CN113548175B - Control device and method for angular vortex of boundary layer flowing to corner - Google Patents
Control device and method for angular vortex of boundary layer flowing to corner Download PDFInfo
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- CN113548175B CN113548175B CN202110814632.1A CN202110814632A CN113548175B CN 113548175 B CN113548175 B CN 113548175B CN 202110814632 A CN202110814632 A CN 202110814632A CN 113548175 B CN113548175 B CN 113548175B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C23/00—Influencing air flow over aircraft surfaces, not otherwise provided for
- B64C23/06—Influencing air flow over aircraft surfaces, not otherwise provided for by generating vortices
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Abstract
The application relates to a control device and a method for corner boundary layer angular vortex flow, wherein the device comprises: the vortex generator and the control mechanism are fixedly arranged in a boundary layer of the bottom wall and/or the side wall; the control mechanism is fixedly arranged on the bottom wall and/or the side wall and is in transmission connection with the vortex generator, and is used for controlling the vortex generator to rotate according to the enhancement or reduction requirement of the angular vortex so as to form wake vortexes in the same or opposite rotating directions with the angular vortex. The control mechanism includes: the sensor of fixed establishing on the diapire, fixed establish in vortex generator's bottom and with the driving piece of vortex generator linkage with link to each other with sensor and driving piece simultaneously in order to be used for gathering sensor data and control driving piece pivoted control. The method comprises the following steps: any control device for controlling the corner boundary layer corner vortex is arranged in the corner vortex formed by the corner boundary layer. The method and the device can realize real-time continuous control of the diagonal vortex.
Description
Technical Field
The application relates to the technical field of boundary layer control, in particular to a device and a method for controlling corner boundary layer angular vortices flowing to corners.
Background
Flow direction corner boundary layers are widely present in aircraft inboard and outboard flows, such as wing body fusions, the root/tip of blades in turbomachinery, aircraft air intakes, and the corners of any rectangular channel. Such corners allow boundary layers, which would otherwise develop on the respective wall, to interact at this location, in the case of turbulence, to form a complex three-dimensional flow, while at the same time generating a prandtl type two secondary flow. The typical structure of such secondary flow is a pair of counter-rotating vortex pairs, i.e., angular vortices, as shown in fig. 1.
The flow passing the flow direction corner formed by the two walls creates some vortex structure at the leading edge, which however cannot be sustained and is dissipated as it develops downstream. The corner vortex is caused by the interaction of adjacent wall surfaces, and can exist and gradually develop in the flowing corner all the time. Fig. 2 is the flow structure at the flow cross-sectional location, with the transverse velocity vectors showing that the two vortices are rotating in opposite directions. As shown in fig. 3, the flow direction is curved toward the corner boundary layer by the corner vortex.
On the one hand, the corner vortex draws high-energy flow into the corner, and simultaneously draws low-energy flow in the corner into the main flow, and has important significance on flow blending.
On the other hand, the angular vortex can cause large changes of heat flow density and friction distribution near the corner, and large errors are brought to estimation of heat transfer and resistance distribution of the surface of the aircraft.
In some cases, the incoming flow changes at any moment, and the boundary layer flowing to the corner changes, so that the corner vortex needs to be regulated in real time.
Disclosure of Invention
In view of the above, it is necessary to provide a control device for controlling angular vortices of a flow direction corner boundary layer, which can automatically enhance or attenuate the angular vortices formed in the flow direction corner boundary layer as required to continuously control the flow field.
A control apparatus for controlling angular vortices of a streamwise corner boundary layer, comprising: a flow direction corner, a vortex generator and a control mechanism;
the flow direction corner is formed by intersecting a bottom wall and a side wall;
the vortex generator is fixedly arranged in a boundary layer of the bottom wall and/or the side wall;
the control mechanism is fixedly arranged on the bottom wall and/or the side wall and is in transmission connection with the vortex generator, and the control mechanism is used for controlling the vortex generator to rotate according to the enhancement or weakening requirement of the angular vortex so as to form wake vortexes with the same or opposite rotating directions of the angular vortex.
In one embodiment, the control mechanism comprises: sensors, drives and controls;
the sensor is fixedly arranged on the bottom wall and used for acquiring friction force data of the bottom wall;
the driving piece is fixedly arranged at the bottom of the vortex generator and is linked with the vortex generator;
the control piece is simultaneously connected with the sensor and the driving piece so as to be used for acquiring data of the sensor and controlling the driving piece to rotate.
