CN109238633B - Flow field display device - Google Patents
Flow field display device Download PDFInfo
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- CN109238633B CN109238633B CN201811306457.XA CN201811306457A CN109238633B CN 109238633 B CN109238633 B CN 109238633B CN 201811306457 A CN201811306457 A CN 201811306457A CN 109238633 B CN109238633 B CN 109238633B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
- G01M9/067—Measuring arrangements specially adapted for aerodynamic testing dealing with flow visualisation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/08—Aerodynamic models
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention provides a flow field display device. The device comprises: a power supply, a positive electrode, a negative electrode, an electrode assembly, and an electrode assembly control system, the electrode assembly including an electrode shield; the power supply is used for supplying electric energy to the positive electrode and the negative electrode; the electrode assembly is used for adjusting the distance and the angle between the positive electrode and the negative electrode and the position and the angle of the electrode protection cover under the control of the electrode assembly control system; and the electrode assembly control system is used for controlling the electrode assembly to adjust the angle of the electrode protection cover according to the position of the diffuser, adjusting the angles of the positive electrode and the negative electrode along with the model support, and controlling the on and off of the power supply. The invention can ensure the continuous and stable discharge by selecting different positive and negative electrode combinations.
Description
Technical Field
The invention relates to the field of aerodynamic test equipment, in particular to a flow field display device.
Background
In the conventional hypersonic wind tunnel test process, the gas density in the flow field changes along with the flow field parameters, the measurement position and the time, the principle that the light is deflected due to the change of the gas refractive index is utilized, and the flow field is displayed by the method of shading or schlieren and the like. However, in the low-density flow field, since the average density is low and the absolute value of the density change is too small, the flow field cannot be displayed by an optical method based on the light deflection principle. Based on the correlation between the radiation intensity and the gas density in the gas discharge process, the flow field can be displayed by adopting a gas discharge method.
In a low pressure gas flow field, the discharge between the electrodes causes the gas to glow, which is an anodic glow column produced by the spontaneous emission of excited molecules under the influence of an electric field, the intensity of which depends on the gas density in the controlled volume. In the discharging process, the positive glow column area is relatively stable, so that a thin gas flow field (1000Pa-0.1Pa) can be displayed by applying a glow discharge method; the existing method for displaying the flow field by using the glow discharge principle stays at the theoretical research stage, however, in a specific test, a plurality of actual problems which need to be solved urgently exist, for example, a positive electrode is positioned between a spray pipe and a diffuser, and a discharge reaction can occur between the positive electrode and the spray pipe or the diffuser, so that the flow field display effect is influenced; for example, in the test process, the test model adjusts the attack angle along with the model support, and how to ensure the glow discharge display effect after the change of the attack angle is an urgent problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a flow field display device, which aims to solve the problems that in the prior art, the discharge reaction between a positive electrode and a spray pipe or a diffuser influences the effect of flow field display, and in the test process, a test model adjusts an attack angle along with model support, so that the glow discharge display effect after the attack angle changes cannot be ensured.
In order to solve the technical problem, the invention is realized as follows:
an embodiment of the present invention provides a flow field display device, including: a power supply, a positive electrode, a negative electrode, an electrode assembly, and an electrode assembly control system, the electrode assembly including an electrode shield; the power supply is respectively connected with the positive electrode and the negative electrode, the positive electrode is arranged outside the flow field, the negative electrode is arranged in the flow field, and the negative electrode is arranged on the surface of the test model; the electrode assembly is connected to the positive electrode; the power supply is used for supplying electric energy to the positive electrode and the negative electrode; the electrode assembly is used for adjusting the distance and the angle between the positive electrode and the negative electrode and the position and the angle of the electrode protection cover under the control of the electrode assembly control system; and the electrode assembly control system is used for controlling the electrode assembly to adjust the angle of the electrode protection cover according to the position of the diffuser, adjusting the angles of the positive electrode and the negative electrode along with model support, and controlling the power supply to be turned on and off.
