凹腔喷射超声速燃烧火焰结构实验研究

Experimental Investigation on Supersonic Combustion Flame Structure with Cavity Injectors

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。

To understand supersonic combustion flame structure with cavity injectors more deeply, the supersonic combustion flowfield of H2 injected from upstream wall of cavity was investigated using OH radi- cal spontaneous emission imaging and planar laser induced fluorescence（PLIF） imaging. The results show that flame is mainly located in vicinity of cavity shear layer and the jet while no flame is observed at exit of injection orifice. The equivalent ratio of fuel, location of fuel injection and cavity configuration have numeri- ous effect on flame structure, which should be considered at design of combustion chamber.