CN102435769A - Method and device for spreading trace particles in supersonic PIV (Particle Image Velocimetry) flow field testing experiment - Google Patents
Method and device for spreading trace particles in supersonic PIV (Particle Image Velocimetry) flow field testing experiment Download PDFInfo
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Abstract
The invention relates to a method and a device for spreading trace particles in a supersonic PIV (Particle Image Velocimetry) flow field testing experiment. The trace particles are charged by using vacuum suction in a supersonic wind tunnel high-pressure high-temperature large-flow flow field environment, the trace particles are stored in a particle generator before the experiment, after a gas flow is injected, the gas flow and the trace particles are sufficiently mixed, pass through a high-pressure pipeline, are spread by a particle spreader and then enter a wind tunnel pipeline, the trace particles are uniformly spread under the condition of a high-Mach-number flow, and the trace particles are tested through a particle image velocity-measuring system. Compared with the prior art, the method and the device provided by the invention realize that the PIV trace particles are charged and uniformly spread in a high-pressure high-temperature large-flow flow field ambient condition, the probable agglomeration phenomenon of the trace particles in the injection process is effectively avoided, precise sequence control between a PIV system and wind tunnel operation is guaranteed, and the testing scheme corresponding to the spreading concentration satisfying the PIV operation requirement is determined.
Description
Technical field
The present invention relates to the wind tunnel technique of aerospace field, especially relate to the method and the device that dispense trace particle in the experiment of supersonic speed PIV flow-field test.
Background technology
Along with space technology and hypersonic weaponry technology rapid development; Ultra/hypersonic compressible mobile research and relevant experiment test technology are paid attention to greatly and are developed, particularly the measuring technology of the quantification velocity field of high-accuracy high-resolution distribution.
Particle image velocimetry technology (PIV) application facet that tests the speed in the flow field has had significant progress in recent years; It breaks through traditional spot measurement restriction; Velocity distribution in can instantaneous noncontacting measurement flow field on cross section; And higher measuring accuracy is arranged, flow such as supersonic jet, shear layer, stream and adhere in the hypersonic flow field measurements such as shock wave and cylinder detached shock wave such as corner flow, wedge and to have obtained good measurement result in the ultra-combustion ramjet.
Ultra/as hypersonicly to flow that to be different from the low speed distinguishing feature that flows be shock wave phenomena.Shock wave can cause forming the zone that a flow velocity is a significant slowdown at model surface; Boundary layer and shear layer are relatively very thin, and the compressible mobile velocity field of PIV technical testing high speed has been brought challenge: guarantee in the measurement face that trace particle concentration evenly and satisfy the PIV test request.Therefore the selected particle homogeneity scheme of dispensing preferably is that PIV using ultrasound speed flows the key issue of research as one of supersonic speed PIV measuring technology development key technology, how to realize that trace particle evenly dispenses and concentration satisfies the concern that the PIV trace particle technology of dispensing that the PIV Flame Image Process requires obtains numerous researchers under study for action.
Summary of the invention
The object of the invention is exactly for the defective that overcomes above-mentioned prior art existence method and the device that dispenses trace particle in a kind of supersonic speed PIV experiment to be provided; But make supersonic speed PIV trace particle dispense system's manual control or Long-distance Control and real-time response; Dispense and to avoid and to reduce trace particle in the process and gather a phenomenon; And can obtain the good image of distribution of particles effect, computing can obtain comparatively desirable flow field vector distribution plan through PIV.
The object of the invention can be realized through following technical scheme:
Dispense the method for trace particle in the supersonic speed PIV experiment; Under the environment of the big flow of supersonic wind tunnel HTHP flow field, utilize vacuum to suck and realize the trace particle filling; It is characterized in that; This method may further comprise the steps: trace particle is stored in the particle generator before the experiment; Air-flow and trace particle fully mix through pressure duct and dispense device through particle and dispense the laggard wind-tunnel pipeline of going into after open injecting air-flow, and trace particle dispenses evenly under the high Mach number inlet flow conditions, and system tests trace particle through particle image velocimetry.
Injection air-flow in the described particle generator adopts annular high pressure finedraw spray mode, make the air-flow spray evenly and the trace particle powder that is easy to carry about with one go out generator.
