【摘要】 数字粒子图像测速技术 DPIV(Digital Particle Image Velocimetry)是一种快速提取流场速度的方法 ,但测速精度较低。已有的改进方法虽然使精度得到了提高 ,却丧失了 DPIV快速处理的优点。本文综合已有方法的优点 ,提出了一种兼有快速和精度较高的处理方法。该方法以 Willert提出的 DPIV方法为基础 ,吸收了 Huang提出的改进方法中的迭代思想 ,既保留了 DPIV快速处理的优点 ,又在一定程度上提高了测速的精度 ,非常适合于多工况和非恒定流的测量。更多还原

【Abstract】 The DPIV (Digital Particle Image Velocimetry) is a kind of method to obtain velocity fields quickly. But the accuracy of this method is not high. Although the improved methods improve the accuracy greatly, but they lost the advantage of fast processing of DPIV. In this paper, a new method is presented which has the both advantages of fast processing and high accuracy. This new method is based on the DPIV technique which was presented by Willert, and absorts the idea of iteration in Huang′s improved method. So the method maintains the advantage of fast processing of DPIV and improves the accuracy to certain extent. It fits for measurements of velocities in constant and tidal flow.更多还原