弯头曲率半径对π形管内气液两相流动影响研究

Influence Study of Curvature Radius of Elbow on Gas-liquid Two-phase Flow inπ-shaped Pipe

文中基于气液两相流理论,对水平放置的π形管进行丙烷-水两相混输模拟研究。通过欧拉模型以及Realizable k-ε湍流模型对不同弯头曲率半径条件下π形管管壁含气率分布、湍动能分布以及剪切力分布进行研究。结果表明:输送过程中,气相在重力作用下逐渐聚集在水平π形管顶部,聚集程度随着π形管曲率半径的增大而增大;气液两相流动在管壁产生的剪切力和湍动能随着弯头曲率半径的增大而减小。此外,气液两相流速的增大,能够改善丙烷在π形管顶部的聚集程度并增大管壁湍动能和剪切力。

The simulation of propane-water two-phase mixing transport inπ-shaped horizontal pipe was studied based on the gas-liquid two-phase flow theory.Euler model and Realizable k-εturbulence model were used to study the gas-holding distribution,turbulent kinetic energy distribution and shear stress distribution onπ-shaped pipe wall under different radius of curvature of elbow.The results show that the gas phase gradually accumulated at the top of the horizontalπ-shaped pipe under the influence of gravity,and the degree of aggregation increased with the increase of the curvature radius of theπ-shaped pipe.The shear stress and turbulence kinetic energy of gas-liquid two-phase flow on the pipe wall decreased with the increase of the radius of curvature of the elbow.In addition,the increase of gas-liquid two-phase flow rate can improve the aggregation degree of propane at the top ofπ-shaped pipe and increase the turbulent kinetic energy and shear stress on the pipe wall.