中文摘要：

为分析虹吸式出水管虹吸形成过程中气液两相流动，基于各向同性假设，采用欧拉多相流模型与RNG k-ε湍流模型对一泵站虹吸式出水管虹吸过程中的气液两相流进行了数值模拟。结果表明：虹吸过程中，在虹吸管驼峰段和下降段易产生上、下气囊，对虹吸作用的完成有不利影响。来流流量是影响虹吸形成时间的主要因素，水力驱气阶段和水力挟气阶段可分别用不同的幂函数来表达时间与流量的关系。

英文摘要：

In order to understand the characteristic of the gas-liquid two-phase flow in siphon pipe, based on the homogeneous model in multiphase flow theory of ANSYS CFX software and RNG kεturbulence model, the process of gas-liquid flow for a siphon outlet pipe in pumping station was simulated. Results of simulation showed that the air sacs are easily generated on the shell of siphon pipe when the gas mixed into the water and it has an extremely adverse influence with the siphon finish. Meanwhile, flow rate of the incoming flow is the main factor impacting the siphoning time. At last, the relations between the siphoning time and flow rate for hydraulic driving gas and mixing gas-water processes, according with the power function relationship, were given.