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为加深对凹腔喷射超声速燃烧火焰结构的认识,利用OH基自发辐射成像和PLIF技术对凹腔上游横向喷注氢气的超声速燃烧流场进行研究。结果表明,火焰主要分布在凹腔剪切层附近及喷流内部,喷口附近没有火焰;燃料喷注当量比、燃料喷注位置及凹腔构型对火焰分布和火焰强度影响较大,在设计燃烧室时应加以考虑。
In order to deepen the understanding of supersonic combustion flame structure of cavity injection, the supersonic combustion flow field of lateral injection of hydrogen upstream of the cavity was studied by using OH radical spontaneous radiation imaging and PLIF technique. The results show that the flame is mainly distributed near the shear layer of the cavity and inside the jet, and there is no flame in the vicinity of the jet. The fuel injection equivalence ratio, the location of the fuel injection and the configuration of the cavity have a great influence on the flame distribution and flame intensity. Combustion chamber should be considered.