CN102435407A - Shooting system and method for shooting high-speed turbulence flowing image in wind tunnel test - Google Patents
Shooting system and method for shooting high-speed turbulence flowing image in wind tunnel test Download PDFInfo
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- CN102435407A CN102435407A CN201110260678XA CN201110260678A CN102435407A CN 102435407 A CN102435407 A CN 102435407A CN 201110260678X A CN201110260678X A CN 201110260678XA CN 201110260678 A CN201110260678 A CN 201110260678A CN 102435407 A CN102435407 A CN 102435407A
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Abstract
The invention provides a shooting system and method for shooting a high-speed turbulence flowing image in a wind tunnel test. The shooting system comprises a synchronous controller, a computer system controlling the synchronous controller, a nano particle generator, a multi-cavity pulse laser connected with the synchronous controller and an ultrahigh-speed camera connected with the synchronous controller, wherein the nano particle generator throws nano tracing particles into a wind tunnel; each laser cavity of the multi-cavity pulse laser emits a laser beam lighting the flow field of the wind tunnel in turn according to a first predetermined pulse time sequence; the ultrahigh-speed camera shoots the turbulence of the wind tunnel according to a second predetermined pulse time sequence; the second and first predetermined pulse time sequences have the same frequency; and every adjacent two pulse time sequences of the first and second predetermined pulse time sequences are at an interval of 0.2-10 microseconds. In the invention, by adopting the multi-cavity pulse laser, the time interval between every adjacent two laser beams is reduced, and small enough time interval between adjacent two turbulence images is guaranteed.
Description
Technical field
The present invention relates to aviation field, especially, relate to a kind of camera system that wind tunnel experiment is taken the high velocity turbulent flow flow image that is used for.In addition, the invention still further relates to a kind of method that comprises above-mentioned camera system.
Background technology
Along with the development of high-speed aircraft, engineering technology problems such as aircraft aeroperformance, surface heat protection and FLOW CONTROL are badly in need of the high velocity turbulent flow fluidal texture is furtherd investigate.
High velocity turbulent flow flows, and not only movement velocity is fast, and its non-stationarity that flows can cause fluidal texture to change fast in time.In addition, swiftly flowing compressible effect, three-dismensional effect also make fluidal texture very complicated.These have all proposed very high requirement to the display technique that flows.To above problem, and article " based on the mobile imaging of the supersonic speed of nano particle " (Zhao Yuxin etc., Chinese science E collects; Technological sciences; 2009,39 (12): 1911-1918) proposed the spike of a kind of employing nano particle, be used for the method (abbreviating the NPLS technology as) that the high velocity turbulent flow fluidal texture is measured.This technology not only can be used for the measurement to three-dimensional flow field, has the hi-vision signal to noise ratio (S/N ratio) simultaneously, and characteristics such as hi-vision time and space resolution can satisfy the measurement to the high velocity turbulent flow fluidal texture.
It is fast to have movement velocity owing to high velocity turbulent flow is mobile, obtain the flow image that the seriation time changes, and this just requires the time interval enough little (being generally the microsecond magnitude) between per two width of cloth images.Yet existing NPLS technology receives the restriction of hardware device performances such as laser instrument, CCD camera, can only obtain the flow image of two time points, and can't obtain in a series of time periods, high velocity turbulent flow fluidal texture image that the time interval is enough little.
Summary of the invention
Camera system with very high-resolution high velocity turbulent flow flow image and method that the object of the invention is to provide a kind of can take in a series of time periods, the time interval reaches the microsecond magnitude; Can only obtain the flow image of two time points to solve, and can't obtain in a series of time periods, the technical matters of high velocity turbulent flow fluidal texture image that the time interval is enough little.
For realizing above-mentioned purpose; According to an aspect of the present invention; A kind of camera system that wind tunnel experiment is taken the high velocity turbulent flow flow image that is used for is provided; High velocity turbulent flow in the wind tunnel experiment cabin is carried out flow image take, comprise isochronous controller, connect isochronous controller and control computer system and the nano particle generator that isochronous controller sends control signal; The nano particle generator is used for throwing in to wind-tunnel the trace particle of nanometer scale; Be connected in the multi-cavity pulsed laser of isochronous controller, the multi-cavity pulsed laser comprises several laser cavitys, and each laser cavity is launched the laser beam that illuminates wind tunnel experiment cabin flow field successively according to the first predetermined pulse sequential; And the hypervelocity camera of connection isochronous controller; The hypervelocity camera is the turbulent flow shooting in the ordered pair wind tunnel experiment cabin during according to second predetermined pulse; The second predetermined pulse sequential is identical with the first predetermined pulse time sequence frequency, and is spaced apart 0.2 to 10 microsecond between every adjacent two pulse sequences of first and second predetermined pulse sequential.
