CN110095246B - Shooting system for shooting flow field structure in wind tunnel test and test system - Google Patents
Shooting system for shooting flow field structure in wind tunnel test and test system Download PDFInfo
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- CN110095246B CN110095246B CN201910480461.6A CN201910480461A CN110095246B CN 110095246 B CN110095246 B CN 110095246B CN 201910480461 A CN201910480461 A CN 201910480461A CN 110095246 B CN110095246 B CN 110095246B
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
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Abstract
The invention provides a shooting system and a test system for shooting a flow field structure in a wind tunnel test, which comprises a multi-cavity laser and a shooting device, wherein the multi-cavity laser is used for outputting laser pulses to a wind tunnel test section to illuminate a flow field in the wind tunnel test section and enabling tracing particles in the flow field to emit scattered light, the shooting device is used for utilizing the scattered light to expose and image to shoot the flow field structure, the multi-cavity laser comprises a plurality of double-cavity lasers, the double-cavity lasers output laser pulses with different wavelengths respectively, the shooting device comprises a plurality of cross-frame cameras, the cross-frame cameras and the double-cavity lasers are arranged in a one-to-one correspondence mode, the input end of each cross-frame camera is provided with a filtering component used for passing light with specific wavelengths, the wavelengths of the light which can pass through the filtering component are the same as the wavelengths of the laser pulses output by the corresponding double-cavity lasers, and the shooting system further comprises a plurality of cross-frame cameras which are connected with the double-cavity lasers and and a synchronous controller for the sequence.
Description
Technical Field
The invention relates to the technical field of wind tunnel tests, in particular to a shooting system for shooting a flow field structure in a wind tunnel test. In addition, the invention also relates to a test system comprising the shooting system.
Background
The supersonic and hypersonic wind tunnel has complicated flow field structure, short characteristic time, violent pulsation and obvious unsteady characteristic. The flow field structures of the supersonic and hypersonic wind tunnels are measured, images of a plurality of flow field structures need to be shot in the test process, and the time intervals of the images need to be capable of ensuring that the evolution characteristics of the flow field structures along with time are captured, namely the time intervals of adjacent images need to be in the same order of magnitude as the characteristic time (hundred nanosecond order) of the flow field structures.
The frame-crossing camera can continuously expose twice in a short time interval (in the order of hundreds of nanoseconds), can shoot two images with the time interval of hundreds of nanoseconds, and the resolution ratio of the images can reach more than 2k x 2 k. However, due to the hardware performance limitations of the frame-crossing camera, the exposure time of the second frame image of the frame-crossing camera is currently in the order of milliseconds. If a plurality of frame-crossing cameras are directly connected in parallel, a synchronous controller sends out a control signal, and after a certain time delay (the time delay is an inherent parameter and can be obtained through measurement), a laser outputs laser pulses, so that the frame-crossing cameras perform exposure imaging.
As shown in fig. 1, t represents the time delay, a represents the timing of the synchronous controller sending out the control signal, b represents the timing of the laser output laser pulse, and c represents the timing of the cross-frame camera exposure imaging. The time interval of the laser pulse output by the laser is hundreds of nanoseconds, which is far shorter than the exposure time of the second frame image of the frame-crossing camera. While the laser outputs the third laser pulse, the second frame image of the first cross-frame camera is still exposed. This results in multiple laser pulses during the exposure of the second frame image of the first cross-frame camera, which results in the second frame image of the first cross-frame camera being overexposed and unusable, and similarly, the second frame images of the remaining cross-frame cameras are unusable.
Disclosure of Invention
The invention provides a shooting system and a test system for shooting a flow field structure in a wind tunnel test, which aim to solve the problem that a second frame image of a cross-frame camera in the wind tunnel test is over-exposed and cannot be used.
The technical scheme adopted by the invention is as follows:
the invention provides a shooting system for shooting a flow field structure in a wind tunnel test, which comprises a multi-cavity laser and a shooting device, wherein the multi-cavity laser is used for outputting laser pulses to a wind tunnel test section to illuminate a flow field in the wind tunnel test section and enabling tracing particles in the flow field to emit scattered light, the shooting device is used for utilizing the scattered light to expose and image to shoot the flow field structure, the multi-cavity laser comprises a plurality of double-cavity lasers, the double-cavity lasers respectively output laser pulses with different wavelengths, the shooting device comprises a plurality of cross-frame cameras, the cross-frame cameras and the double-cavity lasers are arranged in a one-to-one correspondence mode, the input end of each cross-frame camera is provided with a light filtering component used for passing light with specific wavelengths, the wavelengths of the light which can pass through the light filtering component are the same as the wavelengths of the laser pulses output by the corresponding double-cavity lasers, and the shooting system further comprises a plurality of cross-frame cameras which are respectively connected with the double-cavity lasers And a synchronous controller.