Regulate the array mode that particle generator injects the air flow meter flow value and changes the shut-off valve assemblies on the particle generator, the trace particle that obtains suitable PIV Flame Image Process under different air flow rates and the pressure condition dispenses concentration and flow.
Air pressure is to closing on vacuum state between the preceding need of unlatching wind-tunnel balance test section, stable section and vacuum sphere.Open valve made particle generator also reach and closed on vacuum state this moment.The trace particle powder that when opening duct valve and closing the pressure duct valve, is contained in the particle jar can be inhaled in the generator tank body fast, and the particle volt is waited for the experiment beginning in the particle generator tank base behind the closure catheter for closing valve.Propose and realization vacuum suction particle dosing method, can significantly reduce trace particle and contact the phenomenon that group is gathered in the back with humid air, and can reduce the number of times of dismounting particle generator port, obviously improved the trace particle injection efficiency.
Dispense the device of trace particle in the supersonic speed PIV experiment, comprising:
Particle generator: store trace particle, be connected with the particle jar through airtight pipeline;
Particle dispenses device: be arranged between the wind-tunnel stable section upper reaches and the well heater downstream, be connected with particle generator through airtight pipeline.
Described particle generator injects airflow pipeline by lower port and high pressure and is connected, and stop valve and two flowmeters are installed on the pipeline, and flowmeter group scalable high pressure draught flow is closed in the circulation of stop valve control high pressure gas.Trace particle stores in the particle jar before the experiment, utilizes the vacuum inhalation method to get into particle generator through conduit, stop valve and port then, and a jar internal pressure reads through tensimeter.Particle generator is fixed by stent support.During experiment stop valve is opened, high pressure draught carry well-mixed trace particle through pressure duct, dispense pipe and particle and dispense device and inject wind-tunnel, and with the even blending of wind-tunnel main flow and do not influence each flow parameter of wind-tunnel.
Utilize the vacuum tightness after particle generator and the wind-tunnel stable section balance that trace particle is sucked in the particle generator.High pressure injects air-flow and gets into particle generator by lower port; Pipeline is by mode spray in the form of a ring between fastening group of guiding in lower end guiding, guide housing; From bottom to top impact the trace particle powder be positioned at the bottom of the generator jar, and powder is injected wind-tunnel through the generator port uniformly.Lower port realizes high pressure sealing through port pressure cap and inner sealing device, can the high pressure of anti-20MPa.
Particle generator dispense the pipe in air current spray nozzle be supersonic nozzle, high pressure draught through nozzle, dispense a mouthful entering wind-tunnel pipeline.Dispensing mouthful diameter is 1mm.Dispense tube material and select SS321 for use, can the high pressure of anti-16MPa.
The pipe endpiece that dispenses that described particle dispenses in the device adopts supersonic nozzle, and opening direction is parallel to the wind-tunnel main flow and comes flow path direction.
This device can realize that the switching of manual control or Long-distance Control also can real-time response.
Compared with prior art, the present invention dispenses flow and concentration through the trace particle that strength and the valve member array mode of regulating trace particle and injecting air-flow obtained to adapt to different incoming flow Mach numbers and different flow; Propose to utilize the vacuum tightness after particle generation tank and the wind-tunnel stable section balance that trace particle is sucked into the particle method for implanting in the generator jar, effectively avoided trace particle contingent phenomenon of gathering in injection process; Through selected experiment test flow process sequential, guaranteed accurate sequential control between PIV system and the wind tunnel operation; Through compare test particle generator injection pressure particle is dispensed the influence of concentration, that has confirmed to satisfy PIV computing requirement dispenses the pairing testing scheme of concentration.
Description of drawings
Fig. 1 is the arrangement synoptic diagram of this device;
Fig. 2 is the structural representation of this device;
Fig. 3 is a particle generator lower port structural representation;
Fig. 4 dispenses the tubular construction synoptic diagram for particle generator.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment
The on-the-spot arrangement of supersonic speed PIV is shown in Figure 1 as illustrating among the present invention; A is the Laboratory Module of supersonic wind tunnel among the figure; B is the PIV system; C is the wind-tunnel stable section, is respectively trace particle shown in D, F, the G and dispenses particle in the system and dispense device (comprising that particle dispenses pipeline), particle generator and generator and inject airflow pipeline, and E is a wind-tunnel main flow pipeline.Particle dispenses device D and is arranged between the wind-tunnel stable section upper reaches and the well heater downstream, and particle generator F is used for trace particle and high pressure and injects that air-flow G mixes and carry entering wind-tunnel main flow pipeline by its impact.