In one embodiment, the vortex generator is a plate-shaped structure, and the vortex generator is vertically arranged on the bottom wall and/or the side wall;
when the vortex generator is arranged on the bottom wall, and one end of the vortex generator in the upstream direction of the incoming flow is offset towards the direction of the side wall, the boundary layer generates a wake vortex rotating anticlockwise in the part of the bottom wall;
when the vortex generator is arranged on the side wall, and one end of the vortex generator in the upstream direction of the incoming flow is offset towards the direction of the bottom wall, the boundary layer generates a wake vortex rotating clockwise in the part of the side wall;
when the vortex generator is arranged on the bottom wall, and one end of the vortex generator, which is positioned in the downstream direction of the incoming flow, is offset towards the direction of the side wall, the boundary layer can generate a wake vortex which rotates clockwise in the part of the bottom wall;
when the vortex generator is arranged on the side wall, and one end of the vortex generator in the downstream direction of the incoming flow is offset towards the direction of the bottom wall, the boundary layer can generate a wake vortex rotating anticlockwise in the part of the side wall.
In one embodiment, when the vortex generator is disposed on the bottom wall, the centroid thereof has a position coordinate of (x, y, z); when the vortex generator is arranged on the side wall, the position coordinate of the mass center of the vortex generator is (x, z, y); taking the flow direction corner leading edge as a coordinate origin, the position coordinates satisfy the following relation:
y＝αδ
wherein x is the coordinate of the vortex generator along the incoming flow direction distance to the corner leading edge; y is the coordinate of the vortex generator in the vertical direction; z is the vortex generator coordinate in the horizontal direction; α, β are constants; δ is an estimated value of the local boundary layer thickness; θ is the dihedral angle of the bottom wall and the side wall of the flow direction corner; re is the Reynolds number of the incoming flow.
In one embodiment, the number of the vortex generators is more than two, the vortex generators are divided into two groups, one group of the vortex generators is arranged on the bottom wall, the other group of the vortex generators is arranged on the side wall, and the difference between the numbers of the two groups of the vortex generators is 0 or 1.
In one embodiment, the vortex generator has a length of 3y to 5y, a height of 2y, and a thickness of 1/5y to 1/3y.
In one embodiment, the vortex generator is a rectangular parallelepiped structure, a triangular prism structure, a rectangular pyramid structure, an arc plate structure, or a wave plate structure.
In one embodiment, when the vortex generator is a triangular prism structure or a rectangular pyramid structure, the tip of the vortex generator faces the incoming flow direction.
In one embodiment, the vortex generator is fixedly connected to the bottom wall and/or the side wall by a screw connection or an adhesive connection.
A control method for corner boundary layer angular vortices, which is characterized in that any control device for corner boundary layer angular vortices is arranged in the corner vortices formed on the corner boundary layer.
The control device for the corner boundary layer angular vortex is characterized in that the vortex generators are arranged in the boundary layer of the flow direction corner formed by the bottom wall and the side wall, and the control mechanism is arranged to control the vortex generators to rotate in real time according to requirements, so that different incoming flows can form wake vortexes which are the same as or opposite to the rotation direction of the angular vortex after passing through the vortex generators at different angles, and the wake vortexes and the angular vortexes are mutually superposed or offset, so that the angular vortexes flowing to the boundary layer of the corner are effectively enhanced or weakened, the flowing mixing is further promoted, or the friction force and the heat flow density distribution flowing to the position near the corner are improved. This simple structure is practical, can not influence original flow direction turning structure, and the wake vortex can continuously exist in the flow field, therefore can realize weakening or reinforcing effect continuously of diagonal angle vortex, and control mechanism can real-time control vortex generator's action, realizes the real-time automatic control to the flow field.