Further, the wind tunnel experiment cabin comprises optical window; The transmitting terminal of multi-cavity pulsed laser is provided with a smooth arm, and multi-cavity pulsed laser emitted laser bundle is derived via the light arm and formed the projection light face, and the projection light face illuminates the flow field in the wind tunnel experiment cabin through optical window.
Further, optical window is arranged on each sidewall in wind tunnel experiment cabin.
Further, the camera lens of hypervelocity camera is taken the flow field structure in the wind tunnel experiment cabin through the optical window of wind tunnel experiment cabin sidewall.
Further; The light arm is extended to over against optical window by the multi-cavity pulsed laser; The exit of light arm is equipped with sheet optical lens group, and so that multi-cavity pulsed laser emitted laser bundle is deformed into planar light source, planar light source illuminates the flow field in the wind tunnel experiment cabin through optical window.
Further, isochronous controller generates the synchronizing pulse sequential; The first predetermined pulse sequential confirms based on the synchronizing pulse sequential, and synchronizing pulse sequential first delay time of delaying time relatively; The second predetermined pulse sequential confirms based on the synchronizing pulse sequential, and synchronizing pulse sequential second delay time of delaying time relatively; Second delay time is less than first delay time, and the time of origin of arbitrary pulse of the first predetermined pulse sequential is positioned at the time of origin of the corresponding pulses of the second predetermined pulse sequential.
Further, the delay time of hypervelocity camera is adjustable.
According to a further aspect in the invention; A kind of image pickup method that wind tunnel experiment is taken the high velocity turbulent flow flow image that is used for also is provided, and it comprises the steps: to open the nano particle generator makes the nano particle generator evenly in the wind-tunnel Laboratory Module, throw in the nanometer trace particle continuously; Send control signal through computer system indication isochronous controller; After the multi-cavity pulsed laser receives that isochronous controller sends control signal; A plurality of laser cavitys of indication multi-cavity pulsed laser are according to first predetermined pulse sequential emission of lasering beam successively; Simultaneously; The hypervelocity camera receives after isochronous controller sends control signal and takes exposure successively continuously according to the second predetermined pulse sequential that the second predetermined pulse sequential is identical with the first predetermined pulse time sequence frequency; The turbulent flows image that computer system stores hypervelocity camera is taken successively continuously, and be spaced apart 0.2 to 10 microsecond between every adjacent two pulse sequences of first and second predetermined pulse sequential.
Further, be stored in the buffer memory of hypervelocity camera behind the corresponding turbulent flows image of taking of hypervelocity camera shooting exposure earlier; Transferring to computer system afterwards again preserves.
Further, computer system indicates isochronous controller to send control signal after accomplishing turbulent flows image store operational once more; And computer system indicates isochronous controller to send the minimum value in the time interval that control signal and isochronous controller sent control signal last time greater than time shutter of hypervelocity camera once more.
The present invention has following beneficial effect: the present invention utilizes the multi-cavity pulsed laser, has reduced the interval time between every adjacent twice laser beam, has guaranteed that the time interval between adjacent twice turbulent flow image is enough little.Utilize the hypervelocity camera to take and obtain a series of high-resolution turbulent flow image.
Except top described purpose, feature and advantage, the present invention also has other purpose, feature and advantage.To do further detailed explanation to the present invention with reference to figure below.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the synoptic diagram that wind tunnel experiment is taken the camera system of high velocity turbulent flow flow image that is used for of the preferred embodiment of the present invention;
Fig. 2 is that the use of the preferred embodiment of the present invention is used for the synoptic diagram of method that wind tunnel experiment is taken the camera system of high velocity turbulent flow flow image; And
Fig. 3 is that the wind tunnel experiment that is used for of the preferred embodiment of the present invention is taken the signal sequence synoptic diagram in the camera system of high velocity turbulent flow flow image.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Referring to Fig. 1, the camera system that the present invention is used for wind tunnel experiment shooting high velocity turbulent flow flow image is used for the high velocity turbulent flows in the wind tunnel experiment cabin 10 are carried out the flow image measurement.This camera system that is used for wind tunnel experiment shooting high velocity turbulent flow flow image comprises nano particle generator 20, multi-cavity pulsed laser 30, isochronous controller 40, hypervelocity camera 50 and computer system 60.
