【摘要】 本文对应用于超燃发动机内流道中的氢与碳氢燃料气膜冷却的边界层燃烧现象进行大涡模拟。研究表明碳氢燃料气膜的边界层燃烧主要由较厚的扩散火焰构成，化学反应释热区位于混合层外侧远离壁面的位置，且在释热区和壁面之间存在着吸热裂解反应区，强度与释热反应强度相当。由于边界层底部较慢的吸热裂解反应存在，一部分氧气可以与碳氢燃料气膜进行具有预混性质的裂解反应，使得碳氢燃料气膜在裂解反应路径中表现出很强的非平衡特征。而氢燃料气膜的边界层燃烧反应速率极快，反应近乎处于“混即燃”的平衡状态，火焰锋面由薄的扩散火焰构成，火焰锋面位置更为靠近壁面，且平行于壁面发展。更多还原

【Abstract】 The phenomenon of boundary layer combustion, occurring in the application of a hydrogen and hydrocarbon fuel film in the internal passage of a scramjet engine, is numerically investigated using large eddy simulation. It is shown that the boundary layer combustion of hydrocarbon film mainly consists of thick diffusion flames. The heat release region locates at the outer edge of the mixing layer far away from the wall, and there exists endothermic pyrolysis reactions between the heat release region and the wall with the energy effects comparable to the heat release reactions. Because the endothermic pyrolysis reactions are much slower, a certain amount of oxygen can mix with the hydrocarbon film without immediate consumption, leading to a premixing reaction mode. This makes the pyrolysis reactions in the hydrocarbon film exhibit strong non-equilibrium characteristics.On the other hand, the chemical kinetics of the hydrogen film are very fast, resulting in a boundary layer combustion that approaches an equilibrium state. The flame front developed in parallel is thin and locates near the cooling wall.更多还原