Preferably, the electrode assembly further comprises: the device comprises an adjusting support rod, an electrode mounting plate, a spherical adapter, a first transmission rod, a second transmission rod, a motor, a first transmission gear, a second transmission gear, a third transmission gear, a guide rail, a sliding block, a motor supporting seat and a cylinder; one end of the adjusting support rod is connected with the test chamber, and the other end of the adjusting support rod is connected with the electrode protection cover; the positive electrode is arranged on the surface of one side of the electrode mounting plate, and the other side of the electrode mounting plate is connected with one end of the spherical adapter; a round through hole is formed in the middle of the electrode protection cover, and the spherical adapter is arranged at the round through hole in the middle of the electrode protection cover; one end of the second transmission rod is fixedly connected with the spherical connecting seat, and the other end of the second transmission rod penetrates through the first transmission rod to be connected with the second transmission gear; one end of the first transmission rod is fixedly connected with the electrode protection cover, and the other end of the first transmission rod is connected with the third transmission gear; the motor is connected with the first transmission gear; the motor is connected with the motor supporting seat through the guide rail and the sliding block; the air cylinder is fixedly arranged on the motor supporting seat; the first transmission gear is meshed with the second transmission gear and the third transmission gear respectively.
Preferably, the power supply is a high voltage dc power supply.
Preferably, the middle position of the adjusting support rod is sleeved by two polished rods with different diameters so as to adjust the length of the adjusting support rod.
Preferably, the positive electrode is a plurality of point electrodes, and the negative electrode includes at least one of a point electrode, a line electrode, and a plane electrode.
Preferably, the electrode protection cover is of any one of a square structure, a triangular structure and a disc-shaped structure, a circular through hole is formed in the middle of the electrode protection cover, and a limiting ring is arranged at the tail end of the circular through hole.
Preferably, a threaded hole is formed in the middle of the spherical adapter so as to be connected with the electrode mounting plate through a screw.
Preferably, a magnet is arranged on one side of the motor supporting seat so as to realize quick connection with the test chamber.
Preferably, the flow field display device further comprises a motor base, the cylinder comprises a cylinder rod, and the cylinder rod is connected with the motor base through a flange.
Preferably, the adjusting support rod, the electrode protection cover, the electrode mounting panel the spherical adapter, first drive rod, the second drive rod, first drive gear, second drive gear and third drive gear all adopt the polytetrafluoroethylene material to make.
The scheme provided by the embodiment of the invention has the following advantages:
(1) in the test process, the test model supports the rotation angle through the model, the positive electrode at the outer side can automatically rotate by a corresponding angle along with the test model, the surfaces of the two electrodes are always kept parallel, and the continuous and stable discharge is ensured by selecting different positive and negative electrode combinations;
(2) the electrode protection cover can automatically adjust the angle according to the relative distance between the spray pipe and the diffuser, and ensures that the electrode assembly is always positioned outside the flow field area, so that the flow field is prevented from being interfered;
(3) the electrode assembly can adjust the distance between the two electrodes, so that the two electrodes are always in the closest distance in a test, and the power loss of a power supply is reduced; in the electrode assembly, the angle adjustment of the two parts can be realized through one motor;
(4) the positive electrode adopts a plurality of point electrodes, the negative electrode adopts the point electrodes, line electrodes or surface electrodes, after the positive electrode and the negative electrode rotate by an angle, although the surfaces of the positive electrode and the negative electrode can be kept parallel, the distance between the positive electrode and the negative electrode and the overlapping area along the vertical direction of the surfaces of the electrodes can be reduced, and the positive electrode adopts the plurality of point electrodes, so that the discharge effect can be ensured by switching on the point electrode which is always positioned in the positive projection area in the middle of the negative electrode.
Drawings
FIG. 1 is a schematic structural diagram of a flow field display testing apparatus provided in an embodiment of the present invention;
fig. 2 is a schematic structural view of an electrode assembly according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a connection between a spherical adapter and an electrode mounting plate according to an embodiment of the present invention;
fig. 4 is a schematic view illustrating a connection between a motor support and an air cylinder according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, 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.
Example one
Referring to fig. 1, a schematic structural diagram of a testing apparatus for flow field display according to an embodiment of the present invention is shown, and as shown in fig. 1, the flow field display apparatus in the testing apparatus may include: a power source (not shown), a positive electrode 300, a negative electrode 200, an electrode assembly 100, and an electrode assembly control system (not shown).
Next, the construction of the electrode assembly 100 will be described in detail with reference to fig. 2, 3 and 4 of the specification.
