PIV中提取速度信息的一种新方法

A new method to extract velocity information in PIV

通过对PIV中粒子图像固有特点的研究，提出了一种新的速度信息提取方法。该方法先通过模拟人眼判断粒子图像中心点的过程来获得粒子的中心点，再利用这些中心点之间的相关关系求取速度。以内燃机缸内流场的PIV实测图像为例，通过与直接FFT变换求相关的方法进行比较，阐明了该方法的特点。

In this paper a new method to extract velocity inform ation using the inherent characteristics of particle images in PIV is demonstra ted. In the method center point of every particle image is indicated firstly by simulating the process of human's judgemennt of the position of a particle, and then by using the correlation relationship between these center points particle moving velocity was calculated. This new method is also compared with the general method in PIV, and is used successfully in practical measurement of incylinder flow field in an engine as a test.