应用PIV技术测量二维瞬时流场

The Measurement of 2-D Instantaneous Flow Field by PIV

本文应用PIV技术对循环水槽中两种工况下进行了二维瞬时流场测量。在双脉冲激光片光源照射的平面流场中,得到了清晰的粒子位移照片,采用杨氏条纹法精确地测量了整个二维瞬时流场。本文还采用粒子像模拟技术,用几种图像处理方法:傅里叶变换法、空间自相关法和位移距离概率统计法分别进行处理,得到了相同的结果。

This paper presents the measurement of 2-D instantaneous flow field in an enclosed water channel by PIV. The particle displacement images within flow field illuminated by double pulses laser sheet were recorded using photographic film. The measurements of 2-D velocity field can be made by 'Young's fringe' method. The simulation method of artificial particle image pairs are presented. The results extracted from Fourier transform method, spatial correlation method and probabilistic method of displacement between particle images.