Furthermore, the output end of the double-cavity laser is provided with a frequency doubling and beam combining component for frequency doubling and beam combining of the laser pulses output by the double-cavity laser.
Furthermore, the frequency doubling and beam combining component comprises a frequency doubling crystal and a beam combining light path, wherein the frequency doubling crystal is arranged at the output end of the double-cavity laser and is used for frequency doubling of laser pulses output by the double-cavity laser, and the beam combining light path is arranged at the output end of the frequency doubling crystal and is used for beam combining of the laser pulses output by the frequency doubling crystal.
Furthermore, the output end of the beam combining light path is provided with a sheet light assembly used for shaping the laser pulse output by the beam combining light path.
Furthermore, the shooting device also comprises a light splitting component which is arranged at the input end of the light filtering component and used for dispersing the light to the light filtering component, and a lens which is arranged at the input end of the light splitting component and used for gathering the light to the light splitting component.
Further, the light splitting assembly includes a light splitting pyramid disposed at an output end of the lens and configured to split the light into a plurality of beams of light, and a reflecting mirror disposed between the output end of the light splitting pyramid and an input end of the filtering assembly and configured to reflect the plurality of beams of light to the corresponding filtering assembly.
The invention also provides a test system for shooting the flow field structure in the wind tunnel test, which comprises a wind tunnel test section for forming a flow field by airflow flowing, a tracer particle input device communicated with the input end of the wind tunnel test section and used for inputting tracer particles into the wind tunnel test section, and a shooting system for shooting the flow field structure in the wind tunnel test section, wherein the shooting system adopts the shooting system for shooting the flow field structure in the wind tunnel test.
Further, the trace particle input device comprises a gas cylinder for outputting gas and a particle generator which is respectively communicated with the output end of the gas cylinder and the input end of the wind tunnel test section and is used for generating trace particles and enabling the trace particles to flow into the wind tunnel test section along with the gas.
Furthermore, a window is formed in the wind tunnel test section, a light guide arm which is used for extending to the window and aligning the window to output laser pulses into the wind tunnel test section is arranged on the multi-cavity laser of the shooting system, and a lens of a shooting device of the shooting system is aligned with the window.
Furthermore, the test system also comprises a computer which is respectively connected with the shooting device and the synchronous controller of the shooting system and is used for collecting images shot by the shooting device and controlling the synchronous controller to work.
The invention has the following beneficial effects:
the invention discloses a shooting system for shooting a flow field structure in a wind tunnel test. The multi-cavity laser includes a plurality of dual-cavity lasers having two cavities for outputting laser light, and is capable of continuously outputting two laser pulses at a very short time interval (in the order of hundreds of nanoseconds). The pulse time sequence of the double-cavity laser (namely the sequence and the time interval of the laser pulses output by the double-cavity lasers) is controlled by the synchronous controller, so that the multi-cavity laser can continuously output a plurality of laser pulses at very short time intervals (in the order of hundreds of nanoseconds), and the number of the laser pulses is the same as that of the cavities of the multi-cavity laser. Because the wavelengths of the laser pulses output by each double-cavity laser are different, the laser pulses with different wavelengths illuminate the flow field in the wind tunnel test section, and trace particles in the flow field emit scattered light with different wavelengths. The shooting device comprises a plurality of frame-crossing cameras, the frame-crossing cameras are arranged in one-to-one correspondence with the double-cavity laser, and the input end of each frame-crossing camera is provided with a light filtering component. The synchronous controller sends out a control signal, after a certain time delay, the double-cavity laser outputs laser pulses according to a specific pulse time sequence, and the frame-crossing camera performs exposure imaging according to a specific exposure time sequence (namely the sequence and time interval of exposure imaging performed by a plurality of frame-crossing cameras). Because the filter assembly can only pass light with a specific wavelength, and the wavelength of the light which can be passed by the filter assembly is the same as the wavelength of the laser pulse output by the