空间发动机推力室气相流动分布无量纲表达方法

摘要： 为探究空间发动机推力室气相流动分布简便表达机制，开展推力室气相介质流动相似性分析.构建空间发动机推力室气相介质流动数值模型，并计算典型结构和工况条件下气相介质流动速度和压力；根据量纲分析方法推导推力室气相介质流动相似准则，借助相似准则提出推力室气相介质流动速度和压力的无量纲表达方法；以正交试验方案组织多种结构和工况参数下的推力室气相介质流动数值计算，并以数值计算结果为输入确定了气相介质流动速度和压力的无量纲表达式.

Dimensionless Expression of Gas Flow in the Thrust Chamber of Space Rocket Engine

Abstract：To explore a convenient expression of gas flow in the thrust chamber of space rocket engine, the similarity analysis of gas flow in the thrust chamber is carried out. Firstly, a numerical model is built to describe the gas flow in the thrust chamber, and the gas flow velocity and pressure are calculated under typical structure and operating conditions. Secondly, the similarity criteria of gas flow are derived based on dimensional analysis. The dimensionless expression method of gas flow velocity and pressure in thrust chamber is promoted with the similarity criteria. Then the numerical calculation under various structure and operating parameters is organized with an orthogonal design plan. Lastly, the dimensionless expression of gas flow velocity and pressure is obtained with the numerical results as input.