The device that dispenses trace particle among the present invention in the supersonic speed PIV experiment is as shown in Figure 2; Particle generator 5 injects airflow pipeline 1-1 by lower port 4 and high pressure and is connected; Stop valve 2-1 and two flowmeter 3-1, flowmeter 3-2 are installed on the pipeline; Flowmeter group scalable high pressure draught flow is closed in the circulation of stop valve control high pressure gas.Trace particle stores in particle jar 9 before the experiment, utilizes the vacuum inhalation method to get into particle generator 5 through conduit 1-2, stop valve 2-2 and port 6 then, and a jar internal pressure reads through tensimeter 8.Particle generator 5 is by support 7 support fixation.During experiment stop valve 2-3, stop valve 2-4 are opened; High pressure draught carry well-mixed trace particle through pressure duct 1-3, pressure duct 1-4, dispense pipe 10-1, dispense pipe 10-2 and dispense device 11 and inject wind-tunnel, and with the even blending of wind-tunnel main flow and do not influence each flow parameter of wind-tunnel.
Particle generator lower port structure among the present invention is as shown in Figure 3; High pressure injects air-flow and gets into particle generator by lower port 31; Pipeline is by fastening group of 35 the mode sprays in the form of a ring of leading in lower end guiding 33, guide housing 34; From bottom to top impact the trace particle powder be positioned at the bottom of the generator jar, and powder is injected wind-tunnel through the generator port uniformly.Lower port realizes high pressure sealing through port pressure cap 32 and inner sealing device, can the high pressure of anti-20MPa.
It is as shown in Figure 4 that particle generator among the present invention dispenses tubular construction, dispenses that air current spray nozzle 42 is supersonic nozzle in the pipe, high pressure draught through nozzle, dispense mouthfuls 41 and get into wind-tunnel pipelines.Dispensing mouthful diameter is 1mm.Dispense tube material and select SS321 for use, can the high pressure of anti-16MPa.
Air pressure is to closing on vacuum state between the preceding need of unlatching wind-tunnel balance test section, stable section and vacuum sphere.Open stop valve 2-3, stop valve 2-4 this moment, makes particle generator also reach and close on vacuum state.The trace particle powder that when opening catheter cutoff valve 2-2 and closing pressure duct stop valve 2-3, stop valve 2-4, is contained in the particle jar can be inhaled in the generator tank body fast; The particle volt is waited for the experiment beginning in the particle generator tank base behind the closure catheter for closing stop valve 2-2.Propose and realization vacuum suction particle dosing method, can significantly reduce trace particle and contact the phenomenon that group is gathered in the back with humid air, and can reduce the number of times of dismounting particle generator port, obviously improved the trace particle injection efficiency.
According to the wind tunnel operation parameter, table 1 has provided selected injection pressure and pairing trace particle flow and wind-tunnel main flow flow under Mach number 4.0 and 7.0 experiment conditions.Utilize PIV software to the image gathered to carrying out computing cross-correlation, the flow field vector is evenly distributed and can fully reflects the shock wave structure characteristic.When particle flow is 0.01kg/s and main flow flow when being 3.1kg/s, can estimate that according to particle density and incoming flow flow velocity the particle concentration that obtains in the experimental section is 100,000/mm
3, therefore can satisfy each interpretation sub-district has 10 particles to exist, and meets the requirement of PIV computing cross-correlation.
Table 1 trace particle injection pressure and flow parameter
Dispense the method for trace particle in the supersonic speed PIV experiment; Under the environment of the big flow of supersonic wind tunnel HTHP flow field, utilize vacuum to suck and realize the trace particle filling; Trace particle is stored in the particle generator before the experiment; Air-flow and trace particle fully mix through pressure duct and dispense device through particle and dispense the laggard wind-tunnel pipeline of going into after open injecting air-flow, and trace particle dispenses evenly under the high Mach number inlet flow conditions, and system tests trace particle through particle image velocimetry.
