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为从定量上研究超燃冲压发动机多凹腔燃烧室对增强混合、燃烧的影响,用大涡模拟方法和火焰面模型对燃料当量比为0.062的流场进行数值模拟。比较了不同多凹腔构型对混合效率、燃烧效率和总压损失的影响,并结合壁面压力分布、数值纹影解释了其原因。结果表明,凹腔串联、凹腔并联均能增强混合,混合效率最大可提高20.95%和9.52%;凹腔串联、凹腔并联均能增强燃烧,燃烧效率最大可提高14%和16.94%;燃烧时凹腔串联总压损失最小,但凹腔并联燃烧放热最快,对缩短燃烧室长度有利。
In order to quantitatively study the effect of multi-cavity combustion chamber on enhanced mixing and combustion in a scramjet, a large eddy simulation method and a flame surface model were used to simulate the flow field with fuel equivalent ratio of 0.062. The effects of different multi-cavity configurations on the mixing efficiency, combustion efficiency and total pressure loss were compared. The reason was explained with the wall pressure distribution and numerical grain stripe. The results show that the cavity can be mixed in series and in parallel, the mixing efficiency can be increased by 20.95% and 9.52% at most. The concoction of cavities in series and cavities can enhance the combustion efficiency, the combustion efficiency can be increased by 14% and 16.94% When the total cavity pressure loss in series with the smallest, but the cavity parallel combustion heat the fastest, shorten the length of the combustion chamber beneficial.