Abstract: To evaluate the feasibility for utilizing the detonation wave to stabilize flame in scramjet combustor,the detonation wave characteristic in high temperature environment was studied by numerical simulations. A new initiation mechanism of detonation was presented. The premixed gas injected into high temperature supersonic flow can reach local thermal choking state through the heat released by slow reaction of premixed fuel gas and then a detonation wave can be initiated by shock produced in thermal choking state. The numerical results show that the fuel injected into high temperature supersonic flow can form a standing detonation wave by the new mechanism in some special temperature and Mach number flow conditions. The research shows that it is possible utilizing the standing detonation wave to stabilize flame in scramjet combustor. 

Key words: Thermal choking; Detonation wave; Initiation mechanism

摘要： 通过对高温超声速流中爆震波性质的研究,评估其在高超声速冲压发动机燃烧室的燃烧组织中应用的可行性,并通过数值模拟对分析结论进行了验证。提出了一种新的爆震波起爆机制,注入高温超声速流中的燃料混气可通过自身缓慢的释热使流动进入局域热壅塞状态,进而借助局域热壅塞产生的激波实现爆震波的起爆。计算结果表明在适宜的温度与马赫数条件下,注入高温超声速流中的燃料可通过新的起爆机制在超声速流中形成一道稳定的驻定爆震波。表明在高超声速冲压发动机燃烧室中存在着通过驻定爆震波实现火焰稳定的可能性。

关键词: 热壅塞;爆震波;起爆机制