论文部分内容阅读
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 realize particle size, spatial distribution and velocity measurement of gas-liquid two-phase flow, the laser interferometric gas-liquid two-phase flow measurement technique (ILIDS) has been studied in depth. The main advantage of the new measurement technique is that it does not disturb the flow field and the particle size, and the position measurement accuracy is high. Based on this technology, the automatic image processing method can take advantage of ordinary particle imaging measurement system to capture the laser scattering interferometric image of gas-liquid two-phase flow and utilize the image convolution localization, Fourier transform frequency analysis and its image cross correlation velocimetry The image processing means automatically extracts the particle’s position, diameter and velocity information from the interference image. In order to verify the measurement accuracy of the method, the gas-water two-phase flow generated by the nozzle was measured and the particle size and velocity vector distribution in different regions at the exit of the nozzle were obtained. The measured velocity vector was compared with the particle image Measurement techniques measured results compared to prove that the two methods of measuring the average speed difference of only 0.38%.