Each sidewall in wind tunnel experiment cabin 10 comprises an optical window 12, each sidewall of same section that is formed at wind tunnel experiment cabin 10 of these optical windows 12.Hypervelocity camera 50 sees through optical window 12 so that the turbulent flow in the wind tunnel experiment cabin 10 is dynamically made a video recording.
The emission port of nano particle generator 20 is over against the entrance point in wind tunnel experiment cabin 10.The nano particle that nano particle generator 20 is thrown in gets into wind tunnel experiment cabin 10, so that the high velocity turbulent flow in the wind tunnel experiment cabin 10 is carried out spike.Adopt nano particle as the trace particle that flows, make the image of taking have very high signal noise ratio (snr) of image and spatial resolution, remedied the deficiency that existing similar camera system exists.
Multi-cavity pulsed laser 30 comprises several laser cavitys, and each laser cavity can the compartment of terrain emission of lasering beam.The transmitting terminal of this multi-cavity pulsed laser 30 is fixed with a smooth arm 32.This light arm 32 extends to the top of multi-cavity pulsed laser 30, and bending extends to the top of the optical window 12 in wind tunnel experiment cabin 10 again, is bent to form an outlet over against this optical window 12 to optical window 12 again.The exit of this light arm 32 is equipped with sheet optical lens group 34, so that multi-cavity pulsed laser 30 emitted laser bundles are deformed into planar light source.Planar light source sees through optical window 12 and illuminates the flow field in the wind tunnel experiment cabin 10.According to the principle of laser works, the individual pulse laser instrument can not be launched multiple laser in a short period of time.Therefore, the present invention adopts multi-cavity pulsed laser 30 can in a short period of time or even launch multiple laser in the microsecond magnitude.
The camera lens of hypervelocity camera 50 is through the optical window 12 on 10 sidewalls of wind tunnel experiment cabin, to carrying out the nano particle shooting of turbulent flow spike in the wind tunnel experiment cabin 10.Hypervelocity camera 50 also is connected in computer system 60, so that through computer system 60 storage hypervelocity cameras 50 each turbulent flows images of taking.Adopt the hypervelocity camera can realize the shooting of several high-definition pictures at short notice.
The camera system that is used for wind tunnel experiment shooting high velocity turbulent flow flow image of the present invention uses the quantity of the high velocity turbulent flow fluidal texture image in a series of time periods that can access by the quantity of the laser cavity of multi-cavity pulsed laser 30 and the performance parameter decision of hypervelocity camera 50 at every turn.The performance parameter of hypervelocity camera 50 comprises the work schedule that operational mode and the camera internal hardware of camera are set, that is: time shutter of camera and with time of image transfer to register or buffer memory.
Please combine with reference to Fig. 2, use the method that is used for the camera system of wind tunnel experiment shooting high velocity turbulent flow flow image of the present invention that following step is arranged:
S1: open nano particle generator 20, make nano particle generator 20 evenly in wind-tunnel Laboratory Module 10, throw in the nanometer trace particle continuously.
S2: send first control signal to isochronous controller 40 by computer system 60.
S3: please combine with reference to 3, each laser cavity was launched the laser beam that illuminates wind tunnel experiment cabin 10 flow fields successively according to the first predetermined pulse sequential after multi-cavity pulsed laser 30 was received first control signal; Hypervelocity camera 50 is the turbulent flows shooting in the ordered pair wind tunnel experiment cabin 10 during according to second predetermined pulse, and the second predetermined pulse sequential is identical with the first predetermined pulse time sequence frequency.Be spaced apart 0.2 to 10 microsecond between every adjacent two pulse sequences of first and second predetermined pulse sequential, the best is 2 microseconds.
Wherein: a representes the work schedule of the control wave that isochronous controller 40 sends; B representes the work schedule of the laser beam that multi-cavity pulsed laser 30 sends; C representes the work schedule of hypervelocity camera 50 exposures.B and c confirm based on the sequential a of isochronous controller 40.And b is with respect to a first delay time T1 that delays time; C is with respect to a second delay time T2 that delays time.
After multi-cavity pulsed laser 30 was received first control signal, through being given off laser beam by first laser cavity behind the first delay time T1, laser beam realized swashing combiner through the optical module of multi-cavity pulsed laser 30 and becomes the first bundle laser beam.The first bundle laser beam is through light arm 32, and forms planar light sources 342 via sheet optical lens group 34 backs in the exit of light arm 32, to illuminate wind tunnel experiment cabin 10.Behind the nanometer trace particle in the laser radiation wind tunnel experiment cabin 10 scattering takes place, scattered light signal is accepted by high speed camera 50 through optical window 12, to realize the shooting to turbulent flow.
