摘要
A strut/wall combined fuel injection scheme was experimentally investigated in a flush-wall scramjet combustor fueled with liquid kerosene. A thin strut was adopted as fuel injector and flame holder, and wall injectors were also placed on side wall of the combustor, downstream of the strut. With the injection of pure oxygen through the injectors in the trailing edge of the strut, a stable flame was achieved in the combustor, and the flame interaction characteristics were experimentally investigated. Experiments were conducted at the inlet of Mach number 2.0 with different strut/wall fuel distribution schemes. Flame was divided into two parts, namely the core flame and the wall flame, and interaction mechanism between the two parts was experimentally investigated. Experiment results show that core flame is enhanced with the increasing of fuel equivalence ratio. Core flame propagates to side wall of the combustor to ignite wall fuel, forming a wall flame. Wall flame leads to a thermal chocking at the downstream of strut to enhance core flame. Combustor performance and flame characteristics are influenced by fuel distribution schemes. The location of wall fuel injectors is also optimized to improve combustion efficiency. These results in this paper are valuable for the future optimization of combustion organization in scramjet combustor with multi-stages fuel injection scheme.
摘要译文
在以液体煤油为燃料的平壁超燃式燃烧室中，对支柱/壁组合式燃料喷射方案进行了实验研究。采用薄的支柱作为燃料喷射器和火焰保持器，并且壁式喷射器也位于支柱下游的燃烧室侧壁上。通过在支杆后缘通过喷射器注入纯氧，可在燃烧室中获得稳定的火焰，并通过实验研究了火焰的相互作用特性。在马赫数为2.0的进口处使用不同的支柱/壁式燃料分配方案进行了实验。火焰分为芯火焰和壁火焰两部分，并通过实验研究了两部分之间的相互作用机理。实验结果表明，随着燃料当量比的增加，堆芯火焰增强。核心火焰传播到燃烧器的侧壁以点燃壁燃料，形成壁火焰。壁焰导致支柱下游的热阻，以增强芯焰。燃烧器的性能和火焰特性受燃料分配方案的影响。还优化了壁式燃料喷射器的位置，以提高燃烧效率。本文的这些结果对于未来采用多级燃油喷射方案的超燃冲压燃烧器的燃烧组织的优化是有价值的。
Junlong Zhang [1];Juntao Chang [2];Huimin Tian [1];Ji Li [1];Wen Bao [1]. Flame Interaction Characteristics in Scramjet Combustor Equipped with Strut/Wall Combined Fuel Injectors[J]. Combustion Science and Technology, 2020,192(10): 1863-1886