Fig. 2 is a schematic structural diagram of an electrode assembly according to an embodiment of the present invention, fig. 3 is a schematic connection diagram of a spherical adapter provided according to an embodiment of the present invention and an electrode mounting plate, fig. 4 is a schematic connection diagram of a motor support base provided according to an embodiment of the present invention and a cylinder, and as shown in fig. 2, fig. 3, and fig. 4, an electrode assembly 100 may include an electrode protection cover 2;
the power supply may be connected to the positive electrode 300 and the negative electrode 200, respectively, the positive electrode 300 is disposed outside the flow field 900, the negative electrode 200 is disposed in the flow field 900, the negative electrode 200 is disposed on the surface of the test model 500, and the electrode assembly 100 is connected to the positive electrode 300;
the power source may be used to provide electrical energy to the positive electrode 300 and the negative electrode 200.
The electrode assembly 100 may be used to adjust the distance and angle between the positive electrode 300 and the negative electrode 200 under the control of an electrode assembly control system. The electrode assembly 100 can also adjust the position and angle of the electrode shield 2.
The electrode assembly control system may be used to control the electrode assembly 100 to adjust the angle of the electrode protection case 2 according to the position of the diffuser 600, to adjust the angles of the positive and negative electrodes 300 and 200 following the model support 400, and to control the power on and off.
In the embodiment of the invention, in the subsequent test process, the test model 500 rotates by the rotation angle of the model support 400, the outer positive electrode 300 can automatically rotate by a corresponding angle along with the test model 500, the surfaces of two electrodes (namely the positive electrode 300 and the negative electrode 200) are always kept parallel, and the continuous and stable discharge is ensured by selecting different combinations of the positive electrode 300 and the negative electrode 200.
In a preferred embodiment of the present invention, the electrode assembly 100 may further include: the electrode mounting plate comprises an adjusting support rod 1, an electrode mounting plate 10, a spherical adapter 9, a first transmission rod 3, a second transmission rod 8, a motor 4, a first transmission gear 5, a second transmission gear 6, a third transmission gear 7, a guide rail 14, a sliding block 11, a motor support seat 13 and a cylinder 12.
One end of the adjusting support rod 1 is connected with the test chamber 700, and the other end is connected with the electrode protection cover 2. The positive electrode 300 is disposed on the surface of one side of the electrode mounting plate 10, and the other side of the electrode mounting plate 10 is connected to one end of the spherical adapter 9.
A circular through hole (not shown in the figure) is arranged in the middle of the electrode protection cover 2, and the spherical adapter 9 is arranged in the circular through hole in the middle of the electrode protection cover 2.
One end of the second transmission rod 8 is fixedly connected with the spherical connecting seat 9, and the other end of the second transmission rod penetrates through the first transmission rod 3 to be connected with the second transmission gear 6.
One end of the first transmission rod 3 is fixedly connected with the electrode protection cover 2, and the other end is connected with the third transmission gear 7.
The motor 4 is connected with the first transmission gear 5, and the motor 4 is connected with the motor supporting seat 13 through the guide rail 14 and the sliding block 11.
The cylinder 12 is fixedly arranged on the motor supporting seat 13; the first transmission gear 5 can be meshed with the second transmission gear 6 for adjusting the angle of the positive electrode 300; of course, the first transmission gear 5 may be engaged with the third transmission gear 7 for adjusting the angle of the electrode protection cover 2.
The electrode assembly control system may also be used to control the extension and retraction of the cylinder 12.
In a preferred embodiment of the present invention, the power source is a high voltage dc power source, for example, a 100KV high voltage dc power source, and in a specific implementation, an appropriate high voltage dc power source may be selected according to actual situations, which is not limited in this embodiment of the present invention.
In another preferred embodiment of the present invention, two polished rods (not shown in the drawings) with different diameters are sleeved together at the middle position of the adjusting support rod 1 to adjust the length of the support rod 1, so that the flow field display device provided by the embodiment of the present invention can be applied to different test scenarios.
In another preferred embodiment of the present invention, the positive electrode 300 may be composed of a plurality of point electrodes, and the negative electrode 200 may be composed of one or more of the point electrodes, the line electrodes, and the plane electrodes, which is not limited in this embodiment of the present invention.
In the embodiment of the present invention, the positive electrode 300 is a plurality of point electrodes, and the negative electrode 200 is a point electrode, a line electrode or a plane electrode, and when the positive electrode 300 and the negative electrode 200 rotate by a certain angle, although the surfaces of the positive electrode 300 and the negative electrode 200 can be kept parallel, the distance and the overlapping area along the vertical direction of the electrode surfaces can be reduced, and the positive electrode 300 is a plurality of point electrodes, and the discharge effect can be ensured by turning on the point electrode which is always located in the middle orthographic projection area of the negative electrode 200 on the positive electrode 300.
