CN103336144A - Method for testing water surface fine-speed flow field - Google Patents
Method for testing water surface fine-speed flow field Download PDFInfo
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- CN103336144A CN103336144A CN2013102058905A CN201310205890A CN103336144A CN 103336144 A CN103336144 A CN 103336144A CN 2013102058905 A CN2013102058905 A CN 2013102058905A CN 201310205890 A CN201310205890 A CN 201310205890A CN 103336144 A CN103336144 A CN 103336144A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 55
- 238000010219 correlation analysis Methods 0.000 claims description 9
- 238000010998 test method Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 230000005587 bubbling Effects 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 150000002367 halogens Chemical class 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000000700 radioactive tracer Substances 0.000 abstract 3
- 238000005516 engineering process Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000000917 particle-image velocimetry Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 235000011609 Pinus massoniana Nutrition 0.000 description 1
- 241000018650 Pinus massoniana Species 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Abstract
The invention relates to a method for testing a water surface fine-speed flow field. A light source is used for illuminating tracer particles, and with the cooperation of a CCD aperture, a V-shaped convergence and divergence flow field formed by tracer particles transmitted to the water surface by internal waves excited by a dragging model is photographed. The measurement of flow field speed is realized by following the speed of the tracer particles which move together with the flow field by using the above principle. The method is simple and effective, is high in application flexibility, and realizes non-contact and non-interference 'surface type' measurement of an mm/s order water surface flow field.
Description
Technical field
The present invention relates to a kind of water surface flow field velocity method of testing, relate in particular to a kind of being applied in the fluid mechanics laboratory, based on the method for testing in the water surface dead slow speed flow field of optical particle image cross-correlation analysis method.
Background technology
The measuring technique in water surface flow field is a crucial measuring technology of carrying out aircraft tail research in the water, at present, conventional flow-field test instrument has the LDV(Laser Doppler Velocimeter), ADV(acoustic Doppler knotmeter), PIV(particle image velocimetry method), hotting mask instrument, Pitot tube etc., but these measuring technologies all can only be used for the measurement in water flow field, and for the water surface flow field that the free face is located, do not have effective measurement means at present as yet.
Summary of the invention
The applicant has carried out testing research at above-mentioned existing issue, and the method for testing in a kind of simple and effective water surface dead slow speed flow field is provided, and it is low to have a testing cost, the advantage of good test effect.
The technical solution adopted in the present invention is as follows:
The method of testing in a kind of water surface dead slow speed flow field is characterized in that may further comprise the steps:
The first step: the shooting instrument is arranged in the top in the stratified flow experimental tank, is used for trace particle motion loss diagram picture on the filming surface, and the distance between adjustment shooting instrument and the experimental tank water surface is to obtain to satisfy the shooting area size of testing requirement;
Second step: uniform described trace particle on the water surface of stratified flow experimental tank;
The 3rd step: be positioned at described stratified flow experimental tank both sides and arrange lighting source, extend under lighting source is oblique and illuminate the water surface and trace particle;
The 4th step: in the underwater towing test model of described experimental tank, utilize the shooting instrument in chronological sequence to take to draw by the towing trial model under water disturbance be passed to that the water surface forms the flow field several be in the water surface particle pictures in the different moment.
The 5th step: the water surface particle picture that adopts the cross-correlation analysis method that above-mentioned the 4th step is drawn is handled, and draws the averaged particles shift value in the particle image movement vector
, and the shooting time by the particle image movement vector is at interval
, draw the velocity that described trace particle displacement obtains
, computing formula is:
Its further technical scheme is
Described trace particle adopts pollen or the hollow glass ball of bubbling through the water column;
The particle diameter of described trace particle is tens of um magnitudes;
Described lighting source is Halogen lamp LED or electricity-saving lamp;
The layout scope of described trace particle is directly proportional with the shooting area that the shooting instrument is arranged.
