CN105301282A - Fluid three-dimensional velocity field measuring system - Google Patents
Fluid three-dimensional velocity field measuring system Download PDFInfo
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- CN105301282A CN105301282A CN201510825956.XA CN201510825956A CN105301282A CN 105301282 A CN105301282 A CN 105301282A CN 201510825956 A CN201510825956 A CN 201510825956A CN 105301282 A CN105301282 A CN 105301282A
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Abstract
The invention discloses a fluid three-dimensional velocity field measuring system comprising an experimental water tank, suspended noctilucent particles, a vertical CCD industrial camera, a horizontal CCD industrial camera, and a data processing computer. The suspended noctilucent particles satisfying a requirement are prepared according to the measuring range and the density of fluid to be measured and the prepared suspended noctilucent particles with different colors are uniformly mixed with the fluid to be measured. The vertical CCD industrial camera and the horizontal CCD industrial camera acquire the distribution map of the suspended noctilucent particles in the fluid to be measured. The data processing computer performs graphical noise reduction on the acquired distribution map of the suspended noctilucent particles and converts the distribution map of the suspended noctilucent particles into a digital matrix. The relative displacement of each noctilucent particle at consecutive time segments is computed by using an optimized matching method. Finally, the three-dimensional velocity field of the fluid to be measured at each time segment is acquired. The fluid three-dimensional velocity field measuring system may measure the three-dimensional displacement field of the fluid, and is simple, good in stability, high in measurement precision, and good in adaptability.
Description
Technical field
The present invention relates to a kind of fluid 3D velocity field measuring system, belong to Hydraulics and River Dynamics technical field.
Background technology
Model test method is widely used in the research of the content such as fluidised form and 3D velocity field of water body in Hydraulics and River Dynamics, wherein flow field survey technology is an important technology in model test method, therefore studies flow field survey technology significant for the development in hydraulics, river dynamics and correlation engineering field.
At present, existing multiple flow-speed measurement method.Current meter is a kind of widely used traditional flow velocity surveying instrument, easy for installation cheap, but this instrument can only measure the flow velocity of a measurement point but not the velocity flow profile in whole flow field, and the flow velocity of instrument to measured point itself has disturbance.Spatial filtering method, as parallel narrow slit grating and linear photoconductor detector also can realize the measurement of fluid flow rate, but such filter construction is difficult to ensure comparatively high measurement accuracy, and only can realize the fluid-velocity survey of the single measurement point of fluid.Particle-beam Tracing tachometric method (being called for short PTV) and particle image ve locity method (being called for short PIV) are the important method of the measurement fluid velocity of later application, but namely the measurement that these two kinds of methods are mainly used in fluid two dimensional surface speed measures the velocity field distribution of flow surface.
Summary of the invention
Object: in order to overcome the deficiencies in the prior art, the invention provides a kind of fluid 3D velocity field measuring system.The present invention can realize the measurement of the whole 3D velocity field of internal fluid, equipment simple and stable, processing efficient is analysed in diagram to fluorescent spot point numeral, measurement result lasting accuracy is high.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of fluid 3D velocity field measuring system, comprise: experimental trough, suspension noctilucence particle, vertical CCD industrial camera, horizontal CCD industrial camera, data handling machine, be provided with in described experimental trough and treat fluid measured, described in treat in fluid measured, to be evenly distributed with suspension noctilucence particle; Described vertical CCD industrial camera is arranged on directly over experimental trough, and described horizontal CCD industrial camera is arranged on experimental trough side, for taking the distribution plan in suspension noctilucence particle each moment in process fluid flow to be measured; Described data handling machine is connected with vertical CCD industrial camera, horizontal CCD industrial camera, and for the distribution plan of suspension noctilucence particle is converted to character matrix, and coupling obtains treating fluid measured 3D velocity field.
Described suspension noctilucence particle arranges water droplet structure.
The density of described suspension noctilucence particle is identical with treating the density of fluid measured.
Preferably, the color of described suspension noctilucence particle comprises multiple color.
Preferably, described experimental trough adopts transparent material.