In another preferred embodiment of the present invention, the electrode protection cover 2 may have any one of a square structure, a triangular structure, and a circular disc structure, and a limiting ring (not shown) is disposed at a terminal of the circular through hole, and the shape of the electrode protection cover 2 may be selected according to different test scenarios, which is not limited in the embodiment of the present invention.
In another preferred embodiment of the present invention, the spherical adapter 9 is provided with a threaded hole in the middle thereof for connection with the electrode mounting plate 10 by a screw (not shown), and it is understood that the screw thread at one end of the screw is matched with the screw thread of the threaded hole provided in the middle of the spherical adapter 9.
In a specific implementation, the spherical adapter 9 and the electrode mounting plate 10 may be connected in other manners that can be applied to a flow field test scenario, which is not limited in this embodiment of the present invention.
In another preferred embodiment of the present invention, a magnet is disposed on one side of the motor support base 13, and the motor support base 13 can be coupled to the test chamber 700 by the magnet.
In another preferred embodiment of the present invention, the flow field display device may further include a motor base (not shown), and the air cylinder 12 includes a cylinder rod, and the cylinder rod may be connected to the motor base through a flange.
Of course, in a specific implementation, the connection between the cylinder 12 and the motor base may be implemented by using other connection manners, which is not limited in the embodiment of the present invention.
In another preferred embodiment of the present invention, the adjusting support rod 1, the electrode protecting cover 2, the electrode mounting plate 10, the spherical adapter 9, the first transmission rod 3, the second transmission rod 8, the first transmission gear 5, the second transmission gear 6 and the third transmission gear 7 may all be made of teflon.
In a specific implementation, the adjusting support rod 1, the electrode protection cover 2, the electrode mounting plate 10, the spherical adapter 9, the first transmission rod 3, the second transmission rod 8, the first transmission gear 5, the second transmission gear 6 and the third transmission gear 7 may be made of a material selected according to a specific test scenario, which is not limited in the embodiment of the present invention.
In another preferred embodiment of the present invention, the positive electrode 300 may be made of copper or aluminum, and the negative electrode 200 may be made of copper or aluminum.
In a specific implementation, the material of the positive electrode and the negative electrode may be selected according to actual requirements, which is not limited in the embodiment of the present invention.
In the test process of flow field display by adopting the flow field display device provided by the embodiment of the invention, the flow field display device is used for observing shock waves of a test model under the action of airflow and parameters of the flow field, wherein the negative electrode is embedded into the surface of the test model, the positive electrode is positioned outside the flow field, and the flow field is displayed by glow generated by discharge between the two electrodes. The negative electrode is embedded in the surface of the test model and is grounded through a wire. The test model supports the rotation angle through the model, the outer side electrode can automatically rotate by a corresponding angle along with the test model, the surfaces of the two electrodes are always kept parallel, and the continuous and stable discharge is ensured by selecting different positive and negative electrode combinations.
