Abstract: To provide thermal boundaries for the calculation of ablation and temperature fields of the heat resistant construction,particle trajectory model and Jameson scheme of finite volume method were used to simulate the one phase and two phase flow fields for a tail pipe nozzle. The numerical results show that the gas Mach number for two phase is lower than those for one phase at the centerline,the gas temperature for two phase is higher than those for one phase at both the centerline and the wall around the throat and expansion segment, two phase flow should be considered into the design of the heat resistant construction.

Key words: Tailpipe nozzle;Nozzle flow;Two phase flow;Flow distribution;Numerical simulation

摘要： 为了给长尾喷管热防护结构的烧蚀和温度场计算提供准确的热边界条件,从二维轴对称N S方程出发,采用颗粒轨道模型和有限体积的Jameson格式计算了长尾喷管纯气相流场和两相流流场。分析和比较表明:在长尾喷管喉部附近以及扩散段的相同轴向位置,两相流情况下轴线上的燃气马赫数小于纯气相情况下的马赫数,两相流情况下轴线和壁面上的燃气温度大于纯气相情况下的燃气温度;在进行长尾喷管热防护结构设计时应以两相流流场作为热边界条件。

关键词: 长尾喷管;喷管气流;二相流;流动分布;数值仿真