Beneficial effect: a kind of fluid 3D velocity field measuring system provided by the invention, (1) suspension noctilucence particle due to the density of same Experimental Flowing Object identical, therefore can suspend at the diverse location of fluid, thus whole 3D velocity fields of fluid can be measured, but not the two-dimension speed field of flow surface; (2) suspension noctilucence particle can from main light emission within the time of one relatively long after absorbing luminous energy, therefore in the environment of dark, the very high picture of contrast can be obtained with the suspension noctilucence particle in industrial CCD camera shooting fluid, facilitate follow-up picture processing and displacement to resolve, also ensure that the accuracy of required velocity field simultaneously; (3) suspension noctilucence particle be drop shape, meet the condition of luminous intensity under volume little as far as possible and its density and experiment fluid-phase used with, therefore the flow field interference to Experimental Flowing Object of this kind of suspension noctilucence particle is little and its followability is good, can react the fluidised form treating fluid measured comparatively accurately; (4) the suspension noctilucence particle of multiple color has been selected to mix the 3D velocity field measuring fluid, the picture of the different time points therefore obtained by industrial CCD camera carry out whole audience suspension noctilucence particle comparison and can optimized algorithm when mating, improve counting yield, when shortening computing machine; (5) water pump, hydro-extractor or material that the isostructural model test of the hydraulic turbine adopts can not be full transparent material, and therefore the method for routine is difficult to the flow field measuring its inside.But in the method for the invention, suspension noctilucence particle can from main light emission, only need CCD camera can obtain suspended particle picture clearly through a less transparent position in structure; For large-scale river model test, because the velocity field of the measurement range large acquisition whole audience is more difficult, but described inventive method can be divided by simple measured zone, arranges several CCD camera more and can easily obtain whole audience velocity field.Therefore the method usable range is wide, strong adaptability.(6) few and simple, the stable equipment installation requirement also not having high request of equipment itself of the method equipment needed thereby quantity, therefore the method uses simple, and measuring accuracy is reliable and stable.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, a kind of fluid 3D velocity field measuring system, comprise: experimental trough 1, suspension noctilucence particle 2, vertical CCD industrial camera 3, horizontal CCD industrial camera 4, data handling machine 5, be provided with in described experimental trough 1 and treat fluid measured, described in treat in fluid measured, to be evenly distributed with suspension noctilucence particle 2; Described vertical CCD industrial camera 3 is arranged on directly over experimental trough 1, and described horizontal CCD industrial camera 4 is arranged on experimental trough 1 side, for taking the distribution plan in suspension noctilucence particle each moment in process fluid flow to be measured; Described data handling machine 5 is connected with vertical CCD industrial camera 3, horizontal CCD industrial camera 4, and for the distribution plan of suspension noctilucence particle is converted to character matrix, and coupling obtains treating fluid measured 3D velocity field.
Specific works step is as follows:
Step one: preparation suspension noctilucence particle.Described suspension noctilucence particle entirety is drop shape; The concrete volume of suspension noctilucence particle should meet CCD industrial camera take pictures sharpness condition under little as much as possible; Need to prepare multiple color suspension noctilucence particle and by its Homogeneous phase mixing; Density and the consistent in density treating fluid measured of suspension noctilucence particle, can treat each position geo-stationary of fluid measured.
Step 2: CCD industrial camera is installed.Described vertical CCD industrial camera is arranged on to be treated directly over fluid measured.Described horizontal CCD industrial camera to be arranged in surface level and can to obtain treats the clear pictures of fluid measured at vertical direction.Multiple CCD industrial camera can be arranged when fluid scope to be measured is larger.
Step 3: the collection of suspension noctilucence distribution of particles figure.Estimate the velocity magnitude treating fluid measured, select the frequency of taking pictures of suitable CCD industrial camera.After Preparatory work of experiment used is carried out, start experiment in dark conditions, and gather the distribution plan of the suspension noctilucence particle of different time points with all CCD industrial cameras, and the distribution plan of gathered suspension noctilucence particle is passed to described data handling machine simultaneously.