Beneficial effect of the present invention is as follows:
The inventive method is simply effective, the application flexibility height, utilize light source to illuminate trace particle, cooperate with the CCD aperture, excite interior ripple to be passed to the diffusing flow field of the poly-width of cloth of " V " font width of cloth that the water surface forms thereby take to draw by pulling model, the speed of utilizing above-mentioned principle to follow the trace particle of flow field motion realizes the flow field velocity measurement, and passes through cross-correlation analysis, realize the noncontact in mm/s magnitude water surface flow field, glitch-free " face formula " measured.
Description of drawings
Fig. 1 is the structural representation of embodiment of the present invention.
Fig. 2 is the water surface flow field vector of the present invention in first moment.
Fig. 3 is the water surface flow field vector of the present invention in second moment.
The water surface flow field polar plot of Fig. 4 for drawing by method of testing of the present invention.
Fig. 5 is by method of testing of the present invention and utilizes software to draw the motion pattern in the water surface flow field that draws.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
The method of testing in a kind of water surface dead slow speed flow field is characterized in that may further comprise the steps:
The first step: as shown in Figure 1, above stratified flow experimental tank 3, arrange shooting instrument 1, shooting instrument 1 is the CCD camera, the motion loss diagram picture that is used for the filming surface trace particle, the resolution of CCD camera is 1600pixels * 1200pixels, focal length is 24mm, filming frequency 1hz～34hz, distance between CCD camera and the stratified flow experimental tank water surface is 3m, adjustment CCD camera makes shooting area cover stratified flow experimental tank pool wall on one side to whole towing model apart from the height of the water surface, and coverage is 1057mm * 792mm.
Second step: on the water surface of stratified flow experimental tank 3, evenly spray trace particle 5, trace particle 5 adopts not broken masson pine pollen, the layout scope of trace particle 5 is directly proportional with the coverage of shooting instrument 1, the particle diameter of trace particle 5 is tens of um magnitudes, every square metre is sprayed 20g～30 g, make the phenomenon of the cheap pilot region of trace particle in the process of the test as if the reason that flows owing to the water surface, need in time to replenish trace particle.
The 3rd step: lighting source 2 is arranged in the both sides, front and back that are positioned at stratified flow experimental tank 3, and lighting source 2 is Halogen lamp LED or electricity-saving lamp, extends under lighting source 2 is oblique and illuminates the water surface and trace particle.Adjust the aperture of CCD camera, make the brightness of image in the camera moderate, can differentiate the profile of trace particle 5, under the situation that the transition exposure do not occur, adjust the CCD camera focus, focus on water surface particle.
The 4th step: drag stratified flow experimental tank 3 test model 4 under water, as shown in Figure 1, test model 4 is with arrow direction, ripple reaches the flow field that the water surface forms the poly-divergence of " V " font spoke (the flow field cycle of the ripple water surface is in the magnitude of second in the present embodiment in exciting under water simultaneously, specifically refer to the cycle that the flow field changes, cycle short explanation flow field variation is fast, need the filming frequency of camera also higher, vice versa) thus the trace particle 5 on the water surface is moved, start the particle image movement vector that the collection of CCD camera is in chronological sequence arranged simultaneously.
The 5th step:
Adopt the cross-correlation analysis method that the particle image movement vector in above-mentioned the 4th step is handled, draw as Fig. 2, two width of cloth shown in Figure 3 have seasonal effect in time series water surface flow field vector image, and (this time point refers to the order of shooting time, this water surface flow field vector is the particle motion vector), the concrete grammar of above-mentioned cross-correlation analysis method is that the image with above-mentioned water surface flow field vector is divided into a series of districts of interrogating, interrogating the district is that original image is divided into a series of little rectangular areas, corresponding pixel such as 30pixels * 30pixels etc., interrogate the gradation of image function of zone position according to first two field picture, second two field picture is interrogated zone position and is interrogated correlativity between the gradation of image function value of zone position side-play amount with respect to first two field picture, draws this and interrogates averaged particles shift value in the district
, each is looked into one and asks that Qu Douke tries to achieve displacement vector
, as shown in Figure 4, the direction of arrow has represented the flow direction of fluid particle among the figure, and length has represented the flowing velocity size, and passes through the shooting time interval of particle image movement vector
, draw the velocity that described trace particle displacement obtains
, computing formula is:
Interrogate the method that the district repeats above-mentioned the 5th step with all, and obtain each by the cross-correlation analysis method and interrogate averaged particles shift value in the district
, for the particle image movement vector cross-correlation analysis can adopt commercial PIV software (as TSI INSTGHT, Lavision DaVis etc.), adopt TSI INSTGHT among the present invention.Can also draw out motion pattern by Tecplot software for the velocity that above-mentioned trace particle displacement obtains, as shown in Figure 5, the line among the figure has represented the mobile trace of fluid particle).
