三维射流PIV图像处理方法的研究及其精度分析

An Algorithm for the Three-Dimensional PIV Based on Cross-Correlation Analysis

本文利用三台照相机系统记录三维射流的流动 ,通过照相机系统的标定、三维空间粒子的重构、空间粒子的对应及误对应向量的判断和消除等 ,建立了一种三个图像记录设备组成的三维 PIV图像处理算法 ,并对其精度进行了分析 ,通过对三维射流图像的处理和分析表明 ,该方法是切实可行的 .

Three CCD cameras are used to record the images for a three-dimensional jet flow. Based on the images, an algorithm for three-dimensional PIV is developed, which includes the calibration of camera system, the reconstruction of particles coordinates, the stereo particles matching and the determination and deletion of spurious velocity vectors, etc. In this method, the equations relating the particle positions in image and research space are constructed, and a method for stereo particle matching is developed. The standard three-dimensional image data that are produced by Visualization Society of Japan is compared with this method. The results show that this method has the merits of high accuracy and strong reliability.