Drawings
FIG. 1 is a schematic diagram of simulation results of corner vortex development in a flow direction corner;
FIG. 2 is a schematic view of a flow structure at a flow direction cross-sectional location;
FIG. 3 is a schematic illustration of the bending effect of corner vortices on the flow-direction corner boundary layer;
FIG. 4 is a schematic illustration of the enhancement effect of flow to a corner in one embodiment;
FIG. 5 is a schematic illustration of the attenuation effect of a flow to a corner in one embodiment;
FIG. 6 is a schematic view of a control device for flow to a corner boundary layer in one embodiment;
FIG. 7 is a schematic illustration of wake vortex direction for enhanced effect in one embodiment;
FIG. 8 is a schematic illustration of wake vortex direction for a damping effect in one embodiment;
FIG. 9 is a schematic illustration of corner vortex simulation under an uncontrolled condition in one embodiment;
FIG. 10 is a schematic illustration of angular vortex simulation under enhanced angular vortex conditions in one embodiment;
FIG. 11 is a schematic illustration of corner vortex simulation with reduced corner vortices in one embodiment;
FIG. 12 is a schematic diagram of a multiple vortex generator arrangement in one embodiment;
FIG. 13 is one of the schematic shapes of a vortex generator in one embodiment;
FIG. 14 is a second schematic view of the shape of a vortex generator according to an embodiment;
fig. 15 is a third schematic view of the shape of the vortex generator in one embodiment.
The reference numbers:
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The present application provides a control device for flow to corner boundary layer angular vortices, which in one embodiment comprises: flow direction corners, vortex generators 4 and control mechanisms; the flow direction corner is formed by intersecting the bottom wall 2 and the side wall 3; the vortex generators 4 are fixedly arranged in the boundary layer 1 of the bottom wall 2 and/or the side wall 3; the control mechanism is fixedly arranged on the bottom wall 2 and/or the side wall 3 and is in transmission connection with the vortex generator 4, and is used for controlling the vortex generator 4 to rotate according to the enhancing or weakening requirement of the angular vortex 5 so as to form a wake vortex 6 which is in the same direction as or opposite to the rotation direction of the angular vortex 5.
As shown in fig. 4 to 6, the flow direction corner is formed by the intersection of two wall surfaces, i.e., the bottom wall 2 and the side wall 3. The flow forms a flow structure on the flow direction corner, namely a boundary layer 1 flowing to the corner, and the boundary layer 1 is gradually thickened along the incoming flow direction. The angular vortex 5 formed flowing towards the corner boundary layer 1 is a pair of oppositely directed vortex pairs and is symmetrical about a corner angle bisector. The vortex generator 4 is provided in the boundary layer 1, and when an incoming flow passes through the vortex generator 4, the vortex generator 4 interacts with the incoming flow to generate wake vortices 6. The control mechanism is fixedly arranged on the bottom wall 2 and/or the side wall 3, and when the angular vortex 5 needs to be enhanced, the control mechanism controls the vortex generator 4 to rotate to a position where a wake vortex 6 with the same rotation direction as the angular vortex 5 can be formed; when the angular vortex 5 needs to be attenuated, the control mechanism controls the vortex generator 4 to rotate to a position where it can form a wake vortex 6 opposite to the direction of rotation of the angular vortex 5.
The control device for the corner boundary layer angular vortex is characterized in that the vortex generator 4 is arranged in the boundary layer 1 which is formed by the bottom wall 2 and the side wall 3 and flows to the corner, the control mechanism is arranged to control the vortex generator 4 to rotate in real time according to requirements, so that wake vortexes 6 which are the same as or opposite to the rotation direction of the angular vortex 5 can be formed after different incoming flows pass through the vortex generators 4 at different angles, and the wake vortexes 6 and the angular vortex 5 are mutually overlapped or offset, so that the angular vortex 5 flowing to the boundary layer 1 of the corner is effectively enhanced or weakened, flowing mixing is further promoted, or the friction force and heat flow density distribution flowing to the corner are improved. This simple structure is practical, can not influence original flow direction turning structure, and wake vortex 6 can continuously exist in the flow field, therefore can realize weakening or reinforcing effect to lasting of diagonal angle vortex 5, and control mechanism can real time control vortex generator 4's action, realizes the real-time automatic control to the flow field.
In one embodiment, the control mechanism comprises: a sensor 7, a driver 8 and a control; the sensor 7 is fixedly arranged on the bottom wall 2 and is used for acquiring friction force data of the bottom wall 2; the driving piece 8 is fixedly arranged at the bottom of the vortex generator 4 and is linked with the vortex generator 4; the control part is connected with the sensor 7 and the driving part 8 at the same time, and is used for acquiring data of the sensor 7 and controlling the driving part 8 to rotate.
As shown in fig. 6, the control mechanism includes a sensor 7, a driving member 8, and a control member (not shown in the figure).
