Three-dimensional flow field testing method and system based on three-color mask single-color camera

Abstract

The invention discloses a three-dimensional flow field testing method and system based on a three-color mask single-color camera. The method comprises the following steps: acquiring a time sequence particle three-color mask color image of tracer particles in a to-be-tested flow field y using a three-color mask single-color camera; performing three-view image separation processing on the original color particle image to obtain a three-view image of the particle; Performing three-dimensional particle reconstruction on the three-view image to obtain a time sequence three-dimensional particle image; performing cross-correlation calculation on the sequential three-dimensional particle image to obtain three-dimensional flow field velocity field distribution; and post-processing the velocity field of the three-dimensional flow field, rejecting error velocity vectors, and replacing the rejected error vectors according to adjacent correct vector interpolation. According to the method, the three-dimensional speed distribution of the to-be-tested flow field can be obtained through the time sequence image of the single color camera, and compared with an existing multi-view three-dimensional flow field testing method, hardware system configuration is greatly reduced, hardware system adjusting steps are simplified, and the method is particularly suitable for three-dimensional flow field measurement in a limited space.

Description

technical field [0001] The invention relates to the technical field of flow field testing, in particular to a three-dimensional flow field testing method and system based on a three-color mask single-color camera. Background technique [0002] Two-Dimensional Particle Image Velocimetry (2D-PIV) has become a standard flow field testing technology after more than 30 years of development due to its advantages of non-contact and full flow field measurement. It is widely used in many research fields such as basic experimental fluid mechanics, bionic fluid mechanics, aerodynamics, combustion and turbomachinery. However, many flow phenomena in basic research and engineering applications have strong three-dimensional characteristics in nature, and the flow field data of a certain plane is not enough to analyze the complex physical nature of the flow field. Therefore, researchers have been devoting themselves to the development of various full-field three-dimensional flow testing te...

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Problems solved by technology

[0004] The above-mentioned three-dimensional flow field testing techniques either use complex optical path arrangement (such as HPIV), or require multi-camera systems (such as Tomo-PIV, SAPIV), which not only increases the difficulty of the experiment, increases the hardware cost, but more importantly, greatly This limits the application of these techniques in limited optical space and high-response testing, and the calculation accuracy cannot meet the needs

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