Abstract Initiation and stabilization of oblique detonation waves (ODWs) are important to the successful application of oblique detonation engines (ODEs), which, however, have been rarely studied under realistic combustor conditions. In this study, the flow structures, stabilization characteristics and potential thrust performance (under different combustor's geometries with different ODW reflection locations) in a typical hydrogen-fueled ODE combustor are numerically studied by solving the two-dimensional multi-species Reynolds-averaged conservation equations with a detailed hydrogen combustion mechanism. Results suggest that all the detonation waves/shock waves can be stabilized in the space-confined combustor, and the boundary layer separation induced by the ODW-boundary layer interaction is found crucial to determining the types of combustion mode in the combustor. Except for the expected ODW-induced combustion, fast combustion induced by a stabilized overdriven normal detonation wave (NDW) may exist in the combustor simultaneously (even up to a large extent, >73.7%). It is demonstrated that the stabilization of the overdriven NDW in the combustor can be attributed to the formation of an effective aerodynamic convergent-divergent nozzle that quickly accelerates the subsonic flow behind the NDW to supersonic, preventing downstream disturbances from propagating upstream. Benefiting from the chemical equilibrium shift caused by the expansion effect of the flow, more heat is released to compensate for the compression loss and the simulated thrust performance is shown not deteriorate significantly even with a large percentage of NDW-induced combustion existing in the ODE combustor. This work would be beneficial to the future developments of the ODEs.

中文翻译：

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燃烧室中稳定斜爆震波的形成

摘要 斜爆震波 (ODW) 的启动和稳定对于斜爆震发动机 (ODE) 的成功应用很重要，但在实际燃烧室条件下很少对其进行研究。本研究通过求解二维多物种雷诺平均守恒方程，数值研究了典型氢燃料 ODE 燃烧器的流动结构、稳定特性和潜在推力性能（在不同燃烧器几何形状和不同 ODW 反射位置下）具有详细的氢气燃烧机理。结果表明，所有的爆轰波/冲击波都可以在空间受限的燃烧室中稳定下来，ODW-边界层相互作用引起的边界层分离对于确定燃烧器中的燃烧模式类型至关重要。除了预期的ODW引起的燃烧外，由稳定的超驱动法向爆轰波（NDW）引起的快速燃烧可能同时存在于燃烧器中（甚至达到很大程度，> 73.7％）。结果表明，燃烧器中超速驱动 NDW 的稳定可归因于形成有效的气动收敛-发散喷嘴，该喷嘴将 NDW 后面的亚音速流快速加速为超音速，防止下游扰动向上游传播。受益于流动的膨胀效应引起的化学平衡位移，释放更多的热量以补偿压缩损失，即使 ODE 燃烧器中存在很大比例的 NDW 引起的燃烧，模拟的推力性能也不会显着恶化。这项工作将有利于 ODE 的未来发展。