摘要
斜爆轰推进可望用于未来高超声速动力系统,通过燃烧模式的改变给发动机带来诸多技术优势.然而,目前对于斜爆轰在受限空间中的波系结构研究较少,特别是对发动机复杂来流条件下的反射波系稳定性缺乏研究.本文基于简化的斜爆轰发动机-燃烧室模型,研究了来流速度突变对斜爆轰反射波系稳定性的影响.数值结果表明反射波系的失稳演化是个长期累积、突然加速的过程,不利于应用,可以通过增加来流马赫数来抑制其发展.当来流马赫数增大时,来流扰动可能使原不稳定反射波系重新稳定.扰动效果取决于来流马赫数增加的时间和幅度,扰动越早、马赫数增加幅度越大,越容易形成稳定的反射波系.通过分析来流扰动作用于斜爆轰波的流场特征,揭示了反射波系的重新稳定的机理,即通过来流扰动抑制了波后亚声速区诱导的流动壅塞.
The oblique detonation engine(ODE)is expected to be used in future hypersonic power systems,bringing many technical advantages to the engine by regulating the combustion mode.However,few studies concern the wave structure of an oblique detonation wave(ODW)in confined spaces,particularly for the stability of reflected wave systems under complex inflow conditions.On the basis of a simplified ODE combustor model,the effects of a changing inflow velocity on the steadiness of the oblique detonation reflected wave system are studied in this paper.The numerical results show that the evolution of the reflected wave system undergoes two processes,including long-term accumulation and sudden acceleration,which is unfavorable for an ODE application and can be efficaciously harnessed by increasing the inflow Mach number.The inflow disturbance aroused by this increase may restabilize the originally unstable reflected wave system,and the effects depend on the time and amplitude of the increase of the inflow Mach number.The earlier the disturbance occurs and the greater the increase in Mach number,the more easily a stable reflected wave system will develop.Furthermore,by analyzing the flow field characteristics of ODWs disturbed by inflow,the re-stabilization mechanism of a reflected wave system is revealed;that is,the flow choking induced by the subsonic zone behind the Mach stem is suppressed by the inflow disturbance.
作者
牛淑贞
杨鹏飞
杨旸
滕宏辉
NIU ShuZhen;YANG PengFei;YANG Yang;TENG HongHui(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;College of Engineering,Peking University,Beijing 100871,China;China Academy of Launch Vehicle Technology,Beijing 100076,China)
出处
《中国科学:物理学、力学、天文学》
CSCD
北大核心
2023年第3期160-172,共13页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金(编号:12002041,11822202)
中国博士后科学基金(编号:2021M700222)资助项目。
关键词
斜爆轰波
马赫反射
马赫数
突变
oblique detonation wave
Mach reflection
Mach number
abrupt changes