corresponding double-cavity laser. First, a first double-cavity laser outputs two laser pulses, and the laser pulses pass through a corresponding first filtering component and are exposed on a corresponding first frame-crossing camera to obtain two images. And then, the second double-cavity laser outputs two laser pulses, although the second frame image of the first cross-frame camera is still exposed at the moment, the two laser pulses cannot be exposed and imaged on the first cross-frame camera because the two laser pulses cannot pass through the first filtering component, and can only be exposed and imaged on the corresponding second cross-frame camera through the corresponding second filtering component, and so on, thereby avoiding the second frame image of each cross-frame camera from being overexposed. Laser pulses are output into the wind tunnel test section through the multi-cavity laser to illuminate a flow field in the wind tunnel test section, and scattered light emitted by tracer particles in the flow field is utilized by the shooting device to expose and image, so that a flow field structure is shot. Because the time interval of the laser pulses output by the multi-cavity laser is very short, and the exposure time interval of the frame-crossing camera is in the order of hundreds of nanoseconds, the shot image of the flow field structure can reflect the time evolution process of the flow field structure, and can be used for analyzing and calculating the time evolution characteristic of the flow field structure.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a timing diagram illustrating operation of a conventional camera system;
FIG. 2 is one of schematic diagrams of a photographing system for photographing a flow field structure in a wind tunnel test according to a preferred embodiment of the present invention;
FIG. 3 is a second schematic diagram of a photographing system for photographing a flow field structure in a wind tunnel test according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of a test system for imaging flow field structures in wind tunnel tests according to a preferred embodiment of the present invention;
fig. 5 is a schematic operation timing diagram of a photographing system for photographing a flow field structure in a wind tunnel test according to a preferred embodiment of the present invention.
Description of reference numerals:
1. a wind tunnel test section; 11. a window; 21. a gas cylinder; 22. a particle generator; 31. a multi-cavity laser; 311. a dual-cavity laser; 312. a frequency doubling and beam combining component; 3121. frequency doubling crystals; 3122. a beam combining light path; 313. a sheet light assembly; 314. a light guide arm; 32. a photographing device; 321. a frame-crossing camera; 322. a filter assembly; 323. a light splitting component; 3231. a light splitting pyramid; 3232. a mirror; 324. a lens; 33. a synchronization controller; 4. and (4) a computer.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a timing diagram illustrating operation of a conventional camera system; FIG. 2 is one of schematic diagrams of a photographing system for photographing a flow field structure in a wind tunnel test according to a preferred embodiment of the present invention; FIG. 3 is a second schematic diagram of a photographing system for photographing a flow field structure in a wind tunnel test according to a preferred embodiment of the present invention; FIG. 4 is a schematic diagram of a test system for imaging flow field structures in wind tunnel tests according to a preferred embodiment of the present invention; fig. 5 is a schematic operation timing diagram of a photographing system for photographing a flow field structure in a wind tunnel test according to a preferred embodiment of the present invention.
As shown in fig. 2 and fig. 3, the photographing system for photographing a flow field structure in a wind tunnel test according to this embodiment includes a multi-cavity laser 31 for outputting laser pulses into a wind tunnel test section 1 to illuminate a flow field in the wind tunnel test section 1 and make tracing particles in the flow field emit scattered light, and a photographing device 32 for exposing and imaging by using the scattered light to photograph the flow field structure, where the multi-cavity laser 31 includes a plurality of dual-cavity lasers 311, the plurality of dual-cavity lasers 311 respectively output laser pulses with different wavelengths, the photographing device 32 includes a plurality of frame-crossing cameras 321, the frame-crossing cameras 321 and the dual-cavity lasers 311 are arranged in a one-to-one correspondence manner, an input end of each frame-crossing camera 321 is provided with a filtering component 322 for passing light with a specific wavelength, the wavelength of light that can pass through the filtering component 322 is the same as the wavelength of the laser pulses output by the corresponding dual-cavity laser 311, and the photographing system further includes a plurality of dual-cavity lasers 311 and a plurality of frame- A synchronous controller 33 for the pulse timing of the cavity laser 311 and the exposure timing of the frame-crossing camera 321.
