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全息粒子图像测速技术(HPIV) 为一种对流体容积( 三维空间) 进行瞬时三维( u ,v ,w) 速度场测量的技术.本项研究采用了双YAG 脉冲激光器二次曝光、漫射照明、参考光对称布置全息术记录三维空间的粒子三维位移场,再现粒子空间场又采用了体视粒子图像测速技术分别截取各切面上的粒子三维位移场,其中由于采用了不同方向的参考光分别再现不同曝光时刻的粒子图像,可以用互相关技术,实行位移方向的自动判别.本项技术用于立方体对角水流中的三维旋涡流动的瞬态三维速度场的初步测量.本文给出了瞬时复杂的三维旋涡部分空间结构和速度场分布图
Holographic Particle Image Velocimetry (HPIV) is a technique of instantaneous three-dimensional (u, v, w) velocity field measurement of fluid volume (three-dimensional space) .This study uses double YAG pulsed laser double exposure, diffuse illumination , Reference symmetrical arrangement holography records the three-dimensional displacement field of the particles in the three-dimensional space, the reproduction of the particle space field and the stereoscopic particle image velocimetry techniques are used to intercept the three-dimensional displacement field of each section, respectively, which uses different directions of the reference light respectively In order to reproduce the particle images at different exposure times, the cross-correlation technique can be used to determine the displacement direction automatically.This technique is applied to the preliminary measurement of the transient three-dimensional velocity field of the three-dimensional vortex flow in the cube diagonal flow.This paper presents the instantaneous Complex three-dimensional vortex part of the spatial structure and velocity field distribution