【摘要】 由空压机提供的气体通过一排微小直径的喷嘴进入静止水体,形成水气两相流流场。在单相PIV和PTV技术的基础上,研究稀疏气液两相流情况下气泡的速度场分布。PIV算法采用快速傅立叶互相关分析法,而PTV算法需要获得每幅图像中每个气泡的形心,根据连续图像中的粒子对,计算速度。用PIV和PTV两种算法处理求出气泡的速度并对两种方法进行比较,其最终研究成果可应用于流体及多相流的流量测技术,提高我们进行低密度气液两相流相关研究的测量水平。同时为水气两相流的数值分析和理论研究提供流场测试的数据。更多还原

【Abstract】 The gas phase was produced by air compressor and entered into still water in the model by little diametical nozzle on line, and the gas-liquid two phase flow field was formed. On the basis of the single phase PIV-PTV technique investigation, the bubble velocimetry measurement of sparse gas-liquid two phase flow was studied. PIV method uses Fast Fourier cross correlation, PTV method needs the center of every air bubble image, finds bubble pairs and then calculates velocity. The study concerns the different features of PIV and PTV technique to measure velocity of air bubble in sparse bubbly flow. The results may be used in measurement of multiphase flow and enhance measurement level of sparse gas-liquid two phase flow. It may offer datas for numerical analysis of flow field.更多还原