The invention discloses a shooting system for shooting a flow field structure in a wind tunnel test, which comprises a multi-cavity laser 31, a shooting device 32 and a synchronous controller 33. The multi-cavity laser 31 includes a plurality of dual-cavity lasers 311, and the dual-cavity lasers 311 have two cavities for outputting laser light, and are capable of outputting two laser light pulses consecutively at short time intervals (on the order of hundreds of nanoseconds). By controlling the pulse timing of the dual-cavity laser 311 (i.e. the sequence and time interval of the laser pulses output by the multiple dual-cavity lasers 311) by the synchronous controller 33, the multiple-cavity laser 31 can continuously output multiple laser pulses at very short time intervals (in the order of hundreds of nanoseconds), and the number of the laser pulses is the same as that of the cavities of the multiple-cavity laser 31. Because the wavelengths of the laser pulses output by each dual-cavity laser 311 are different, the laser pulses with different wavelengths illuminate the flow field in the wind tunnel test section 1, and trace particles in the flow field emit scattered light with different wavelengths. The photographing device 32 includes a plurality of frame-crossing cameras 321, the frame-crossing cameras 321 are arranged corresponding to the dual-cavity lasers 311 one by one, and an input end of each frame-crossing camera 321 is provided with a filtering component 322. The synchronous controller 33 sends out a control signal, and after a certain delay, the dual-cavity laser 311 outputs laser pulses according to a specific pulse timing sequence, so that the frame-crossing cameras 321 perform exposure imaging according to a specific exposure timing sequence (i.e., the sequence and time interval of exposure imaging performed by the frame-crossing cameras 321). Since the filter element 322 can only pass light with a specific wavelength, the wavelength of the light passed by the filter element 322 is the same as the wavelength of the laser pulse output by the corresponding dual-cavity laser 311. First, the first dual-cavity laser 311 outputs two laser pulses, and the laser pulses pass through the corresponding first filter module 322 and are exposed on the corresponding first frame-crossing camera 321 to obtain two images. Next, the second dual cavity laser 311 outputs two laser pulses, and although the second frame image of the first cross frame camera 321 is still exposed, the two laser pulses cannot be exposed and imaged on the first cross frame camera 321 because they cannot pass through the first filtering component 322, and can only be exposed and imaged on the corresponding second cross frame camera 321 through the corresponding second filtering component 322, and so on, so as to avoid overexposure of the second frame image of each cross frame camera 321. Laser pulses are output into the wind tunnel test section 1 through the multi-cavity laser 31 to illuminate a flow field in the wind tunnel test section 1, and scattered light emitted by tracer particles in the flow field is utilized by the shooting device 32 to expose and image, so that the flow field structure is shot. Because the time interval of the laser pulses output by the multi-cavity laser 31 is short and the exposure time interval of the frame-crossing camera 321 is in the order of hundreds of nanoseconds, the shot image of the flow field structure can reflect the time evolution process of the flow field structure and can be used for analyzing and calculating the time evolution characteristic of the flow field structure. Alternatively, the tracer particles may be nanoparticles or larger scale particles for PIV velocimetry. Optionally, the multi-cavity laser 31 is a four-cavity laser, a six-cavity laser or an eight-cavity laser. Optionally, the filtering component 322 employs a narrow band filter or a narrow band filter. Alternatively, after one pulse period ends, the next pulse period may begin.
As shown in fig. 2, in this embodiment, the output end of the dual-cavity laser 311 is provided with a frequency doubling and beam combining component 312 for frequency doubling and beam combining the laser pulses output by the dual-cavity laser 311. The infrared light can be changed into visible light with shorter wavelength by carrying out frequency doubling on the laser pulse, so that the observation by human eyes is facilitated. By combining the multiple paths of laser pulses output by the multiple dual-cavity lasers 311, the multiple paths of laser pulses are spatially combined, and the same area in the flow field can be illuminated.
As shown in fig. 2, in the present embodiment, the frequency doubling and beam combining component 312 includes a frequency doubling crystal 3121 disposed at an output end of the dual-cavity laser 311 for frequency doubling the laser pulses output by the dual-cavity laser 311, and a beam combining light path 3122 disposed at an output end of the frequency doubling crystal 3121 for beam combining the laser pulses output by the frequency doubling crystal 3121. After the laser pulse output by the dual-cavity laser 311 is frequency-doubled by the frequency doubling crystal 3121, the multiple paths of laser pulses are combined by the light combining path 3122 to obtain a path of laser pulse.
As shown in fig. 2, in the present embodiment, the output end of the beam combining light path 3122 is provided with a sheet light assembly 313 for shaping the laser pulse output from the beam combining light path 3122. The laser pulse is shaped by the sheet light assembly 313 to obtain a sheet laser sheet light pulse, and the illumination range of the laser pulse can be enlarged.
