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Vortex evolution and flame propagation driven by oblique shock wave in supersonic reactive mixing layer

机译：超声反应混合层中斜冲击波驱动的涡旋进化和火焰传播

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摘要

Vortex evolution and flame propagation of supersonic reactive mixing layer with the interaction of single/double oblique shock waves are researched by employing direct numerical simulation methods. The vortex dynamics are found to be modulated by oblique shock waves, resulting in mixing enhancement of vorticity values. Notably, wider range of vortex scale distribution induced by double oblique shock waves leads to intense entrainment and nibbling process of large and small scale structures, which can remarkably increase the mixing level of hydrogen and airstreams. The analysis of vorticity transport equation indicates that compressing effects induced by shock waves are responsible for the increase of vortex strength. By tracking the vortex braid dynamical evolution process, it is revealed that local auto ignition induced by double shock waves can accelerate the consumption of hydrogen and finally lead to high efficiency combustion. Since complex background waves are inherently present in confined space of Rocket-based Combined Cycle (RBCC) engine, the newly observed mixing enhancement mechanism for double shocked-reactive mixing layer can provide a guidance for the future design of mixing strategy using the inherent wave structures in RBCC combustor chambers. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：通过采用直接数值模拟方法研究了超声反应混合层的涡旋进化和火焰传播，采用单/双斜冲击波的相互作用研究。发现涡流动力学被倾斜冲击波调节，导致涡旋值的增强。值得注意的是，由双斜冲击波引起的更广泛的涡旋量表分布导致强大和小规模结构的强烈夹带和啃咬过程，这可以显着增加氢气和气流的混合水平。涡流传输方程的分析表明，冲击波诱导的压缩效果负责涡流的增加。通过跟踪涡旋编织动态演进过程，揭示了双冲击波引起的局部自动点火可以加速氢的消耗，最终导致高效燃烧。由于复杂的背景波固有地存在于基于火箭的组合循环（RBCC）发动机的狭窄空间中，因此用于双震动反应混合层的新观察到的混合增强机构可以提供使用固有波结构的混合策略设计的指导在RBCC燃烧室室中。 （c）2021 Elsevier Masson SAS。版权所有。

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