水平管内气液两相流界面湍流各向异性分析

Analysis of the turbulence anisotropy characteristic in the interface of gas-liquid two phase flow in horizontal tubes

摘要:

为探讨水平管内气液两相流湍流模型如何选择，提出水平管内气液两相流界面湍流为各向异性的猜想，分析了该界面湍流各向异性产生和发展的机理，指出界面湍流各向异性产生的湍流惯性力是水平管环状流形成的重要原因.通过比较二方程模型和雷诺应力模型（RSM）模拟同一个水平管环状流工况的结果来验证分析的正确性，在此基础上探讨了气液两相流湍流模型的选择依据.结果表明当水平管内气液剪切力较大时适合选用RSM模型，其他情况二方程模型和RSM模型均适用.

Abstract:

In order to explore how to choose the turbulence model of the gas-liquid two phase flow in a horizontal pipe, the guess that the turbulence of the interface of the gas-liquid two phase flow in a horizontal pipe is anisotropic was put forward. The emergence and development mechanism of the turbulence anisotropy in the interface was analyzed. It points out that the turbulence inertial force generated by the turbulence anisotropy in the interface is an important reason for the formation of annular flow in a horizontal tube, which was verified by comparing the simulation results of using the two-equation model and Reynolds stress model (RSM) to simulate the same working condition of annular flow in a horizontal tube. On such basis, the basis of selecting turbulence model in gas-liquid two phase flow was discussed. The results show that the RSM model is adaptive for large gas-liquid shear stress in a horizontal pipe, while the two-equation model and RSM model are both adaptive for other conditions.