As shown in fig. 3, in the present embodiment, the photographing device 32 further includes a light splitting component 323 disposed at an input end of the filter component 322 and configured to disperse light to the filter component 322, and a lens 324 disposed at an input end of the light splitting component 323 and configured to focus the light to the light splitting component 323. By focusing the light to the light splitting component 323 through the lens 324 and then dispersing the light to the light filtering component 322 through the light splitting component 323, it is possible to ensure that the plurality of cross-frame cameras 321 photograph the same area in the flow field.
As shown in fig. 3, in the present embodiment, the light splitting assembly 323 includes a light splitting pyramid 3231 disposed at an output end of the lens 324 and configured to split light into a plurality of beams of light, and a reflecting mirror 3232 disposed between the output end of the light splitting pyramid 3231 and an input end of the light filtering assembly 322 and configured to reflect the plurality of beams of light to the corresponding light filtering assembly 322. The beam splitting pyramid 3231 can split the light into multiple beams of light, which are then reflected by a mirror 3232 to the corresponding filtering components 322.
As shown in fig. 4, a preferred embodiment of the present invention further provides a test system for shooting a flow field structure in a wind tunnel test, including a wind tunnel test section 1 for forming a flow field through which an air flow flows, a trace particle input device communicated with an input end of the wind tunnel test section 1 and used for inputting trace particles into the wind tunnel test section 1, and a shooting system for shooting the flow field structure in the wind tunnel test section 1, where the shooting system adopts the above shooting system for shooting the flow field structure in the wind tunnel test. Airflow flows in the wind tunnel test section 1 to form a flow field, tracer particles are input into the wind tunnel test section 1 through the tracer particle input device, and then a flow field structure can be shot through the shooting system.
As shown in fig. 4, in the present embodiment, the trace particle input device includes a gas cylinder 21 for outputting gas, and a particle generator 22 respectively communicating with an output end of the gas cylinder 21 and an input end of the wind tunnel test section 1 and configured to generate trace particles and make the trace particles flow to the wind tunnel test section 1 along with the gas. The gas cylinder 21 can output high-pressure gas, the particle generator 22 can generate trace particles, and the trace particles are mixed with the gas in the particle generator 22 and flow into the wind tunnel test section 1 along with the gas.
As shown in fig. 4, in this embodiment, a window 11 is formed on the wind tunnel test section 1, a light guide arm 314 for extending to the window 11 and aligning with the window 11 to output laser pulses into the wind tunnel test section 1 is disposed on the multi-cavity laser 31 of the shooting system, and a lens 324 of a shooting device 32 of the shooting system aligns with the window 11. The light guide arm 314 of the multi-cavity laser 31 extends to the window 11 and is aligned with the window 11, so that laser pulses can be output into the wind tunnel test section 1 to illuminate the flow field, and the lens 324 of the photographing device 32 is aligned with the window 11 to photograph the illuminated area in the flow field.
As shown in fig. 4, in this embodiment, the testing system further includes a computer 4 connected to the photographing device 32 and the synchronization controller 33 of the photographing system, respectively, for capturing images photographed by the photographing device 32 and controlling the synchronization controller 33 to operate. The computer 4 can acquire the image shot by the shooting device 32, and then analyze and calculate the image, so as to obtain the time evolution characteristic of the flow field structure. The computer 4 may also control the synchronization controller 33 to issue control signals.
