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Laser particle image speed measuring data processing method based on moving boundary self-recognition

A particle image velocity measurement and data processing technology, applied in image data processing, image analysis, measurement devices, etc., can solve the problem of inaccurate measurement of moving boundary velocity flow field, achieve wide application prospects and benefits, and improve calculation accuracy.

Inactive Publication Date: 2019-03-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] In order to solve the problem of inaccurate measurement of the velocity flow field at the moving boundary in the prior art, the technical problem to be solved by the laser particle image velocimetry (PIV) data processing method based on the self-identification of the moving boundary disclosed by the present invention is: to improve the velocity flow field at the moving boundary measurement accuracy

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  • Laser particle image speed measuring data processing method based on moving boundary self-recognition
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  • Laser particle image speed measuring data processing method based on moving boundary self-recognition

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Embodiment 1

[0029] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the laser particle image velocimetry data processing method based on the self-identification of the moving boundary disclosed in this implementation includes the following steps: taking a PIV picture containing laser particles through a PIV camera, obtaining the gray value of the PIV picture, and establishing a PIV picture. In the Carl coordinate system XOY, the gray value of the PIV picture is established as a data matrix; the boundary pixel point 2 in the PIV picture is judged and identified according to the boundary judgment criterion, and the boundary pixel point 2 is connected to obtain the boundary 1 of the measured object in a moving state; according to Boundary 1 and the normal direction vertical to Boundary 1 establish a new SN coordinate system 3, the S coordinate of SN coordinate system 3 is the boundary direction, and the N coordinate is the normal direction of Boundary 1; then perform coordinat...

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Abstract

The invention provides a laser particle image speed measuring data processing method based on moving boundary self-recognition, and belongs to the technical field of hydromechanics experiments. A PIVimage containing laser particles is shot by a PIV camera, image gray values are acquired, and a data matrix is established by the gray values of the PIV image; boundary pixel points in the PIV image are judged and recognized according to a boundary judgment criterion, the boundary pixel points are connected, and a boundary of a measured object in a moving state is acquired; a new SN coordinate system is established according to the boundary and the normal perpendicular to the boundary; the PIV image is subjected to coordinate conversion, data obtained after coordinate transformation of the PIVimage is acquired, and a capture window when the data obtained after coordinate transformation is subjected to correlation calculation always clings to the moving boundary, then a speed vector is acquired by the data obtained after coordinate transformation through a standard correlation calculation algorithm, the speed vector is subjected to coordinate inverse transformation, and a speed flow field of the measured object is acquired. The measuring precision of the speed flow field of the moving boundary is improved.

Description

technical field [0001] The invention relates to a laser particle image velocity measurement data processing method based on dynamic boundary self-identification, and belongs to the technical field of fluid mechanics experiments. Background technique [0002] In the field of aerospace, in order to avoid dynamic stall, structural flutter and resonance, the dynamic characteristics of oscillating airfoils have been paid more and more attention. In the study of hydraulic machinery, the additional force generated by the rotation and the disturbance of the static and dynamic components have an important impact on the turbulent flow process, the development of the boundary layer, and the temporal and spatial distribution of the flow structure. It is the focus and difficulty of the research. In the transient process of propeller, turbo pump, hydraulic turbine start-up and shutdown, runaway, load increase and decrease, etc., the transient flow in the transient process will change the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/22G06T7/00G06T7/13
Inventor 王国玉张孟杰黄彪吴钦
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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