The mixing process in the supersonic flow is very important for the engineering implementation of the scramjet engine, and many novel mixing augmentation schemes have been proposed and investigated in the past few years. In this paper, the combination between the oblique shock wave and a novel step has been proposed to promote the mixing process between the supersonic airflow and the fuel, and the oblique shock wave has been induced by a ramp located on the upper wall of the channel. The impacts of the jet location and the jet pressure ratio have been both evaluated in order to explore their influences on the mixing enhancement mechanism. The obtained results show that the oblique shock wave is beneficial to prolong the residence time of the hydrogen in the supersonic flow, and the hydrogen distribution moves upstream with the oblique shock wave. At the same time, when the jet pressure ratio is large enough, the recirculation zone formed downstream of the step would increase, and this is beneficial for the mixing process between the fuel and the air as well. This may imply that the proposed combination scheme is a good candidate for the fuel mixing augmentation strategy, and its physical mechanism should be explored much deeper in the future, especially for its three-dimensional effect.

超声速流动中的混合过程对于超燃冲压发动机的工程实施非常重要，并且在过去几年中已经提出并研究了许多新颖的混合增强方案。为了提高超声速气流与燃料的混合过程，提出了斜向冲击波与新颖步骤相结合的方法，斜向冲击波是由通道上壁的斜面引起的。 。为了评估它们对混合增强机理的影响，已经评估了喷射位置和喷射压力比的影响。所得结果表明，斜激波有利于延长氢在超音速流中的停留时间，并且氢的分布随斜激波向上游移动。同时，当射流压力比足够大时，在步骤下游形成的再循环区域将增加，这也有利于燃料和空气之间的混合过程。这可能意味着所提出的组合方案是燃料混合增强策略的良好候选者，并且其物理机制在未来应进一步深入研究，尤其是其三维效果。