As shown in fig. 5, t represents a time delay, a represents a timing when the synchronous controller 33 sends out a control signal, b represents a timing when the dual cavity laser 311 outputs a laser pulse, and c represents a timing when the frame-crossing camera 321 exposes and images. The double-cavity laser 311 and the frame-crossing camera 321 correspondingly output laser pulses and perform exposure imaging one by one, and the phenomenon of overexposure of the second frame image of the frame-crossing camera 321 does not occur.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A shooting system for shooting a flow field structure in a wind tunnel test is characterized in that,
comprises a multi-cavity laser (31) and a shooting device (32), wherein the multi-cavity laser is used for outputting laser pulses into a wind tunnel test section (1) to illuminate a flow field in the wind tunnel test section (1) and enabling trace particles in the flow field to emit scattered light, the shooting device is used for utilizing the scattered light to expose and image so as to shoot a flow field structure,
the multi-cavity laser (31) comprises a plurality of parallel double-cavity lasers (311), the double-cavity lasers (311) output laser pulses with different wavelengths respectively, the shooting device (32) comprises a plurality of parallel frame-crossing cameras (321), the frame-crossing cameras (321) and the double-cavity lasers (311) are arranged in a one-to-one correspondence mode, the input end of each frame-crossing camera (321) is provided with a light filtering component (322) used for passing light with specific wavelength, the wavelength of the light which can pass through the light filtering component (322) is the same as the wavelength of the laser pulses output by the corresponding double-cavity lasers (311),
the shooting system further comprises a synchronous controller (33) which is respectively connected with the plurality of double-cavity lasers (311) and the plurality of frame-crossing cameras (321) and is used for respectively controlling the pulse timing of the double-cavity lasers (311) and the exposure timing of the frame-crossing cameras (321);
the shooting device (32) further comprises a light splitting component (323) which is arranged at the input end of the light filtering component (322) and used for dispersing light to the light filtering component (322), and a lens (324) which is arranged at the input end of the light splitting component (323) and used for focusing the light to the light splitting component (323);
the light splitting assembly (323) includes a light splitting pyramid (3231) disposed at an output end of the lens (324) and configured to split light into a plurality of beams of light, and a reflecting mirror (3232) disposed between an output end of the light splitting pyramid (3231) and an input end of the filtering assembly (322) and configured to reflect the plurality of beams of light to the corresponding filtering assembly (322).
2. The shooting system for shooting the flow field structure in the wind tunnel test according to claim 1,
and the output end of the double-cavity laser (311) is provided with a frequency doubling and beam combining component (312) for frequency doubling and beam combining of laser pulses output by the double-cavity laser (311).
3. The shooting system for shooting the flow field structure in the wind tunnel test according to claim 2,
the frequency doubling and beam combining component (312) comprises a frequency doubling crystal (3121) arranged at the output end of the double-cavity laser (311) and used for frequency doubling of the laser pulses output by the double-cavity laser (311), and a beam combining light path (3122) arranged at the output end of the frequency doubling crystal (3121) and used for beam combining of the laser pulses output by the frequency doubling crystal (3121).
4. The shooting system for shooting the flow field structure in the wind tunnel test according to claim 3,
and the output end of the beam combining light path (3122) is provided with a sheet light assembly (313) for shaping the laser pulse output by the beam combining light path (3122).
5. A test system for shooting a flow field structure in a wind tunnel test is characterized in that,
comprises a wind tunnel test section (1) for forming a flow field by the flowing of air flow, a tracer particle input device which is communicated with the input end of the wind tunnel test section (1) and is used for inputting tracer particles into the wind tunnel test section (1), and a shooting system for shooting the flow field structure in the wind tunnel test section (1),
the shooting system for shooting the flow field structure in the wind tunnel test is adopted according to any one of claims 1 to 4.
6. The testing system for shooting the flow field structure in the wind tunnel test according to claim 5,
the tracer particle input device comprises a gas cylinder (21) used for outputting gas and a particle generator (22) which is respectively communicated with the output end of the gas cylinder (21) and the input end of the wind tunnel test section (1) and used for generating tracer particles and enabling the tracer particles to flow into the wind tunnel test section (1) along with the gas.
7. The testing system for shooting the flow field structure in the wind tunnel test according to claim 5,
the wind tunnel test section (1) is provided with a window (11), a multi-cavity laser (31) of the shooting system is provided with a light guide arm (314) which is used for extending to the window (11) and aligning the window (11) to output laser pulses into the wind tunnel test section (1), and a lens (324) of a shooting device (32) of the shooting system aligns to the window (11).
8. The testing system for shooting the flow field structure in the wind tunnel test according to claim 5,
the testing system also comprises a computer (4) which is respectively connected with a shooting device (32) and a synchronous controller (33) of the shooting system and is used for collecting images shot by the shooting device (32) and controlling the synchronous controller (33) to work.
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| CN112489134B (en) * | 2020-11-26 | 2024-05-14 | 南方科技大学 | Motion estimation-oriented frame-crossing ultra-high-speed camera design method and motion estimation method |
| CN113960043B (en) * | 2021-10-20 | 2024-05-28 | 中国人民解放军国防科技大学 | Determination method and device for supersonic/hypersonic turbulence time evolution characteristics |
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