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A Surface Flow Field Measurement Method Based on Particle Image Velocimetry

A particle image velocity measurement and measurement method technology, applied in fluid velocity measurement, velocity/acceleration/impact measurement, measurement device, etc., can solve the problems of slow multi-channel data analysis, low measurement efficiency, flow field interference, etc. Convenience and application range, the effect of eliminating manual installation and debugging, and reducing measurement costs

Active Publication Date: 2020-03-20
上海厉鲨科技有限公司
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AI Technical Summary

Problems solved by technology

At present, the single-point flow velocity measurement device commonly used in the industry not only interferes with the flow field during measurement, resulting in measurement errors; but also because the measurement efficiency is too low, it is difficult to apply to the flow field analysis of large-scale river engineering models and unsteady flow. field analysis
[0003] Moreover, the existing surface flow velocity measurement methods mainly have the following disadvantages: (1) the video acquisition equipment must work at an angle perpendicular to the flow velocity surface, which requires high external lighting conditions, and the operation process is complicated; (2) multi-channel The data analysis speed is slow and the measurement accuracy is not high enough; (3) The cost of tracer particles used in most flow field velocity measurement systems is relatively high

Method used

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  • A Surface Flow Field Measurement Method Based on Particle Image Velocimetry
  • A Surface Flow Field Measurement Method Based on Particle Image Velocimetry
  • A Surface Flow Field Measurement Method Based on Particle Image Velocimetry

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Embodiment Construction

[0044] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0045] Such as figure 1 As shown, a surface flow field measurement method based on particle image velocimetry, the specific steps are:

[0046] Step 1: Spread tracer particles of unlimited material and size on the surface of the flow field to be measured;

[0047] In the specific implementation, this example uses the scraps of tracer particles used in the test, and uses natural light for lighting, which is almost zero cost and easy to operate.

[0048] Step 2: Set at least one field of view in the flow field to be measured, and use the following method to obtain the flow velocity of each field of view:

[0049] Step 2-1: performing multiple video image sampling on the field of view, and then correcting the field of view to establish a corresponding bird's-eye view;

[0050] In this example, the video image is collecte...

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Abstract

The invention discloses a surface flow field measuring method based on particle image speed measurement. The method comprises that tracer particles of undefined materials and sizes are dispensed in the surface of a flow field to be measured; the flow field to be measured is provided with at least one visual field, video images are sampled from the visual field, visual field rectification is carried out on the video images, and then corresponding bird's-eye views are established; each bird's-eye view is divided into multiple sub grids, and the flow speeds of corresponding sub grids in all the bird's-eye views are averaged to obtain a flow speed of the visual field; and data splicing and visualization are carried out on the flow speeds of multiple visual fields successively to A visualized flow speed image of the surface of the flow field to be measured. and a PIV technology is used to measure the flow speed of the surface flow field. The method has the advantages that a video collector is free in the visual angle, robustness for complex landform and external illumination is high, and requirements of different test environments can be met; the tracer particles of any type can be supported; and the analysis speed and the measuring precision are high.

Description

technical field [0001] The invention relates to the technical field of water conservancy measurement, in particular to a surface flow field measurement method based on particle image velocity measurement. Background technique [0002] Velocity measurement of surface flow field is an important means of river engineering model analysis, and also a basic technology in the field of water conservancy measurement. At present, the single-point flow velocity measurement device commonly used in the industry not only interferes with the flow field during measurement, resulting in measurement errors; but also because the measurement efficiency is too low, it is difficult to apply to the flow field analysis of large-scale river engineering models and unsteady flow. field analysis. [0003] Moreover, the existing surface flow velocity measurement methods mainly have the following disadvantages: (1) the video acquisition equipment must work at an angle perpendicular to the flow velocity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P5/20
CPCG01P5/20
Inventor 李正浩杨美玲吴俊周杨艾竹李伟红龚卫国杨利平
Owner 上海厉鲨科技有限公司
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