Particle injection test device for measuring jet velocity field

Abstract

The invention provides a particle injection test device for jet velocity field measurement, which comprises a particle generator, a nozzle connected with an air source is mounted in the particle generator, a tracer particle raw material is arranged at an air outlet port of the nozzle, and a pressure reducing valve and a switch assembly are sequentially arranged between the air source and the nozzle. An outlet of the particle generator is connected with the particle sowing relay tank through a second electric valve, an outlet of the particle sowing relay tank is connected with the jet flow device through an electric control valve, and a first pressure gauge and a second pressure gauge are arranged on the particle generator and the particle sowing relay tank respectively. The particle sowing relay tank is connected behind the particle generator to collect the tracer particles, so that the tracer particles can continuously, uniformly and stably reach the jet flow position, and the flow characteristics of the jet flow are fully reflected; and by arranging a pressure reducing valve and an electric control valve, the requirement of jet flow quantitative pressure control is met, and the tracer particles are evenly distributed in the jet flow process.

Description

Technical Field

[0001] The invention relates to the technical field of aerospace testing, and in particular to a particle injection testing device for measuring a jet velocity field. Background Art

[0002] For high-speed aircraft, at a specific flight altitude, the air density decreases, and the control torque generated by the aerodynamic rudder decreases significantly. In this environment, active jet control can provide stable and reliable control torque to make up for the lack of control efficiency of the rudder surface, and realize the attitude control and orbit control of the aircraft. Jet control technology is widely used, such as satellite orbit change, missile steering, etc., but under high-speed flow field conditions, the interference effect between the jet flow and the mainstream flow of the aircraft is very complex. Conventional force and pressure measurement methods can provide aerodynamic information of local discrete points, and the schlieren technology can provide approximate interference wave system and separation zone characteristics, but it cannot be quantified.

[0003] Particle image velocimetry (PIV) has the advantages of both dynamic display and measurement, and can obtain the quantitative velocity field of the flow. For PIV technology, the presence of tracer particles in the fluid being studied is essential. By taking particle images with a cross-frame camera and calculating the velocity field, the flow field characteristic parameters such as isovelocity lines, streamlines, and vorticity of the corresponding flow field can be calculated with the help of corresponding mathematical calculation software.

[0004] At present, under the existing high-speed, especially hypersonic flow conditions, the mainstream tracer particles have a wide spreading range, and the mainstream tracer particles reaching the jet position are scattered, which cannot fully reflect the jet flow characteristics; and the traditional tracer particle spreading method based on pressure control cannot meet the requirements of jet quantitative pressure control. The total pressure required for jet quantitative does not match the total spreading pressure of the particle generator, resulting in uneven distribution of tracer particles in the jet process.

[0005] Therefore, it is necessary to establish a particle injection test device for jet velocity field measurement, inject tracer particles into the jet flow, realize jet flow tracing, and provide more abundant and reliable velocity field measurement data for the flow interference measurement between the jet and the mainstream. Summary of the invention

[0006] The object of the present invention is to provide a particle injection test device for measuring jet velocity field to solve the above technical problems.

[0007] The present invention provides a particle injection test device for measuring a jet velocity field, comprising a particle generator, wherein a nozzle connected to an air source is installed in the particle generator, a tracer particle raw material is arranged at the air outlet of the nozzle, a pressure reducing valve and a switch assembly are arranged in sequence between the air source and the nozzle, the outlet of the particle generator is connected to a particle sowing relay tank through a second electric valve, the outlet of the particle sowing relay tank is connected to a jet device through an electric regulating valve, and a first pressure gauge and a second pressure gauge are respectively arranged on the particle generator and the particle sowing relay tank.

[0008] Furthermore, the gas source is connected to the nozzle via a pressure pipeline, and the pressure reducing valve and the switch assembly are installed on the pressure pipeline.

[0009] Furthermore, the pressure pipeline is provided with a third pressure gauge and a fourth pressure gauge at positions close to the inlet valve port and the outlet valve port of the pressure reducing valve, respectively.

[0010] Furthermore, the switch assembly includes a manual stop valve and a first electric valve, and the manual stop valve and the first electric valve are installed on the pressure pipeline.

[0011] Furthermore, the gas channel structure in the nozzle is conically contracted, and the raw material of the tracer particles is titanium dioxide powder.

[0012] Furthermore, a heating sleeve is provided on the particle generator, and an electric heating tube of the heating sleeve is arranged at a position close to the laying area of ​​the tracer particle raw material.

[0013] Furthermore, a heat insulation layer is provided on the outer wall of the heating sleeve.

[0014] Furthermore, the second electric valve is installed on the delivery pipeline.

[0015] Furthermore, the outlet of the particle spreading relay tank is connected to the inlet of the jet device through a jet pipe, and the electric regulating valve is installed on the jet pipe.

[0016] Furthermore, a fifth pressure gauge is installed on the jet pipe.