The concrete calculating of above-mentioned cross-correlation analysis and analytical approach are existing known technology.
More than describing is explanation of the invention, is not that institute of the present invention restricted portion is referring to claim to the restriction of invention, and under the situation of basic structure of the present invention, the present invention can do any type of modification.
Claims (5)
1. the method for testing in a water surface dead slow speed flow field is characterized in that may further comprise the steps:
The first step: shooting instrument (1) is arranged in the top in the stratified flow experimental tank, be used for trace particle (5) motion loss diagram picture on the filming surface, the distance between adjustment shooting instrument (1) and experimental tank (3) water surface is to obtain to satisfy the shooting area size of testing requirement;
Second step: uniform described trace particle (5) on the water surface of stratified flow experimental tank (3);
The 3rd step: be positioned at described stratified flow experimental tank (3) both sides and arrange lighting source (2), extend under lighting source (2) is oblique and illuminate the water surface and trace particle;
The 4th step: in the underwater towing test model (4) of described experimental tank, utilize shooting instrument (1) in chronological sequence to take to draw by towing trial model (4) under water disturbance be passed to that the water surface forms the flow field several be in the difference water surface particle pictures in the moment.
2. the 5th go on foot: the water surface particle picture that adopts the cross-correlation analysis method that above-mentioned the 4th step is drawn is handled, and draws the averaged particles shift value in the particle image movement vector
, and the shooting time by the particle image movement vector is at interval
, draw the velocity that described trace particle displacement obtains
, computing formula is:
The method of testing in a kind of water surface dead slow speed as claimed in claim 1 flow field is characterized in that: described trace particle (5) adopts pollen or the hollow glass ball of bubbling through the water column.
3. the method for testing in a kind of water surface dead slow speed as claimed in claim 1 flow field, it is characterized in that: the particle diameter of described trace particle (5) is tens of um magnitudes.
4. the method for testing in a kind of water surface dead slow speed as claimed in claim 1 flow field, it is characterized in that: described lighting source (2) is Halogen lamp LED or electricity-saving lamp.
5. the method for testing in a kind of water surface dead slow speed as claimed in claim 1 flow field, it is characterized in that: the layout scope of described trace particle (5) is directly proportional with the shooting area that shooting instrument (1) is arranged.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103578118A (en) * | 2013-10-24 | 2014-02-12 | 河海大学 | Time-average flow field reconstruction method based on sequential image vector averaging |
| CN103698553A (en) * | 2013-12-26 | 2014-04-02 | 天津大学 | Novel surface flow field velocity measurement system and velocity measurement method on basis of infrared image pickup |
| CN106908218A (en) * | 2017-03-23 | 2017-06-30 | 北京尚水信息技术股份有限公司 | The processing method of river course surface flow field |
| CN107631857A (en) * | 2017-07-21 | 2018-01-26 | 哈尔滨工程大学 | The measuring system in fine flow field between a kind of trimaran main leaf body |
| CN108279086A (en) * | 2018-01-12 | 2018-07-13 | 三峡大学 | A kind of fish body pressure field measurement apparatus and method based on PIV |
