离心泵内气液两相流动的数值模拟与实验研究

Numerical Simulation and Experimental Study of Gas-liquid Two-phase Flow in a Centrifugal Pump

分叶式叶轮由于其叶片的分离和偏移能够很好地处理气液流动而被广泛应用在石油工业中。本文采用叶轮可视化及数值模拟相结合的方法研究了分叶式叶轮内的气液流动特性。在该叶轮中,气团会率先出现在内叶片入口及外叶片的吸力面。气团在延伸至叶片分离和偏移的位置时,受到来自相邻流道流体的冲击。采用欧拉–欧拉模型时,数值模拟得到的叶轮内气液流动与可视化得到的结果基本一致。在叶轮流道中,被气团占据的区域失去了增压能力,而气团未占据的区域仍保留一定的增压性能。

The split vane impeller is widely used in the petroleum industry because the separation and offset of its blades can handle the gas-liquid flow well.In this paper,visualization and numerical simulation are used to study the gas-liquid flow characteristics in the split vane impeller.In the impeller,the gas pocket first appears at the inlet of the inner blade and the suction surface of the outer blade.The gas pocket is impacted by the fluid from the adjacent flow channel as it extends to the position where the blade is separated and offset.When the Eulerian-Eulerian model is used,the gas-liquid flow in the impeller obtained by numerical simulation is consistent with that obtained by visualization.In the impeller channel,the area occupied by the gas pocket loses the pressurization capability,while the area not occupied by the gas pocket still retains some pressurization capability.