The sensor 7 is a friction force sensor, is arranged on the bottom wall 2 and is used for acquiring friction force data of the bottom wall 2 in real time. Setting a reference value of friction force data according to a numerical simulation condition, and monitoring the friction force condition of the installation position in real time; when the friction force of the installation position is greater than the reference value, the angular vortex 5 needs to be enhanced; when the frictional force at the installation position is smaller than the reference value, it is necessary to weaken the angular vortex 5. The sensor data at different locations may be compared to each other to measure the degree of enhancement or reduction. The number of the sensors 7 is more than one, and the sensors can be arranged according to specific requirements, and the invention is not limited.
The driving member 8 may be a motor rotating mechanism, or may be another structure capable of realizing linkage. The driving part 8 is fixedly arranged at the bottom of the vortex generator 4 and is linked with the vortex generator 4, so that the driving part 8 drives the vortex generator 4 to rotate to a required position when the requirement of enhancing or weakening the angular vortex 5 is received.
The control part is connected with the sensors 7, and when the sensors 7 are multiple, the control part is connected with the multiple sensors 7 in parallel to collect friction force data of each sensor 7. Meanwhile, the control part is connected with the driving part 8, and enables the driving part 8 to complete corresponding actions according to the friction force data.
In this embodiment, a numerical model is established, simulation is performed, angle parameters are optimized, corresponding data of different incoming flows and vortex generator angles can be obtained, and the friction force at the angle is taken as a standard value. In the incoming flow process, the control part collects friction force data through the sensor in real time, judges the angle of the angle vortex and the corresponding vortex generator needing to be enhanced or weakened, controls the driving part and drives the vortex generator to rotate, considers that the requirement is met until the collected friction force reaches a standard value, and stops rotating.
Specifically, the air rarefaction degree of the aircraft is different in different flying heights, so the combustion efficiency is also different, in order to keep the combustion efficiency efficient and stable, the mixing efficiency needs to be enhanced in the takeoff process of the aircraft, and the different mixing efficiencies correspond to different incoming flows flowing to the corners. And establishing a numerical model, simulating, optimizing angle parameters, obtaining corresponding data of the vortex generator angle when the incoming flow and the enhancement effect are optimal under different mixing requirements, and taking the friction force under the angle as a standard value. In the incoming flow process, the control part collects friction force data through the sensor, when the friction force is larger than a standard value, the angular vortex needs to be enhanced, the driving part is controlled and the vortex generator is driven to rotate, and when the collected friction force reaches the standard value, the requirement is met, and the rotation is stopped. When the incoming flow changes continuously, the control part collects the changed friction force data in real time through the sensor, judges whether the angular vortex needs to be enhanced or weakened in real time, controls the driving part in real time and drives the vortex generator to rotate to the angular position corresponding to the standard value.
In one embodiment, the vortex generator 4 is a plate-like structure, and the vortex generator 4 is vertically arranged on the bottom wall 2 and/or the side wall 3; when the vortex generator 4 is arranged on the bottom wall 2, and one end of the vortex generator 4 in the upstream direction of the incoming flow is offset towards the side wall 3, the boundary layer 1 generates a wake vortex 6 rotating anticlockwise in the part of the bottom wall 2; when the vortex generator 4 is arranged on the side wall 3, and one end of the vortex generator 4 in the upstream direction of the incoming flow is offset towards the direction of the bottom wall 2, the boundary layer 1 generates a wake vortex 6 which rotates clockwise in the part of the side wall 3; when the vortex generator 4 is arranged on the bottom wall 2, and one end of the vortex generator 4 in the downstream direction of the incoming flow is offset towards the side wall 3, the boundary layer 1 generates a wake vortex 6 which rotates clockwise in the part of the bottom wall 2; when the vortex generator 4 is provided on the side wall 3 and the end of the vortex generator 4 located in the downstream direction of the incoming flow is offset in the direction of the bottom wall 2, the boundary layer 1 generates a wake vortex 6 rotating counterclockwise in the portion of the side wall 3.
The vortex generators 4 are generally elongated plate-like structures arranged on the wall surfaces of the flow-direction corners. The number of vortex generators 4 is more than one, and may be disposed on the bottom wall 2, the side wall 3, or both the bottom wall 2 and the side wall 3.
The vortex generator 4 may be selected from any suitable shape, size, and material, and the present invention is not limited thereto, and only the wake vortex 6 may be generated.
