轴对称突扩直管流场计算

THE CALCULATION OF FLOW FIELD IN A AXISYMETRY CENTRAL DUMP COMBUSTER

关键词:  固体火箭发动机  尾喷管  轴对称流  流场

Key words:  Solid rocket engine  Jet nozzle  Axisymmetric flow  Flow field

摘要:

本文是为喷管喉部沉积问题的研究而进行的喷管突扩流场研究工作的一部分,重点研究了产生突扩流效应的轴对称直管流场.在等粘度和k-ε紊流模型下,分别计算了三种速度分布下的流场,和国内外相关实验结果及Spalding,D.B.的计算结果进行比较,取得了满意的结果.同时考察了动边界下流场的变化,实现了突扩流效应的理论预测.本文考察了SIMPLE方法.在源项处理、方程的非线性、方程的解法等方面做了分析研究和计算工作,解决了一些具体应用问题.

Abstract:

The study in this paper is a part of the research work about flow field in a central dump combuster for solving the problem of nozzle throat sedimentation. According to the k-ε kinetic turbulent model and the condition of constant viscosity,the flow fields under three different kinds of velocity distributions are computed.The results,compared with the experimental data obtained from home and abroad and the computational results by spalding, are very satisfactory. At the same time, some attention has been given to the change of flow field under moving boundary conditions in order to predict the effect of sudden expansion flow theoretically.The SIMPLE method has been used to solve the flow field discribed by a set of nonlinear partial differential equations, and the source iterms in the equations are handled delicately.