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采用大涡模拟耦合预混燃烧方法,建立了液体冲压发动机不稳定燃烧计算模型。对模型发动机进行了不稳定燃烧数值研究,计算得到的发动机内压强振荡和火焰传播过程与文献中的实验数据吻合较好。结果分析表明,突扩构形发动机内大尺度的旋涡结构支配了燃烧室中的火焰传播过程,旋涡运动耦合非稳态的燃烧热释放是激发燃烧室低频压强振荡的重要原因。
A large eddy simulation coupled premixed combustion method was used to establish the unsteady combustion calculation model of liquid ramjet. The numerical simulation of the unstable combustion of the model engine was carried out. The calculated pressure oscillation and flame propagation in the engine agree well with the experimental data in the literature. The results show that the large-scale vortex structure in the sudden expansion configuration engine dominates the flame propagation in the combustion chamber. The unsteady combustion heat release is the important reason for the low-pressure oscillation in the combustion chamber.