The vortex generator 4 forms a certain angle with the flow, as shown in fig. 7 and 8, when the vortex generator 4 is arranged on the bottom wall 2 and one end of the vortex generator 4 in the upstream direction of the incoming flow is deviated towards the direction of the side wall 3, the incoming flow and the vortex generator 4 act, the boundary layer 1 forms a wake vortex 6 which rotates anticlockwise along the flow direction in the part of the bottom wall 2, and the wake vortex 6 is superposed with the angle vortex 5 which rotates anticlockwise, so that the angle vortex 5 is enhanced; when the vortex generator 4 is arranged on the side wall 3 and one end of the vortex generator 4 positioned in the upstream direction of the incoming flow deviates towards the direction of the bottom wall 2, the incoming flow and the vortex generator 4 act, a wake vortex 6 which rotates clockwise along the flowing direction is formed in the part of the boundary layer 1 on the side wall 3 and is superposed with the angular vortex 5 which rotates clockwise, and the angular vortex 5 is enhanced; when the vortex generator 4 is arranged on the bottom wall 2 and one end of the vortex generator in the downstream direction of the incoming flow deviates towards the direction of the side wall 3, the incoming flow acts on the vortex generator 4, a wake vortex 6 which rotates clockwise along the flow direction is formed in the part of the boundary layer 1 on the bottom wall 2, and the wake vortex is offset from an angle vortex 5 which rotates anticlockwise, so that the angle vortex 5 is weakened; when the vortex generator 4 is disposed on the sidewall 3 and one end of the vortex generator in the downstream direction of the incoming flow is offset toward the bottom wall 2, the incoming flow and the vortex generator 4 act, the boundary layer 1 forms wake vortexes 6 rotating counterclockwise along the flow direction in the portion of the sidewall 3, and the wake vortexes counteract the corner vortexes 5 rotating clockwise, so that the corner vortexes 5 are weakened.
The vortex generator 4 is arranged on a flow direction corner at a certain angle, and the aim of controlling the angular vortex 5 can be achieved by establishing a numerical model, simulating and optimizing angle parameters, so that the effect of enhancing or offsetting the angular vortex 5 is realized. As shown in fig. 9, the cloud graph is a velocity contour line cloud graph flowing to the corner boundary layer 1 under an uncontrolled condition, different lines indicate different velocities, the closer to the zero point, the smaller the velocity is, the bending of the contour line indicates the existence of the angular vortex 5, the bending degree represents the size of the angular vortex 5, and the larger the bending degree is, the stronger the angular vortex 5 is; at the corner bisector position, the contour curves toward the corner, demonstrating the presence of angular vortices 5. As shown in fig. 10, which is a cloud of velocity contours of the wake vortex 6 flowing to the corner boundary layer 1 in the same rotational direction and provided with the vortex generators 4 in the manner shown in fig. 7, the curvature of the contours becomes larger, indicating that the enhancement effect is indeed produced on the corner vortex 5. As shown in fig. 11, which is a cloud of velocity contours of the wake vortex 6 flowing towards the corner boundary layer 1 in the opposite direction of rotation and provided with the vortex generator 4 in the manner shown in fig. 8, the curvature of the contours becomes smaller, indicating that a weakening effect does occur on the corner vortex 5.
Preferably, when the vortex generator 4 is arranged on the bottom wall 2, its centroid position coordinates are (x, y, z); when the vortex generator 4 is arranged on the side wall 3, the position coordinate of the mass center is (x, z, y); taking the flow direction corner front edge as a coordinate origin, the position coordinates satisfy the following relation:
y＝αδ
wherein x is the coordinate of the vortex generator 4 along the incoming flow direction distance to the leading edge of the corner; y is the coordinate of the vortex generator 4 in the vertical direction; z is the coordinate of the vortex generator 4 in the horizontal direction; α, β are constants; δ is an estimated value of the local boundary layer 1 thickness; θ is the dihedral angle of the bottom wall 2 and the side wall 3 of the flow direction corner; re is the Reynolds number of the incoming flow.
In this embodiment, α is 0.24 and β is 4.75.δ is an estimated value of the local boundary layer 1 thickness, which refers to the boundary layer thickness at the x-position. (x, y, z) and (x, z, y) are the vortex core positions of the angular vortexes 5, and the angular vortexes 5 can be enhanced or weakened fundamentally and effectively by placing the position coordinates of the mass centers of the vortex generators 4 at the vortex core positions.
