基于数字粒子图像测速的水雾粒径测量算法及实验

Algorithm and experiment on droplet sizing based on DPIV

针对利用传统数字粒子图像测速(DPIV)法测量水雾粒径时粒子影像拉长对测试结果的影响,提出了基于DPIV建立的改进图像法(IIM)。设计了水雾粒径测量试验系统,对细水雾进行实时测试,并对比了采用本文算法与直接等效法测试水雾粒径子半径的差异。结果表明:采用本文的IIM得到的测试结果更为准确。通过最小二乘法对粒径分布进行拟合,发现对数正态分布函数和威布尔函数都可以较好地描述粒径分布。

When traditional Digital Particle Image Velocimetry （DPIV） is used to measure water spray parti- cles, the elongated image from a common CCD will effect the measuring results. To eliminate the effect of the elongated image of water spray particles, an Improved Image Method （IIM） was built based on DPIV. An ex- periment system was designed to make a real-time test for the water spray, by which the difference of measured particle sizes obtained by the improved image method and the direct equal method was contrasted. The results show that the algorithm used in this paper is more available to measure the radius of water spray particle. The radius distribution curve is fitted by least square method, which shows that both the lognormal function and Weibull function can describe the radius distribution well.