曝气池中气液两相流速度场分布的实验研究与数值模拟

Experimental research and numerical simulation on gas-liquid two-phase flow of bubble velocity distribution in aeration tank

气液两相流广泛存在于水利工程、废水处理等领域,其在气液装置中的流型流态及速度场分布可直接影响装置运行效能。本文采用实验研究与数值模拟相结合的方法,对圆柱形气液装置进行PIV实验,获得了准确的气液两相流气相速度场分布;在充分考虑湍流、曳力、升力、湍流分散力等作用下,采用欧拉-欧拉双流体模型和气泡群平衡模型对气液两相流流场进行了数值模拟,并将模拟结果与实验结果进行验证,所得结果误差控制在10%左右。结果表明,本文提出的模拟方法在气液两相流模拟中能够得到较准确的两相流动规律和速度场分布情况。

The gas-liquid two-phase flow widely exists all over the industry sectors,such as hydraulic andwastewater treatment projects. The flow patterns and velocity field distributions can directly affect the opera-tion devices performance,which are studied in this article employing the numerical simulation along withexperimental research. A PIV experimental study of gas-liquid two-phase flow has been carried on a cylin-drical experimental device,and the gas velocity vector fields are obtained accurately by image processingand particle image velocimetry technology. After considering the situations of turbulence and interphase forc-es,by using the Euler-Euler two-fluid model and bubble population balance model（BPBM）,numericalsimulations of two-phase flow are performed and compared with experiment results,the error of mathemati-cal models is about 10%. The research result shows that the proposed model and calculation method canachieve accurate result of flowing regularity and velocity distributions in gas-liquid two-phase flow.