An x value is determined, i.e. the coordinates of the vortex generator 4 in the incoming flow direction are determined first, and then the coordinates of the vortex generator 4 in the vertical direction and the horizontal direction can be obtained, so that the preferred position of the vortex generator 4 can be determined. The vortex generator 4 is arranged according to the method, and the control effect on the angular vortex 5 is better.
In one embodiment, the number of the vortex generators 4 is two or more, the vortex generators 4 are divided into two groups, one group of the vortex generators 4 is arranged on the bottom wall 2, the other group is arranged on the side wall 3, and the difference between the numbers of the two groups of the vortex generators 4 is 0 or 1.
According to the requirements of different flow direction positions on the flow, a plurality of or a plurality of groups of vortex generators 4 can be arranged, so that the control of angular vortexes 5 at different positions of the same flow direction corner is realized, and the effect of strengthening or weakening is achieved.
As shown in fig. 12, the vortex generators 4 may be arranged in parallel, or other arrangements may be selected according to specific requirements, such as staggered arrangement, which is not limited by the present invention.
Preferably, the vortex generator or generators 4 closest to the upstream are fixed in the first 20% of the upstream of the incoming flow.
The angular vortices 5 are generated in the flow-direction corners and gradually develop in the direction of the incoming flow, and the intensity at the upstream position is relatively small, so that the vortex generator 4 is fixed upstream and arranged at the vortex core position of the angular vortices 5, and the doubling-up enhancement or almost complete cancellation of the angular vortices 5 can be achieved.
In this embodiment, one or a pair of vortex generators 4 closest to the upstream are fixedly arranged at the position 20% upstream of the incoming flow, and other positions can be selected according to actual requirements.
In one embodiment, vortex generator 4 has a length of 3y to 5y, a height of 2y, and a thickness of 1/5y to 1/3y.
The size of vortex generator 4 is according to above-mentioned setting, can effective control angle vortex 5, and the structure is small and exquisite, can not influence original flow direction corner structure.
In one embodiment, the vortex generator 4 is a rectangular parallelepiped structure, a triangular prism structure, a rectangular pyramid structure, an arc plate structure, or a wave plate structure.
As shown in fig. 13 to 15, the vortex generator 4 is a rectangular parallelepiped structure, a triangular prism structure, or a rectangular pyramid structure, and the vortex generator 4 may also be selected from other shapes according to specific situations, such as an arc plate structure or a wave plate structure. For subsonic incoming flow, the control effect of the vortex generator 4 with the cuboid structure on the angular vortex 5 is good; and for supersonic incoming flow, the vortex generator 4 with the triangular prism structure has a better control effect on the angular vortex 5.
In one embodiment, when the vortex generator 4 is a triangular prism structure or a rectangular pyramid structure, the tip of the vortex generator 4 faces the incoming flow direction.
The tip of the vortex generator 4 is directed to the incoming flow direction, so that the opposite direction has enough area to generate the wake vortex 6, thereby ensuring the control effect of the angular vortex 5.
In one embodiment, the vortex generators 4 are fixedly attached to the bottom wall 2 and/or the side wall 3 by a bolted or glued connection.
In this embodiment, a threaded hole may be provided at the bottom of the vortex generator 4, and the vortex generator may be fixed to the bottom wall 2 or the side wall 3 of the flow corner by a bolt, or may be directly fixed by using an adhesive.
The application also provides a control method of the corner boundary layer angular vortex, and in one embodiment, any control device of the corner boundary layer angular vortex 5 is arranged in the angular vortex 5 formed by the flowing corner boundary layer 1. According to the control method of the corner boundary layer angular vortex flowing to the corner, the control device of the corner boundary layer angular vortex flowing to the angular vortex 5 formed on the corner boundary layer 1 is arranged, the control mechanism is arranged to control the vortex generator 4 to rotate in real time according to requirements, so that wake vortexes 6 which are the same as or opposite to the rotation direction of the angular vortex 5 can be formed after different incoming flows pass through the vortex generators 4 at different angles, and the wake vortexes 6 and the angular vortexes 5 are mutually overlapped or offset, so that the angular vortexes 5 flowing to the corner boundary layer 1 are effectively enhanced or weakened, flowing mixing is promoted, or the friction force flowing to the vicinity of the corner and the heat flow density distribution are improved. The method is simple and practical, the original flowing direction corner structure cannot be influenced, and the wake vortex 6 can continuously exist in the flow field, so that the continuous weakening or enhancing effect of the diagonal vortex 5 can be realized, and the control mechanism can control the action of the vortex generator 4 in real time to realize the continuous control of the flow field.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (10)
1. A control device for controlling angular vortex flow to a corner boundary layer, comprising: a flow direction corner, a vortex generator and a control mechanism;
the flow direction corner is formed by intersecting a bottom wall and a side wall;
the vortex generators are fixedly arranged in the boundary layer of the bottom wall and/or the side wall; the boundary layer gradually thickens along the incoming flow direction;
the control mechanism is fixedly arranged on the bottom wall and/or the side wall and is in transmission connection with the vortex generator, and is used for controlling the vortex generator to rotate according to the enhancement or attenuation requirement of the angular vortex so as to form wake vortexes in the same or opposite rotating directions with the angular vortex; the wake vortex and the angular vortex are mutually superposed or offset, so that the angular vortex flowing to the corner boundary layer is effectively enhanced or weakened.
