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Control of the oscillations of shock train using boundary layer suction

机译：使用边界层抽吸控制冲击火车振荡的控制

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摘要

The isolator plays a major role in the scramjet engine by providing suitable pressure for the combustion process. It is situated between the inlet and the combustion chamber. The deceleration of supersonic flow into subsonic flow is achieved by a series of bifurcated normal shock waves referred to as "shock train". The flow field is more complex with shock-shock interaction and shock boundary layer interaction. The presence of such flow inside the isolator can degrade the performance of the scramjet engine. The present study focuses on the self-excited shock train flow in an isolator and its control by partial removal of the boundary layer. The results examine the variation of the inlet to outlet pressure ratio with and without suction flow control. Numerical results indicate that the boundary layer suction will cause downstream movement of the shock train and the length of the shock train is reduced. The transformation of the shock train into a single curved normal shock is observed when the shock train present closer or upstream of the suction slot region. The obtained result shows the self-excited oscillation frequency in the range of 14-15 Hz. The suction control provides an advantage by 50% reduction in the amplitude of the shock train movement. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：隔离器通过为燃烧过程提供合适的压力，在Scramjet发动机中起主要作用。它位于入口和燃烧室之间。通过称为“冲击列车”的一系列分叉的正常冲击波实现超音速流入亚音流的减速。流场与冲击冲击相互作用和冲击边界层相互作用更复杂。隔离器内部的这种流动的存在可以降低扰刀发动机的性能。本研究专注于隔离器中的自我激发冲击火车，通过部分去除边界层。结果检查入口与出口压力比的变化，不具有吸入流量控制。数值结果表明边界层抽吸将导致冲击火车的下游运动，减小冲击火车的长度。当震动火车较近或上游的吸入槽区域时，观察到冲击火车进入单个弯曲正常冲击的变换。所获得的结果显示了14-15Hz范围内的自激的振荡频率。抽吸控制提供了震动火车运动幅度的50％的优点。 （c）2021 Elsevier Masson SAS。版权所有。

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