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模拟飞行Ma=4.0的超燃冲压发动机的燃烧室进口条件,在直连式试验台上对超燃冲压发动机氢气火花塞点火过程进行了研究。通过高速摄影与高速纹影捕捉了点火过程初始火焰发展与流程波系演化过程。结果表明,初始火焰传播受高速对流、湍流火焰传播和自点火多种机制控制,凹腔结构不仅提供低速环境,还在初始火焰传播过程中具有能量反馈和质量反馈(活化分子)作用,促进剪切层内火焰的发展。
Simulating the combustion chamber inlet condition of a scramjet with Ma = 4.0, the ignition process of hydrogen spark plug of scramjet was investigated on a direct-coupled test rig. Through the high-speed photography and high-speed pattern capture the initial flame ignition process and the evolution of process wave system. The results show that the initial flame propagation is controlled by many mechanisms, such as high-speed convection, turbulent flame propagation and self-ignition. The cavity structure not only provides low-speed environment but also has energy feedback and mass feedback (activation molecule) during the initial flame propagation, The development of flame within the slice.