Meanwhile, after hypervelocity camera 50 is received first control signal, through behind the second delay time T2 optical window 12 being taken exposure work, to form first turbulent flows image constantly.Hypervelocity camera 50 cuts out after accomplishing exposure, and above-mentioned first turbulent flows image constantly is saved to the buffer memory of hypervelocity camera 50.
In this step, the first delay time T1 promptly is laser time delay; The second delay time T2 promptly is the camera delay time.Laser T1 time delay that launches each bundle laser beam is generally by 30 decisions of this multi-cavity pulsed laser; So can just in time be in the time range of hypervelocity camera 50 corresponding exposures to guarantee each bundle laser beam that multi-cavity pulsed laser 30 sends through the camera delay time T2 of adjustment hypervelocity camera 50.
S4: first the turbulent flows image constantly in the buffer memory of hypervelocity camera 50 is transferred to computer system 60, and store the turbulent flows image of hypervelocity cameras 50 this time shootings by computer system 60.
S5: judge whether the turbulent flows image store operational among the completing steps S4 through computer system 60.Judge simultaneously with the moment that isochronous controller 40 sends first control signal and compare, whether passed through the time interval of Δ t.
When above-mentioned judged result be after, computer system 60 begins to send second control signal to isochronous controller 40, beginning circulation step S3 to S5 is to all having launched laser beam to all laser cavitys of multi-cavity pulsed laser 30.
It should be noted that: the time interval that isochronous controller 40 sends between the two adjacent control signals is Δ t, is the time interval between every adjacent two turbulent flow images in a series of time periods.Δ t can regulate through isochronous controller 40.For avoiding next laser beam constantly on hypervelocity camera 50, once to form images in the exposure process, the minimum value of Δ t must be greater than the time shutter of hypervelocity camera 50, and when guaranteeing down that beam of laser is sent, hypervelocity camera 50 last exposures are finished.
The present invention utilizes multi-cavity pulsed laser 30, has reduced the interval time between every adjacent twice laser beam, thereby has reduced Δ t effectively, has guaranteed that the time interval between adjacent twice turbulent flow image is enough little.Can take and obtain a series of high-resolution turbulent flow image.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind is used for the camera system that wind tunnel experiment is taken the high velocity turbulent flow flow image, the high velocity turbulent flow in the wind tunnel experiment cabin is carried out flow image take, and it comprises:
Isochronous controller, the said isochronous controller of connection are also controlled computer system and the nano particle generator that said isochronous controller sends control signal;
Said nano particle generator is used for throwing in to said wind-tunnel the trace particle of nanometer scale;
It is characterized in that the said camera system that is used for wind tunnel experiment shooting high velocity turbulent flow flow image also comprises:
Be connected in the multi-cavity pulsed laser of said isochronous controller, said multi-cavity pulsed laser comprises several laser cavitys, and each said laser cavity is launched the laser beam that illuminates said wind tunnel experiment cabin flow field successively according to the first predetermined pulse sequential; And
The hypervelocity camera that connects said isochronous controller; Said hypervelocity camera is the turbulent flow shooting in the said wind tunnel experiment of the ordered pair cabin during according to second predetermined pulse; The said second predetermined pulse sequential is identical with the said first predetermined pulse time sequence frequency, and is spaced apart 0.2 to 10 microsecond between every adjacent two pulse sequences of said first and second predetermined pulse sequential.
2. the camera system that is used for wind tunnel experiment shooting high velocity turbulent flow flow image according to claim 1 is characterized in that,
Said wind tunnel experiment cabin comprises optical window;
The transmitting terminal of said multi-cavity pulsed laser is provided with a smooth arm,
Said multi-cavity pulsed laser emitted laser bundle is derived via said smooth arm and is formed the projection light face, and said projection light face illuminates the flow field in the said wind tunnel experiment cabin through said optical window.
3. the camera system that is used for wind tunnel experiment shooting high velocity turbulent flow flow image according to claim 2 is characterized in that,
Said optical window is arranged on each sidewall in said wind tunnel experiment cabin.
4. the camera system that is used for wind tunnel experiment shooting high velocity turbulent flow flow image according to claim 3 is characterized in that,
The camera lens of said hypervelocity camera is taken the flow field structure in the said wind tunnel experiment cabin through the optical window of said wind tunnel experiment cabin sidewall.
