【摘要】 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更多还原

【Abstract】 HPIV technology can realize the measurement of three dimensional velocity ( u,v,w ) in a three dimensional space. Using two Nd: YAG pulsed lasers , two exposures, two symmetry reference lights, and off line holographic technique, three dimensional particle flow field was recorded. Using SPIV technique’s photographic method, two directions’ particle images were obtained for three dimensional calculation. Using cross correlation, the velocity direction was resolved.Using this HPIV system, the three dimensional vortex flow passed diagonally through a cubic box was measured. The measurement of three component velocity in three dimensional flow field was realized.更多还原