness s, blade entrance width b
1, blade exit width b
2, carrying out multi-scheme design, centrifugal pump spiral casing is constant, first impeller main geometric parameters is carried out to Orthogonal Experiment and Design, analyzes major parameter to performance impact degree, selects the parameter [D larger to performance impact
1, β
1, s, b
1], then adopt super latin square experiment method for designing to [D
1, β
1, s, b
1] carry out multi-scheme design;
Adopt CFturbo software to carry out flash mould to impeller, save as * .stp file, * .stp file is imported to ICEM software and carry out structured grid division, grid is * .cfx5 file, * .cfx5 is imported to the steady numerical simulation of carrying out design conditions in CFX and calculate and obtain cavitation of pump;
Using impeller main geometric parameters as input value, pump must net positive suction head NPSHr be output valve, adopts Kriging model to set up approximate model.
NPSH
r＝f(D
1、β
1、s、b
1);
And adopt the minimum value of genetic algorithm for solving response model.
Carry out three-dimensional modeling according to impeller optimal value, and carry out numerical simulation, see and can reach designing requirement, if reach designing requirement, can carry out verification experimental verification.If do not reach, need again carry out test design and rebuild approximate response model.
Claims (2)
1. a raising centrifugal pump cavitation performance method for designing, it comprises the steps:
Step 1: the design conditions of centrifugal pump are carried out to specific revolution calculating;
Step 2: the geometric parameter of centrifugal pump impeller is carried out to multi-scheme design;
Step 3: adopt CFturbo software to carry out flash mould to impeller, save as * .stp file, * .stp file is imported to ICEM software and carry out structured grid division, grid is * .cfx5 file, * .cfx5 is imported to the steady numerical simulation of carrying out design conditions in CFX and calculate and obtain cavitation of pump;
Step 4: using impeller main geometric parameters as input value, the necessary net positive suction head of pump is that output valve adopts Kriging model to set up the approximate model between fitting function coefficient and main geometric parameters;
NPSH
r＝f(D
1、β
1、s、b
1)；
And adopt the minimum value of genetic algorithm for solving response model;
Step 5: can carry out three-dimensional modeling according to impeller optimal value, and carry out numerical simulation, see and reach designing requirement, if reach designing requirement, can carry out verification experimental verification, if do not reach, repeating step two to four be until reach requirement.
2. according to the said a kind of centrifugal pump cavitation performance method for designing that improves of claim 1, the method that it is characterized in that multi-scheme design in step 2 is that centrifugal pump spiral casing is constant, to impeller geometric parameter D
1, D
2, β
1, β
2,
s, b
1, b
2carry out Orthogonal Experiment and Design, analyze geometric parameter to cavitation performance influence degree, select the larger parameter [D of cavitation performance impact
1, β
1, s, b
1], then adopt Latin hypercube experimental design method, to parameter [D
1, β
1, s, b
1] carry out multi-scheme design.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104504219A (en) * | 2015-01-09 | 2015-04-08 | 江苏大学 | CFD-based prediction method of centrifugal pump cavitation performance |
| CN104564716A (en) * | 2015-01-06 | 2015-04-29 | 浙江理工大学 | Improvement method of centrifugal pump steady flow impeller |
| CN104675713A (en) * | 2015-02-10 | 2015-06-03 | 江苏大学 | Centrifugal pump non-overload design method based on data sample |
| CN105114336A (en) * | 2015-08-07 | 2015-12-02 | 扬州大学 | Method for calculating cavitation performance of large-scale low-lift pump device |
| CN107194145A (en) * | 2017-04-11 | 2017-09-22 | 江苏大学 | A kind of centrifugal pump cavitation corrosion Numerical Predicting Method |
| CN112307596A (en) * | 2020-09-28 | 2021-02-02 | 东风汽车集团有限公司 | Cavitation improvement method and device for engine oil pump of engine |
| CN112576537A (en) * | 2020-12-14 | 2021-03-30 | 湘潭大学 | Real-time evaluation method and evaluation system for centrifugal pump cavitation degree |
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| CN102536875A (en) * | 2012-02-01 | 2012-07-04 | 江苏大学 | Centrifugal pump inlet cavitation visualizing device |
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| CN102536875A (en) * | 2012-02-01 | 2012-07-04 | 江苏大学 | Centrifugal pump inlet cavitation visualizing device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564716A (en) * | 2015-01-06 | 2015-04-29 | 浙江理工大学 | Improvement method of centrifugal pump steady flow impeller |
| CN104504219A (en) * | 2015-01-09 | 2015-04-08 | 江苏大学 | CFD-based prediction method of centrifugal pump cavitation performance |
| CN104504219B (en) * | 2015-01-09 | 2017-08-04 | 江苏大学 | A kind of Forecasting Methodology of the centrifugal pump cavitation performance based on CFD |
| CN104675713A (en) * | 2015-02-10 | 2015-06-03 | 江苏大学 | Centrifugal pump non-overload design method based on data sample |
| CN105114336A (en) * | 2015-08-07 | 2015-12-02 | 扬州大学 | Method for calculating cavitation performance of large-scale low-lift pump device |
| CN107194145A (en) * | 2017-04-11 | 2017-09-22 | 江苏大学 | A kind of centrifugal pump cavitation corrosion Numerical Predicting Method |
| CN112307596A (en) * | 2020-09-28 | 2021-02-02 | 东风汽车集团有限公司 | Cavitation improvement method and device for engine oil pump of engine |
| CN112307596B (en) * | 2020-09-28 | 2023-02-28 | 东风汽车集团有限公司 | Cavitation erosion improvement method and device for engine oil pump of engine |
| CN112576537A (en) * | 2020-12-14 | 2021-03-30 | 湘潭大学 | Real-time evaluation method and evaluation system for centrifugal pump cavitation degree |
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Application publication date: 20140806 |