5. the camera system that is used for wind tunnel experiment shooting high velocity turbulent flow flow image according to claim 4 is characterized in that,
Said smooth arm is extended to over against said optical window by said multi-cavity pulsed laser,
The exit of said smooth arm is equipped with sheet optical lens group,
Said optical lens group is deformed into planar light source with said multi-cavity pulsed laser emitted laser bundle, and said planar light source illuminates the flow field in the said wind tunnel experiment cabin through said optical window.
6. according to each described camera system that is used for wind tunnel experiment shooting high velocity turbulent flow flow image among the claim 1-5, it is characterized in that,
Said isochronous controller generates the synchronizing pulse sequential;
The said first predetermined pulse sequential confirms based on said synchronizing pulse sequential, and said relatively synchronizing pulse sequential first delay time of delaying time;
The said second predetermined pulse sequential confirms based on said synchronizing pulse sequential, and said relatively synchronizing pulse sequential second delay time of delaying time;
Said second delay time is less than said first delay time, and the time of origin of arbitrary pulse of the said first predetermined pulse sequential is positioned at the time of origin of the corresponding pulses of the said second predetermined pulse sequential.
7. according to each described camera system that is used for wind tunnel experiment shooting high velocity turbulent flow flow image among the claim 1-5, it is characterized in that,
The delay time of said hypervelocity camera is adjustable.
8. one kind is used for the image pickup method that wind tunnel experiment is taken the high velocity turbulent flow flow image, it is characterized in that, comprises the steps:
Opening the nano particle generator makes said nano particle generator evenly in the wind-tunnel Laboratory Module, throw in the nanometer trace particle continuously;
Send control signal through computer system indication isochronous controller;
After the multi-cavity pulsed laser receives that said isochronous controller sends control signal; A plurality of laser cavitys of indicating said multi-cavity pulsed laser are according to first predetermined pulse sequential emission of lasering beam successively; Simultaneously; The hypervelocity camera is received after said isochronous controller sends control signal and is taken exposure successively continuously according to the second predetermined pulse sequential; The said second predetermined pulse sequential is identical with the said first predetermined pulse time sequence frequency, and is spaced apart 0.2 to 10 microsecond between every adjacent two pulse sequences of said first and second predetermined pulse sequential;
The turbulent flows image that the said hypervelocity camera of said computer system stores is taken successively continuously.
9. high velocity turbulent flow flow image measuring method according to claim 8 is characterized in that,
Be stored in the buffer memory of said hypervelocity camera behind the said corresponding turbulent flows image of taking of said hypervelocity camera shooting exposure earlier;
Transferring to said computer system afterwards again preserves.
10. high velocity turbulent flow flow image measuring method according to claim 9 is characterized in that,
Said computer system indicates said isochronous controller to send control signal after accomplishing said turbulent flows image store operational once more;
And said computer system indicates said isochronous controller to send the minimum value in the time interval that control signal and said isochronous controller sent control signal last time greater than time shutter of said hypervelocity camera once more.
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| CN102853918A (en) * | 2012-08-24 | 2013-01-02 | 中国人民解放军国防科学技术大学 | Pneumatic optical wavefront ultra-high frequency measurement system and method |
| CN102853990A (en) * | 2012-10-08 | 2013-01-02 | 中国人民解放军国防科学技术大学 | Display system and display method for NPLS (nano-tracer planar laser scattering) three-dimensional structure of supersonic flow field |
| CN103149010A (en) * | 2013-02-22 | 2013-06-12 | 中国人民解放军国防科学技术大学 | NPLS measurement system and method for air inlet channel flow field based on high-supersonic-velocity pulse wind tunnel |
| CN104316289A (en) * | 2014-10-20 | 2015-01-28 | 中国航天空气动力技术研究院 | High-supersonic velocity wind tunnel dual-optical path system |
| CN104408703A (en) * | 2014-11-28 | 2015-03-11 | 中国航空工业空气动力研究院 | Wind tunnel dynamic test piece optical flow visualization system and image phase averaging method thereof |
| CN104458192A (en) * | 2014-11-28 | 2015-03-25 | 中国航空工业空气动力研究院 | Measurement system and measurement method for wind tunnel flow field vortex motion frequency |
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| 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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| CN115560990A (en) * | 2022-11-09 | 2023-01-03 | 中国人民解放军国防科技大学 | Supersonic gas-solid two-phase transverse jet flow experiment platform and jet flow measurement method |
| CN115560990B (en) * | 2022-11-09 | 2023-03-07 | 中国人民解放军国防科技大学 | Supersonic gas-solid two-phase transverse jet flow experiment platform and jet flow measurement method |
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