[0017] The present invention collects tracer particles by connecting a particle broadcasting relay tank after a particle generator, so that the tracer particles can reach the jet position continuously, evenly and stably, fully reflecting the jet flow characteristics; by arranging a pressure reducing valve and an electric regulating valve, the requirement of jet quantitative pressure control is met, so that the total pressure required for jet quantitative operation matches the total broadcasting pressure of the particle generator, ensuring that the tracer particles are evenly distributed during the jet process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the interior of the particle generator of the present invention;

[0021] Figure 3 It is a schematic diagram of the nozzle structure and internal structure of the present invention;

[0022] Description of reference numerals:

[0023] In the figure: 1-particle generator, 11-nozzle, 12-titanium dioxide powder, 13-first pressure gauge, 2-particle spreading relay tank, 21-second pressure gauge, 3-gas source, 31-pressure pipeline, 4-pressure reducing valve, 41-third pressure gauge, 42-fourth pressure gauge, 51-manual stop valve, 52-first electric valve, 6-transport pipeline, 61-second electric valve, 7-jet device, 8-jet pipeline, 81-electric regulating valve, 82-fifth pressure gauge, 9-heating bushing; DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example 1

[0028] like Figure 1-Figure 3 As shown:

[0029] A particle injection test device for measuring a jet velocity field comprises a particle generator 1, an inlet of the particle generator 1 is connected to a gas source 3.

[0030] The outlet of the particle generator 1 is connected to the particle sowing relay tank 2 , and the outlet of the particle sowing relay tank 2 is connected to the jet device 7 .

[0031] A nozzle 11 is installed in the particle generator 1 , and a tracer particle raw material is arranged at the gas outlet of the nozzle 11 . In this embodiment, the nozzle 11 is a conical contraction nozzle 11 , and the nozzle 11 is arranged at the bottom of the tank of the particle generator 1 .

[0032] The ratio of the inlet and outlet areas of the nozzle 11 is preferably in the range of 4-16, and the number of the nozzles 11 is determined according to the flow demand and the volume of the tank. In this embodiment, the ratio of the inlet and outlet areas of the nozzle 11 is 8.

[0033] The raw material of the tracer particles in this embodiment is titanium dioxide powder 12 , preferably titanium dioxide powder 12 with a median particle size of 50 nm-100 nm. The titanium dioxide powder 12 is laid on the bottom of the tank of the particle generator 1 , covering the nozzle 11 .

[0034] The particle generator 1 accelerates the airflow and shears and carries the tracer particles.

[0035] A first pressure gauge 13 for measuring the internal pressure value of the particle generator 1 is installed on the top of the particle generator 1 .

[0036] A second pressure gauge 21 for measuring the internal pressure value of the particle scattering relay tank 2 is installed on the top of the particle scattering relay tank 2 .

[0037] The nozzle 11 is connected to the gas source 3 through a pressure pipe 31. The pressure of the gas source 3 is not less than 5MPa, and can stably provide a gas flow of not less than 2kg / s, and the working medium is compressed air. The pressure design of the pressure pipe 31 is not less than the maximum pressure of the gas source 3.

[0038] The pressure pipe 31 is provided with a pressure reducing valve 4 and a switch assembly.

[0039] The pressure reducing valve 4 is used to adjust the gas pressure entering the particle generator 1. Preferably, the flow rate of the pressure reducing valve 4 is not less than 1 kg / s, and the output pressure is not less than 5 MPa.

[0040] The pressure pipe 31 is provided with a third pressure gauge 41 and a fourth pressure gauge 42 at positions near the inlet valve port and the outlet valve port of the pressure reducing valve 4, respectively. The third pressure gauge 41 is used to measure the gas pressure in the pipe before the pressure reducing valve 4, and the fourth pressure gauge 42 is used to measure the gas pressure after the pressure reducing valve 4 and transported into the particle generator 1.

[0041] The switch assembly includes a manual stop valve 51 and a first electric valve 52 , and the manual stop valve 51 and the first electric valve 52 are installed on the pressure pipe 31 .

[0042] In the present device, the manual stop valve 51 is a switch for manually controlling the airflow to enter the particle generator 1 , and the first electric valve 52 is a switch for remotely controlling the airflow to enter the tank of the particle generator 1 .

[0043] The manual stop valve 51 and the first electric valve 52 provide dual control to improve the safety of device operation.

[0044] The outlet of the particle generator 1 is connected to the inlet of the particle spreading relay tank 2 via a delivery pipe 6 , and a second electric valve 61 is installed on the delivery pipe 6 .

[0045] The outlet of the particle spreading relay tank 2 is connected to the inlet of the jet device 7 through a jet pipe 8, and an electric regulating valve 81 is installed on the jet pipe 8. A fifth pressure gauge 82 is installed on the jet pipe 8, and the fifth pressure gauge 82 measures and displays the airflow pressure adjusted by the electric regulating valve 81.

[0046] The electric regulating valve 81 is used to open and close the jet pipe 8. When the electric regulating valve 81 is opened, the airflow with tracer particles in the particle seeding relay tank 2 is adjusted to a specified pressure and the airflow with tracer particles can reach the jet device 7 continuously, evenly and stably.

[0047] A heating sleeve 9 is arranged on the outer wall of the particle generator 1, and a disc-type electric heating pipe is arranged on the inner wall of the heating sleeve 9. The electric heating pipe is arranged near the area where the titanium dioxide powder 12 is laid. A heat insulating layer is arranged outside the heating sleeve 9.

