中文摘要：

提出了一种在高空隙率下气液两相流中气泡速度场的图像分析方法。该方法基于应用多重空间分辨率，也就是回归相关PIV法（RCC—PIV）计算气液两相流中气泡的速度。通过比较一些PTV和PIV的算法，回归相关能得到最好的关于气泡光学和动力学特性的测定结果，肯定了本算法的适用性。研究结果表明：气泡速度高频率的振动发生在剪切层和上表面附近，而低频振动在实验装置的中部占优。

英文摘要：

An image analysis method for measuring bubble velocity fields at high bubble number density is proposed. It is based on computing the velocity of bubbles in gas-liquid two-phase flow with multiple spatial resolutions, i.e. a RCC-PIV technique. Comparing several PTV and PIV schemes, it is confirmed that the RCC-PIV leads to the best measurement results about the optical and dynamic characteristics of bubbles. The applicability of this method is verified. The results reveal that the frequency fluctuations of bubble velocities grow in the shear layer and near the top surface, while low frequency fluctuation dominate in the middle part of the tank.