【摘要】 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,以防止燃烧室高压干扰进气道,引起进气道不启动。为了更清楚地捕捉流道内复杂激波链,本文使用三阶精度迎风MUSCL格式,K-湍流模型,对隔离段进行了数值计算。考虑到燃烧室的不同结构,本文主要针对几种燃烧室结构模型中隔离段抗反压能力进行了计算比较分析,特别是台阶结构可以有效的缓解燃烧室压力对隔离段的影响。更多还原

【Abstract】 Isolator is a key component of scramjet to achieve dual-mode and mode transition,and it separates inlet from combustion chamber to prevent the effect of combustion back pressure on inlet,because the back pressure could result in non-start for engine.In this paper,the flow fields inside isolator has been simulated using three order up-wind MUSCL sche-me,and K-turbulence model,so it is easy to catch the shock train in the isolator flow field.The resistance pressure ability of different combustion chamber structure on flow fields will be computed and analyzed.Especially step structure could pre-vent the effect that pressure of combustion chamber transfer to isolator.更多还原