[0048] The heating sleeve 9 is a heating device for ensuring that the tracer particle raw material in the particle generator 1 remains dry. When the particle generator 1 containing the tracer particle raw material is not working, the heating sleeve 9 is heated to 50-100°C to gradually precipitate moisture from the tracer particle raw material.

[0049] When the device is working:

[0050] In the first stage, the second electric valve 61 is opened and the electric regulating valve 81 is closed. The gas source 3 is opened, the airflow enters the pressure pipe 31, the pressure reducing valve 4 is adjusted to the specified pressure, the manual stop valve 51 is opened, and the first electric valve 52 is remotely controlled to open. The airflow provided by the gas source 3 enters the nozzle 11 of the particle generator 1, and the airflow is ejected from the nozzle 11 and mixed with the highly dispersed submicron titanium dioxide powder 12. Under the continuous supply of the gas source 3, the airflow with tracer particles converges and enters the particle seeding relay tank 2. After reaching a certain particle concentration and airflow pressure, the electric switch valve 10 is closed, and the upstream equipment no longer works. The appropriate particle concentration needs to be determined according to the specific test requirements.

[0051] In order to obtain a uniformly mixed tracer particle airflow mixture, it is necessary to control the ratio of the pressure P1 of the particle generator 1 and the pressure P2 of the particle seeding relay tank 2. P1 is monitored and displayed by the first pressure gauge 13 of the particle generator 1, and P2 is monitored and displayed by the second pressure gauge 21 of the particle seeding relay tank 2. Preferably, the initial pressure ratio RC (P1 / P2) is not less than 30:1, and the final pressure ratio RZ (P1 / P2) is not less than 1.5:1.

[0052] In the second stage, the second electric valve 61 is closed and the electric regulating valve 81 is opened. The electric regulating valve 81 is opened, and the airflow with the tracer particles enters the jet device 7; the output airflow pressure of the electric regulating valve 81 is adjusted, and the airflow pressure output by the electric regulating valve 81 is monitored and displayed by the fifth pressure gauge 82. After the electric regulating valve 81 is adjusted to the specified pressure, the flow field tracer of the jet flow is realized.

[0053] The present invention collects tracer particles by connecting a particle broadcasting relay tank after a particle generator, so that the tracer particles can reach the jet position continuously, evenly and stably, fully reflecting the jet flow characteristics; by arranging a pressure reducing valve and an electric regulating valve, the requirement of jet quantitative pressure control is met, so that the total pressure required for jet quantitative operation matches the total broadcasting pressure of the particle generator, ensuring that the tracer particles are evenly distributed during the jet process.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A particle injection test device for measuring jet velocity field, characterized in that It comprises a particle generator, wherein a nozzle connected to an air source is installed in the particle generator, a tracer particle raw material is arranged at the air outlet of the nozzle, a pressure reducing valve and a switch assembly are arranged in sequence between the air source and the nozzle, the outlet of the particle generator is connected to a particle sowing relay tank through a second electric valve, the outlet of the particle sowing relay tank is connected to a jet device through an electric regulating valve, and a first pressure gauge and a second pressure gauge are respectively arranged on the particle generator and the particle sowing relay tank.

2. The particle injection test device for measuring jet velocity field according to claim 1, characterized in that: The gas source is connected to the nozzle via a pressure pipeline, and the pressure reducing valve and the switch assembly are installed on the pressure pipeline.

3. The particle injection test device for measuring jet velocity field according to claim 2, characterized in that: The pressure pipeline is provided with a third pressure gauge and a fourth pressure gauge at positions close to the inlet valve port and the outlet valve port of the pressure reducing valve, respectively.

4. The particle injection test device for measuring jet velocity field according to claim 2, characterized in that: The switch assembly comprises a manual stop valve and a first electric valve, and the manual stop valve and the first electric valve are installed on the pressure pipeline.

5. The particle injection test device for measuring jet velocity field according to claim 1, characterized in that: The gas channel structure in the nozzle is in a conical contraction shape, and the raw material of the tracer particles is titanium dioxide powder.

6. The particle injection test device for measuring jet velocity field according to claim 1, characterized in that: The particle generator is provided with a heating sleeve, and the electric heating tube of the heating sleeve is arranged at a position close to the laying area of ​​the tracer particle raw material.

7. The particle injection test device for measuring jet velocity field according to claim 6, characterized in that: A heat insulation layer is arranged on the outer wall of the heating sleeve.

8. The particle injection test device for measuring jet velocity field according to claim 1, characterized in that: The outlet of the particle generator is connected to the inlet of the particle seeding relay tank through a delivery pipeline, and the second electric valve is installed on the delivery pipeline.

9. The particle injection test device for measuring jet velocity field according to claim 1, characterized in that: The outlet of the particle spreading relay tank is connected to the inlet of the jet device through a jet pipeline, and the electric regulating valve is installed on the jet pipeline.

10. The particle injection test device for measuring jet velocity field according to claim 9, characterized in that: A fifth pressure gauge is installed on the jet pipeline.

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