In summary, the flow field display device provided by the embodiment of the invention has the following specific beneficial effects:
(1) in the test process, the test model supports the rotation angle through the model, the outer electrode can automatically rotate by a corresponding angle along with the test model, the surfaces of the two electrodes are always kept parallel, and the continuous and stable discharge is ensured by selecting different positive and negative electrode combinations;
(2) the electrode protection cover can automatically adjust the angle according to the relative distance between the spray pipe and the diffuser, and ensures that the electrode assembly is always positioned outside the flow field area, so that the flow field is prevented from being interfered;
(3) the electrode assembly can adjust the distance between the two electrodes, so that the two electrodes are always in the closest distance in a test, and the power loss of a power supply is reduced; in the electrode assembly, the angle adjustment of the two parts can be realized through one motor;
(4) the positive electrode adopts a plurality of point electrodes, the negative electrode adopts the point electrodes, line electrodes or surface electrodes, after the positive electrode and the negative electrode rotate by an angle, although the surfaces of the positive electrode and the negative electrode can be kept parallel, the distance between the positive electrode and the negative electrode and the overlapping area along the vertical direction of the surfaces of the electrodes can be reduced, and the positive electrode adopts the plurality of point electrodes, so that the discharge effect can be ensured by switching on the point electrode which is always positioned in the positive projection area in the middle of the negative electrode.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A flow field display device, comprising: a power source, a positive electrode, a negative electrode, an electrode assembly, and an electrode assembly control system; the electrode assembly includes an electrode protection case;
the power supply is respectively connected with the positive electrode and the negative electrode, the positive electrode is arranged outside the flow field, the negative electrode is arranged in the flow field, and the negative electrode is arranged on the surface of the test model; the electrode assembly is connected to the positive electrode;
the power supply is used for supplying electric energy to the positive electrode and the negative electrode;
the electrode assembly is used for adjusting the distance and the angle between the positive electrode and the negative electrode and the position and the angle of the electrode protection cover under the control of the electrode assembly control system;
the electrode assembly control system is used for controlling the electrode assembly to adjust the angle of the electrode protection cover according to the position of the diffuser, adjust the angles of the positive electrode and the negative electrode along with the model support, and control the on and off of the power supply;
the electrode assembly further includes: the device comprises an adjusting support rod, an electrode mounting plate, a spherical adapter, a first transmission rod, a second transmission rod, a motor, a first transmission gear, a second transmission gear, a third transmission gear, a guide rail, a sliding block, a motor supporting seat and a cylinder;
one end of the adjusting support rod is connected with the test chamber, and the other end of the adjusting support rod is connected with the electrode protection cover; the positive electrode is arranged on the surface of one side of the electrode mounting plate, and the other side of the electrode mounting plate is connected with one end of the spherical adapter; a round through hole is formed in the middle of the electrode protection cover, and the spherical adapter is arranged at the round through hole in the middle of the electrode protection cover; one end of the second transmission rod is fixedly connected with the spherical adapter, and the other end of the second transmission rod penetrates through the first transmission rod and is connected with the second transmission gear; one end of the first transmission rod is fixedly connected with the electrode protection cover, and the other end of the first transmission rod is connected with the third transmission gear; the motor is connected with the first transmission gear; the motor is connected with the motor supporting seat through the guide rail and the sliding block; the air cylinder is fixedly arranged on the motor supporting seat; the first transmission gear is meshed with the second transmission gear and the third transmission gear respectively;
the electrode assembly control system is also used for controlling the extension and retraction of the air cylinder.
2. The flow field display device of claim 1, wherein the power supply is a high voltage dc power supply.
3. The flow field display device of claim 1, wherein the adjusting support rod is sleeved together at a middle position by two polished rods with different diameters to adjust the length of the adjusting support rod.
4. The flow field display device according to claim 1, wherein the positive electrode is a plurality of point electrodes, and the negative electrode comprises at least one of a point electrode, a line electrode, and a plane electrode.
5. The flow field display device according to claim 1, wherein the electrode protection cover is in any one of a square structure, a triangular structure and a disc structure, a circular through hole is formed in the middle of the electrode protection cover, and a limiting ring is arranged at the end of the circular through hole.
6. The flow field display device according to claim 1, wherein a threaded hole is formed in the middle of the spherical adapter to connect with the electrode mounting plate through a screw.
7. The flow field display device of claim 1, wherein a magnet is disposed on a side of the motor support base adjacent to the test chamber to enable quick connection with the test chamber.
8. The flow field display device according to claim 1, further comprising a motor base, wherein the cylinder comprises a cylinder rod, and wherein the cylinder rod is connected to the motor base via a flange.
9. The flow field display device according to claim 1, wherein the adjusting support rod, the electrode protecting cover, the electrode mounting plate, the spherical adapter, the first transmission rod, the second transmission rod, the first transmission gear, the second transmission gear and the third transmission gear are all made of polytetrafluoroethylene.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811306457.XA CN109238633B (en) | 2018-11-02 | 2018-11-02 | Flow field display device |
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| CN201811306457.XA CN109238633B (en) | 2018-11-02 | 2018-11-02 | Flow field display device |
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| CN109238633A CN109238633A (en) | 2019-01-18 |
| CN109238633B true CN109238633B (en) | 2020-06-09 |
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| CN111175010B (en) * | 2020-01-08 | 2020-09-25 | 中国空气动力研究与发展中心超高速空气动力研究所 | Large-caliber hypersonic-velocity low-density wind tunnel flow field display system based on high-frequency glow |
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