2. The device of claim 1, wherein the control mechanism comprises: sensors, drives and controls;
the sensor is fixedly arranged on the bottom wall and used for acquiring friction force data of the bottom wall;
the driving piece is fixedly arranged at the bottom of the vortex generator and is linked with the vortex generator;
the control piece is simultaneously connected with the sensor and the driving piece so as to be used for acquiring data of the sensor and controlling the driving piece to rotate.
3. The device of claim 2, wherein the vortex generator is a plate-like structure and is vertically disposed on the bottom wall and/or the side wall;
when the vortex generator is arranged on the bottom wall, and one end of the vortex generator in the upstream direction of the incoming flow is offset towards the direction of the side wall, the boundary layer generates a wake vortex rotating anticlockwise in the part of the bottom wall;
when the vortex generator is arranged on the side wall, and one end of the vortex generator in the upstream direction of the incoming flow is offset towards the direction of the bottom wall, the boundary layer generates a wake vortex rotating clockwise in the part of the side wall;
when the vortex generator is arranged on the bottom wall, and one end of the vortex generator in the downstream direction of the incoming flow is offset towards the direction of the side wall, the boundary layer generates a wake vortex rotating clockwise in the part of the bottom wall;
when the vortex generator is arranged on the side wall, and one end of the vortex generator in the downstream direction of the incoming flow is offset towards the direction of the bottom wall, the boundary layer can generate a wake vortex rotating anticlockwise in the part of the side wall.
4. The apparatus of claim 3 wherein when said vortex generator is positioned on said bottom wall, its centroid has a position coordinate of (x, y, z); when the vortex generator is arranged on the side wall, the position coordinate of the mass center of the vortex generator is (x, z, y); taking the flow direction corner leading edge as a coordinate origin, the position coordinates satisfy the following relation:
y＝αδ
wherein x is the coordinate of the vortex generator along the incoming flow direction distance to the corner leading edge; y is the coordinate of the vortex generator in the vertical direction; z is the vortex generator coordinate in the horizontal direction; α, β are constants; δ is an estimated value of the local boundary layer thickness; θ is the dihedral angle of the bottom wall and the side wall of the flow direction corner; re is the Reynolds number of the incoming flow.
5. The device of claim 4, wherein the number of vortex generators is two or more, the vortex generators are divided into two groups, one of the groups of vortex generators is disposed on the bottom wall, the other group is disposed on the side wall, and the difference between the number of vortex generators in the two groups is 0 or 1.
6. The device of claim 4 or 5, wherein the vortex generator has a length of 3y-5y, a height of 2y, and a thickness of 1/5y-1/3y.
7. The device of claim 1 or 2, wherein the vortex generator is a rectangular parallelepiped structure, a triangular prism structure, a rectangular pyramid structure, an arc plate structure, or a wave plate structure.
8. The device of claim 7, wherein when the vortex generator is a triangular prism structure or a rectangular pyramid structure, a tip of the vortex generator faces an incoming flow direction.
9. The device of claim 8, wherein the vortex generator is fixedly attached to the bottom wall and/or the side wall by a bolted or glued connection.
10. A method of controlling an angular vortex of a streamwise corner boundary layer, characterized in that the device of any one of claims 1 to 9 is arranged in an angular vortex formed in the streamwise corner boundary layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110814632.1A CN113548175B (en) | 2021-07-19 | 2021-07-19 | Control device and method for angular vortex of boundary layer flowing to corner |
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