| CN108801584A (en) * | 2017-10-17 | 2018-11-13 | 沈熊 | Wave current flow velocity measuring system, water hole formula swimming machine system based on Laser Doppler speed and velocity correction method |
| CN108830170A (en) * | 2018-05-24 | 2018-11-16 | 杭州电子科技大学 | A kind of end-to-end method for tracking target indicated based on layered characteristic |
| CN111220588A (en) * | 2020-03-24 | 2020-06-02 | 哈尔滨工业大学（威海） | Flow field radiation convergence and dispersion measurement method based on oil film fluorescence brightness |
| CN112774851A (en) * | 2020-12-23 | 2021-05-11 | 中煤科工集团唐山研究院有限公司 | Shallow slot separator experiment table and experiment method |
| CN113109020A (en) * | 2021-03-18 | 2021-07-13 | 上海交通大学 | Tracing method and system |
| CN114994355A (en) * | 2022-06-08 | 2022-09-02 | 中南大学 | Gas-liquid two-phase flow field measuring method and system based on non-laser light source |
| CN115932321A (en) * | 2022-12-22 | 2023-04-07 | 武汉大学 | Microscopic erosion visualization device and method based on particle image velocimetry |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103578118B (en) * | 2013-10-24 | 2016-02-24 | 河海大学 | Based on the time-mean flow field method for reconstructing that sequential image vector is average |
| CN103578118A (en) * | 2013-10-24 | 2014-02-12 | 河海大学 | Time-average flow field reconstruction method based on sequential image vector averaging |
| CN103698553A (en) * | 2013-12-26 | 2014-04-02 | 天津大学 | Novel surface flow field velocity measurement system and velocity measurement method on basis of infrared image pickup |
| CN106908218B (en) * | 2017-03-23 | 2018-11-30 | 北京尚水信息技术股份有限公司 | The processing method of river surface flow field |
| CN106908218A (en) * | 2017-03-23 | 2017-06-30 | 北京尚水信息技术股份有限公司 | The processing method of river course surface flow field |
| CN107631857A (en) * | 2017-07-21 | 2018-01-26 | 哈尔滨工程大学 | The measuring system in fine flow field between a kind of trimaran main leaf body |
| CN107631857B (en) * | 2017-07-21 | 2020-04-07 | 哈尔滨工程大学 | System for measuring fine flow field between main body pieces of trimaran |
| CN108801584A (en) * | 2017-10-17 | 2018-11-13 | 沈熊 | Wave current flow velocity measuring system, water hole formula swimming machine system based on Laser Doppler speed and velocity correction method |
| CN108801584B (en) * | 2017-10-17 | 2024-04-02 | 沈熊 | Wave flow velocity measurement system based on laser Doppler velocity measurement, water tunnel type swimming machine system and velocity correction method |
| CN108279086A (en) * | 2018-01-12 | 2018-07-13 | 三峡大学 | A kind of fish body pressure field measurement apparatus and method based on PIV |
| CN108830170A (en) * | 2018-05-24 | 2018-11-16 | 杭州电子科技大学 | A kind of end-to-end method for tracking target indicated based on layered characteristic |
| CN108830170B (en) * | 2018-05-24 | 2022-03-18 | 杭州电子科技大学 | End-to-end target tracking method based on layered feature representation |
| CN111220588A (en) * | 2020-03-24 | 2020-06-02 | 哈尔滨工业大学（威海） | Flow field radiation convergence and dispersion measurement method based on oil film fluorescence brightness |
| CN112774851A (en) * | 2020-12-23 | 2021-05-11 | 中煤科工集团唐山研究院有限公司 | Shallow slot separator experiment table and experiment method |
| CN113109020A (en) * | 2021-03-18 | 2021-07-13 | 上海交通大学 | Tracing method and system |
| CN114994355A (en) * | 2022-06-08 | 2022-09-02 | 中南大学 | Gas-liquid two-phase flow field measuring method and system based on non-laser light source |
| CN115932321A (en) * | 2022-12-22 | 2023-04-07 | 武汉大学 | Microscopic erosion visualization device and method based on particle image velocimetry |
| CN115932321B (en) * | 2022-12-22 | 2023-10-10 | 武汉大学 | Microcosmic corrosion visualization device and method based on particle image velocimetry |
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