超燃冲压发动机隔离段流场数值模拟

隔离段是双模态超燃冲压发动机实现双模态和模态转换的一个重要部件,同时,它把进气道和燃烧室隔离开,以防止燃烧室工作对进气道干扰,引起进气道不启动。由于隔离段内气体流动的复杂性及其广泛的工程应用前景,隔离段内的流动特性引起了人们的广泛关注。本文使用隐式TVD格式,采用雷诺应力湍流模型,近壁面采用非平衡壁面函数方法处理,控制方程的离散采用二阶迎风格式,对隔离段内的流场进行了数值模拟,并分析了出口反压、来流马赫数对隔离段内流场的影响。

A Numeracal Simulation of the Flow Field in Scramjet Isolator

Isolator is a key component of scramjet to complete dual-mode and mode transition. The phenomenon of supersonic flow in isolator duct has been of great interest for decades due to both the complexity in aerodynamics and its wide engineering application.In this paper, the flow fields within scramjet engine isolator has been simulated using TVD scheme. The current version of this code employs Reynolds stress turbulence model, second order upwind interpolation scheme, and coupled implicit method. The effect of back pressure and Mach number on isolator flow fields are also analyzed and discussed.