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在超燃冲压发动机扩张型燃烧室中,对凹腔内局部补氧的点火强化方法进行了试验研究。采用高速摄影手段研究了不同的补氧方式对凹腔内火焰分布特征和燃烧强度的影响,并针对并联双凹腔燃烧室构型,研究了在单侧凹腔补氧条件下向异侧凹腔的火焰传播过程。试验结果表明,采用凹腔内补氧的方式能调节凹腔内的燃料浓度分布、改善凹腔内的燃烧过程,控制燃烧放热强度;稳态燃烧情况下,观察到凹腔驻留火焰的两种存在特征,分别表现为:由回流区热量反馈机制作用下的凹腔局部驻留火焰和燃烧室全局压力反馈影响下的凹腔剪切层火焰。只有在单侧凹腔燃烧建立了全局压力反馈的条件下才能实现凹腔火焰的异侧传播。
In the scramjet engine dilatational combustion chamber, the ignition enhancement method of partial oxygenation in the cavity was studied. The effects of different oxygenation modes on the flame distribution and combustion intensity in the cavity were studied by high-speed photographic method. According to the configuration of the double-chamber combustor in parallel, Cavity flame propagation process. The experimental results show that the method of supplying oxygen in the cavity can adjust the fuel concentration distribution in the cavity, improve the combustion process in the cavity, and control the combustion exothermic intensity. In steady state combustion, it is observed that the cavity resides in the flame The two existing features are as follows: the cavity shear layer flame under the influence of the local cavity-resident flame and the global pressure feedback of the combustor under the feedback mechanism of the heat flow in the reflow zone respectively. Only in the unilateral cavity combustion to establish a global pressure feedback under the conditions of the cavity flame can spread sideways.