Step 4: 3D velocity field solves.The distribution plan of above-mentioned data handling machine PaintShop to the suspension noctilucence particle imported into carries out noise reduction process, improves its fluorescent spot point digitized map sharpness further.Then utilize digital imaging processing software, suspension noctilucence distribution of particles figure is converted to character matrix.
The character matrix that the suspension noctilucence distribution of particles figure different moment point gathered is corresponding mates.Owing to having the suspension noctilucence particle of different colours, can adopt when mating and reduce region of search, distinguish the method for different colours to improve the counting yield of data handling machine.Then calculate suspension noctilucence particle to be connected relative displacement corresponding to two moment, finally draw the average velocity between these two connected moment.
The present invention has the advantage that equipment is simple, simple to operate, good stability, measuring accuracy are high, method applicability is strong.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a fluid 3D velocity field measuring system, it is characterized in that: comprising: experimental trough, suspension noctilucence particle, vertical CCD industrial camera, horizontal CCD industrial camera, data handling machine, be provided with in described experimental trough and treat fluid measured, described in treat in fluid measured, to be evenly distributed with suspension noctilucence particle; Described vertical CCD industrial camera is arranged on directly over experimental trough, and described horizontal CCD industrial camera is arranged on experimental trough side, for taking the distribution plan in suspension noctilucence particle each moment in process fluid flow to be measured; Described data handling machine is connected with vertical CCD industrial camera, horizontal CCD industrial camera, and for the distribution plan of suspension noctilucence particle is converted to character matrix, and coupling obtains treating fluid measured 3D velocity field.
2. a kind of fluid 3D velocity field measuring system according to claim 1, is characterized in that: described suspension noctilucence particle arranges water droplet structure.
3. a kind of fluid 3D velocity field measuring system according to claim 1, is characterized in that: the density of described suspension noctilucence particle is identical with treating the density of fluid measured.
4. a kind of fluid 3D velocity field measuring system according to claim 1, is characterized in that: the color of described suspension noctilucence particle comprises multiple color.
5. a kind of fluid 3D velocity field measuring system according to claim 1, is characterized in that: described experimental trough adopts transparent material.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108398572A (en) * | 2018-02-08 | 2018-08-14 | 上海理工大学 | Particle image velocimetry method and device based on Wei Nuotu |
| CN110631944A (en) * | 2019-09-27 | 2019-12-31 | 国家电网有限公司 | Underwater material scouring three-dimensional effect experimental device and method |
| CN112986066A (en) * | 2021-02-08 | 2021-06-18 | 清华大学 | Experimental device for be used for studying dust particle resuspension law |
| CN113137992A (en) * | 2021-03-25 | 2021-07-20 | 中南大学 | High-temperature fluid mass flow online detection method, device and system |
| CN115684642A (en) * | 2023-01-04 | 2023-02-03 | 河海大学 | Water tank test surface flow field measurement method and system based on fluorescent tracer particles |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398572A (en) * | 2018-02-08 | 2018-08-14 | 上海理工大学 | Particle image velocimetry method and device based on Wei Nuotu |
| CN110631944A (en) * | 2019-09-27 | 2019-12-31 | 国家电网有限公司 | Underwater material scouring three-dimensional effect experimental device and method |
| CN110631944B (en) * | 2019-09-27 | 2022-08-05 | 国家电网有限公司 | Underwater material scouring three-dimensional effect experimental device and method |
| CN112986066A (en) * | 2021-02-08 | 2021-06-18 | 清华大学 | Experimental device for be used for studying dust particle resuspension law |
| CN113137992A (en) * | 2021-03-25 | 2021-07-20 | 中南大学 | High-temperature fluid mass flow online detection method, device and system |
| CN113137992B (en) * | 2021-03-25 | 2022-02-18 | 中南大学 | High-temperature fluid mass flow online detection method, device and system |
| CN115684642A (en) * | 2023-01-04 | 2023-02-03 | 河海大学 | Water tank test surface flow field measurement method and system based on fluorescent tracer particles |
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