Fortran壅塞式燃气阀芯通道内流场数值研究
关键字 Fortran语言 流体仿真 结构选择 湍流模型 入口条件 出口反压
毕业设计说明书（毕业论文）外文摘要
Title Numerical Investigation of the Flow Field of Choked Gas
Valve Core Channel
Abstract
This paper introduces a simulation research of the flow field in a steerable gas generator.2D symmetrical structured grids and finite volume scheme are used. Steger-warming scheme is used to discretize the convective fluxes. Four classical examples are computed to test the program. The results of inviscid model and turbulence model show that the turbulent eddy viscosity ratio and the turbulent kinetic energy are relatively small, which implies that the turbulence does not have an evident effect on the flow field. The inviscid model is then used to explore the best structure among three models A, B, and C. Model B is proved to have the highest recover coefficient in total pressure. In addition, the inviscid model is used to simulate the flow field in model B to test the influences of total pressure at the entry and the exit. Mach number is not affected by the total pressure at entry, while the distributions of density, local pressure, and total pressure are linear to the total pressure at entry. There is nearly no difference in the flow field with different total pressure at the exit. According to the research on the results above, this paper points out the proper computational model and optimized structure, and the principle to control the flow field by changing the situation at the entry.
Keywords Fortran flow field simulation construction choosing
conditions at entry total pressure at exit
目 次
1 绪论 1
1.1 课题的背景及意义 1
1.2 燃气发生器的发展现状 2
1.3 本文的主要工作 3
2 物理模型和数学方法 4
2.1 物理模型 4
2.2 控制方程 7
2.3 湍流模型 8
2.4 离散方法 11
2.5 边界条件 15
2.6 计算流程 16
3 数值验证 19
3.1 激波管问题 19
3.2 斜激波反射问题 21
3.3 前台阶问题 22
3.4 后台阶问题 24
4 无粘流与粘性流的对比 28
4.1 网格的划分 28
4.2 无粘流与有粘流流动效果的对比 28