为了实现对气液两相流的粒子粒径、空间分布及其速度测量,对激光干涉气液两相流测量技术(ILIDS)进行了深入研究,该技术是一种应用于气液两相流测量的新技术,其主要优点是不干扰流场和颗粒粒径、位置测量精度高。基于该技术所开发的图像自动处理方法可以利用普通粒子成像测量技术系统拍摄气液两相流的激光散射干涉图像,并利用图像卷积定位、傅里叶变换频率分析及其图像互相关测速等图像处理手段从干涉图像中自动提取粒子的位置、直径和速度信息。为了验证该方法的测量精度,对喷嘴生成的气水两相流进行了测量实验,得到了喷嘴出口处不同区域的粒径、速度矢量的空间分布,并将测得的速度矢量与用粒子成像测量技术方法测得的结果进行对比,证明两种方法测量的平均速度差别仅为0.38％。

In order to obtain the droplet diameter and spatial distribution and velocity of gas-liquid flow, interferometric laser imaging droplet sizing technique (ILIDS) is studied. ILIDS is a novel planar measurement technique for droplet size and velocity vector for spray measurement that has high precision for droplet sizing and localizing. An automatic analysis method, which bases on image convolution localizing, Fourier transform and concise cross correlation algorithm, is developed for obtaining droplets' diameters and velocity of spray by using PIV setup. The method is experimentally tested on the water spray generated by an injector, and the different region of the spray is measured. The velocity field obtained by the method is calibrated by the normal particle image velocimetry (PIV) method, the result shows that the difference between velocity vector by two methods is only 0.38%.