Injection air-flow in the particle generator adopts annular high pressure finedraw spray mode, make the air-flow spray evenly and the trace particle powder that is easy to carry about with one go out generator.Regulate the array mode that particle generator injects the air flow meter flow value and changes the shut-off valve assemblies on the particle generator, the trace particle that obtains suitable PIV Flame Image Process under different air flow rates and the pressure condition dispenses concentration and flow.
Air pressure is to closing on vacuum state between the preceding need of unlatching wind-tunnel balance test section, stable section and vacuum sphere.Open valve made particle generator also reach and closed on vacuum state this moment.The trace particle powder that when opening duct valve and closing the pressure duct valve, is contained in the particle jar can be inhaled in the generator tank body fast, and the particle volt is waited for the experiment beginning in the particle generator tank base behind the closure catheter for closing valve.Propose and realization vacuum suction particle dosing method, can significantly reduce trace particle and contact the phenomenon that group is gathered in the back with humid air, and can reduce the number of times of dismounting particle generator port, obviously improved the trace particle injection efficiency.
Claims (9)
1. dispense the method for trace particle in the experiment of supersonic speed PIV flow-field test; Under the environment of the big flow of supersonic wind tunnel HTHP flow field, utilize vacuum to suck and realize the trace particle filling; It is characterized in that; This method may further comprise the steps: trace particle is stored in the particle generator before the experiment; Air-flow and trace particle fully mix through pressure duct and dispense device through particle and dispense the laggard wind-tunnel pipeline of going into after open injecting air-flow, and trace particle dispenses evenly under the high Mach number inlet flow conditions, and system tests trace particle through particle image velocimetry.
2. dispense the method for trace particle in the supersonic speed PIV flow-field test experiment according to claim 1; It is characterized in that; Injection air-flow in the described particle generator adopts annular high pressure finedraw spray mode, make the air-flow spray evenly and the trace particle powder that is easy to carry about with one go out generator.
3. dispense the method for trace particle in the supersonic speed PIV flow-field test experiment according to claim 1; It is characterized in that; Regulate the array mode that particle generator injects the air flow meter flow value and changes the shut-off valve assemblies on the particle generator, the trace particle that obtains suitable PIV Flame Image Process under different air flow rates and the pressure condition dispenses concentration and flow.
4. dispense the method for trace particle in the supersonic speed PIV flow-field test experiment according to claim 1; It is characterized in that; Need before the test that air pressure utilizes the vacuum state in particle generator this moment from the particle jar, to suck in the particle generator trace particle subsequent use fast to closing on vacuum state between equilibrium particle generator, experimental section, stable section and vacuum sphere.
5. dispense the device of trace particle in the experiment of supersonic speed PIV flow-field test, it is characterized in that this device comprises:
Particle generator: store trace particle, be connected with the particle jar through airtight pipeline;
Particle dispenses device: be arranged between the wind-tunnel stable section upper reaches and the well heater downstream, be connected with particle generator through airtight pipeline.
6. dispense the device of trace particle in the supersonic speed PIV flow-field test experiment according to claim 5; It is characterized in that; Described particle generator is provided with stop valve, tensimeter and flowmeter, through regulating the flow that stop valve and flowmeter control trace particle injects air-flow.
7. dispense the device of trace particle in the supersonic speed PIV flow-field test according to claim 5 experiment, it is characterized in that, utilize the vacuum tightness after particle generator and the wind-tunnel stable section balance that trace particle is sucked in the particle generator.
8. dispense the device of trace particle in the supersonic speed PIV flow-field test experiment according to claim 5, it is characterized in that, the pipe endpiece that dispenses that described particle dispenses in the device adopts supersonic nozzle, and opening direction is parallel to the wind-tunnel main flow and comes flow path direction.
9. dispense the device of trace particle in the supersonic speed PIV flow-field test experiment according to claim 5, it is characterized in that, this device can realize that the switching of manual control or Long-distance Control also can real-time response.
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