基于PIV技术的磨料水射流中固体磨料粒子速度分布实验研究

为了解决磨料射流磨料速度测试难问题，本文基于PIV技术，结合图像处理与滤波分析技术，提出了一种测量磨料射流磨料速度的非接触式测试方法。该方法能同时得出磨料速度以及磨料在射流中的位置信息。利用该方法对磨料射流进行磨料速度测试实验，实验结果表明：(1)利用该方法能快速地得到磨料射流中磨料速度；(2)利用该方法得到了磨料在喷嘴出口沿射流方向的速度变化规律，即磨料在喷嘴出口速度先增大后减小，存在速度最大处，意味着磨料射流存在最优靶距；(3)利用该方法得到了磨料沿射流径向的速度变化规律，磨料在射流中心速度最大，其速度从射流中心往射流边界方向逐渐减小，呈现出钟形速度分布。

Experimental study of velocity distribution of solid abrasive particle in abrasive water jet based on PIV technology

In order to solve the problem of measurement of velocity of abrasive in abrasive water jet，based on PIV technology，combined with image processing and filtering analysis technology，this paper presents a non-contact measurement method ,which is a method for measuring the velocity of abrasive in abrasive water jet. The velocity and location information of abrasive in the abrasive water jet can be obtained simultaneously by this method. By using this approach, an abrasive velocity test experiment was carried out, the experimental results show that: (1) This method can get the velocity of abrasive in abrasive water jet quickly; (2) The variation of velocity of abrasive along the jet direction at the nozzle exit has been obtained. The velocity of abrasive at the nozzle exit increases first and then decreases and the maximum speed exists, which means there is an optimal target distance in abrasive water jet. (3) The variation of velocity of abrasive along the jet radial direction at the nozzle exit has been obtained by using this method. The largest velocity of abrasive is in the center of the abrasive jet. And the velocity gradually decreases from the center to the boundary，shows a bell-shaped velocity profile.