Effect of the Backward Facing Step on a Transverse Jet in Supersonic Crossflow

Jincheng Zhang, Zhenguo Wang, Mingbo Sun, Hongbo Wang, Chaoyang Liu and Jiangfei Yu
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Jincheng Zhang: Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China
Zhenguo Wang: Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China
Mingbo Sun: Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China
Hongbo Wang: Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China
Chaoyang Liu: Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China
Jiangfei Yu: Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China

Energies, 2020, vol. 13, issue 16, 1-19

Abstract: A transverse jet in the supersonic crossflow is one of the most promising injection schemes in scramjet, where the control or enhancement of jet mixing is a critical issue. In this paper, the effect of the backward facing step on the characteristics of jet mixing was investigated by three-dimensional large eddy simulation (LES). The simulation in the flat plate configuration (step height of 0) was performed as the baseline case to verify the computation framework. The distribution of the velocity and pressure obtained by the LES agreed well with the experiment, which shows the reliability of the LES code. Then, two steps with a height of 1.0D and 1.58D (D is the injector diameter) were numerically compared to the non-step baseline case. The comparison of the three cases illustrates the effect of the large-scale recirculation region on the variable distribution, and shock and vortex structures in the flow field. In the windward region, the shear layers become thicker, and the convection velocity of the shear vortexes reduces. In the leeward region, the wake vortices almost disappear while the counterrotating vortex pairs (CVPs) expand in the spanwise direction. In the area upstream of the jet, the separation bubble works with the upstream large-scale recirculation zone to entrain the jet into the upstream near-wall zone. At last, a comparison of the overall mixing performance of the three cases revealed that the penetration depth and mixing efficiency increased with the step height increasing.

Keywords: scramjet; LES; transverse jet; backward facing step; mixing enhancement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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