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为明晰支板喷射超声速燃烧火焰精细结构,并探索其影响因素,利用自发辐射成像技术和平面激光诱导荧光技术(PLIF)对支板喷射超声速燃烧流场进行研究。结果表明,燃烧室内形成了典型的扩散火焰,且火焰稳定在支板尾部的回流区,宽度与支板厚度处于同等量级;支板厚度和燃料喷注当量比对火焰结构有显著影响,增加支板厚度会使火焰基底变宽,火焰长度变短,有利于燃烧室内部的快速放热和缩短燃烧室长度,增加燃料喷注当量比会使火焰长度增加,燃烧强度增大。
In order to clarify the fine structure of the supersonic combustion flame sprayed by the support plate and explore its influencing factors, the jet flow field of the supersonic combustion was studied by using the spontaneous emission imaging technique and planar laser induced fluorescence (PLIF) technique. The results show that a typical diffusion flame is formed in the combustion chamber and the flame is stable at the backflow zone at the tail of the support plate. The width of the flame is in the same order as the thickness of the support plate. The thickness of the support plate and the equivalence ratio of fuel injection have a significant effect on the flame structure, The thickness of the support plate will widen the flame base and shorten the flame length, which is beneficial to the rapid heat release inside the combustion chamber and shorten the combustion chamber length. Increasing the fuel injection equivalence ratio will increase the flame length and increase the combustion intensity.