3D velocity field reconstruction of gas-liquid two-phase flow based on space-time multi-scale binocular-PIV technology

Abstract

for particle image velocimetry (PIV) technique, the two-dimensional (2D) PIV by one camera can only obtain 2D velocity field, while three-dimensional (3D) PIV based on tomography by three or four cameras is always complex and expensive. In this work, a binocular-PIV technology based on two cameras was proposed to reconstruct the 3D velocity field of gas-liquid two-phase flow, which is a combination of the binocular stereo vision and cross-correlation based on fast Fourier transform (CC-FFT). The depth of particle was calculated by binocular stereo vision on space scale, and the plane displacement of particles was acquired by CC-FFT on time scale. Experimental results have proved the effectiveness of the proposed method in 3D reconstruction of velocity field for gas-liquid two-phase flow.

DIC measurement method based on binocular stereo vision for image 3D displacement detection

“…In the modern industrial society, with the rapid development of Digital Image Correlation Method (DIC) based on Binocular Vision Ranging technology (BVR), users can remotely measure the displacement of large civil elements, and then judge the safety of the structure through its deformation [1,2]. To accurately calculate the displacement of the mechanical structure, BVR sets up two cameras, which are placed in a triangular shape with the target to be measured.…”