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Low-particle-density single-camera particle image velocity measurement method

A particle image velocimetry and particle density technology, applied in the field of measurement, can solve problems such as large errors and achieve the effect of reducing limitations

Pending Publication Date: 2021-10-01
CHINA JILIANG UNIV
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Problems solved by technology

Therefore, the error is large in the measurement of low particle density flow field, and the existing technology needs to be improved

Method used

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Embodiment 1

[0029] Embodiment 1. A single-camera particle image velocimetry method with low particle density mainly consists of two parts:

[0030] One is an optical system that encodes the depth of particles in three-dimensional space into corresponding different colors, and collects color images of particles in the fluid.

[0031] The other part is the reconstruction algorithm, which restores the three-dimensional particle field and the three-dimensional velocity field of the fluid step by step by analyzing the color images taken by the optical system.

[0032] Optical device: Compared with the conventional particle image velocimetry PIV, it uses sheet light to illuminate the particles in the fluid, and then shoots the particles flowing in the fluid through a camera to obtain a color image with low particle density. The difference is that conventional particle image velocimetry PIV often uses a laser light source to obtain a sheet of light perpendicular to the line of sight of the camer...

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Abstract

The invention provides a low-particle-density single-camera particle image velocity measurement method, which comprises the following steps that tracer particles are uniformly scattered into a flow field, a white light source emits a collimated stable white light beam, the light beam passes through a filter to obtain colored sheet-shaped light, the colored sheet-shaped light is emitted into the flow field to illuminate the tracer particles in the flow field, a CCD camera shoots a low-particle-density color particle picture and transmits the low-particle-density color particle picture to an upper computer, the upper computer carries out filtering processing and data downsampling on the low-particle-density color particle picture, the upper computer analyzes and reconstructs the processed low-particle-density color particle picture to obtain a high-particle-density three-dimensional particle distribution probability field, and then performs cross-correlation calculation to obtain a fluid three-dimensional velocity field. According to the low-particle-density single-camera particle image velocity measurement method, the problems existing when a three-dimensional cross-correlation algorithm is applied to a low-particle-density condition in the prior art are solved.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a single-camera particle image velocimetry method with low particle density. Background technique [0002] Fluid motion is very common in nature. The fluid mechanics involved in the design of aircraft and underwater vehicles is closely related to the measurement of fluid. Therefore, mastering the specific motion of fluid is a prerequisite for in-depth research in fluid mechanics. Measurement and analysis of fluid motion State is of great importance and is a key issue in the field of fluids. The flow field measurement technology first appeared in 1904. Prandtl invented the hand-cranked water tank to observe the flow field around different models, and used the flow field display technology to analyze and describe the flow field qualitatively. Research. With the development of science and technology, the velocity of the flow field can be quantitatively measured by different m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/20G06F30/20
CPCG01P5/20G06F30/20G06F2119/02
Inventor 单良施飞杨李浩然孔明熊俊哲刘维洪波郭天太赵军
Owner CHINA JILIANG UNIV
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