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对固体燃料超燃冲压发动机燃烧室中PMMA的燃烧过程进行了基于动网格技术的非稳态数值仿真研究。基于超声速流中的耦合传热及质量注入建立了固体燃料燃烧的数值模型,研究了燃烧室构型和进气总温对固体燃料燃烧特性的影响。结果表明:和实验数据对比证实了本文数值模型的正确性。固体燃料超燃冲压发动机能够实现自点火建压和维持燃烧。在燃烧过程中,装药壁面燃速分布不均匀,凹腔逐渐变得扁平。随着主流流速增加和通道的扩大,凹腔的火焰稳定能力降低,直至熄火。初始凹腔较深、进气总温较高时有利于稳定火焰。当进气总温提升400K时,工作时间和燃料消耗量提高1.8倍。
The unsteady numerical simulation of PMMA combustion in a solid fuel scramjet engine combustor was studied based on moving grid technology. Based on coupled heat transfer and mass injection in supersonic flow, a numerical model of solid fuel combustion was established. The effects of combustion chamber configuration and total inlet air temperature on the combustion characteristics of solid fuel were investigated. The results show that the comparison with the experimental data proves the correctness of the numerical model in this paper. Solid fuel scramjet engines enable self-ignition build-up and maintain combustion. Burning process, the combustion wall uneven distribution of fuel burning, the cavity gradually becomes flat. As the main flow rate increases and the passageway expands, the cavity’s flame holding capacity decreases until flameout. The initial deep cavity, the total inlet air temperature is conducive to stabilizing the flame. When the total temperature increase 400K intake, working hours and fuel consumption increased 1.8 times.