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Numerical investigation of flow structures resulting from the interaction between an oblique detonation wave and an upper expansion corner

Published online by Cambridge University Press:  28 September 2020

Kuanliang Wang ,
Honghui Teng Open the ORCID record for Honghui Teng [Opens in a new window] ,
Pengfei Yang Open the ORCID record for Pengfei Yang [Opens in a new window]  and
Hoi Dick Ng Open the ORCID record for Hoi Dick Ng [Opens in a new window]
Kuanliang Wang
Affiliation:
School of Aerospace Engineering, Beijing Institute of Technology, Beijing100081, PR China
Honghui Teng*
Affiliation:
School of Aerospace Engineering, Beijing Institute of Technology, Beijing100081, PR China
Pengfei Yang
Affiliation:
State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing100190, PR China School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing100049, PR China
Hoi Dick Ng
Affiliation:
Department of Mechanical, Industrial and Aerospace Engineering, Concordia University, Montréal, QCH3G 1M8, Canada
*
†Email address for correspondence: hhteng@bit.edu.cn
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Abstract

Wedge-induced oblique detonation waves (ODWs) have been studied widely, but their interactions with complicated geometries have not been fully addressed. In this study, we investigate ODW interaction with a deflected upper corner due to confinement change upstream of the ODW. Numerical simulations are conducted using the reactive Euler equations with a two-step induction–reaction kinetic model. Two ODWs without the upper wall deflection are first simulated to resolve the basic structures with inflow Mach numbers $M_0 = 6$ and 7. Thereafter, we introduce a deflected upper confinement, resulting in a new wave configuration. This wave is characterized by a post-turning, triangular recirculation zone coupled with a gaseous wedge connecting the deflection point and ODW surface. A parametric study is performed to analyse the effects of the deflection location, deflection angle and activation energy of the heat release reaction. The results reveal that the wave configuration is due to the evolution of ODW decoupling in an expanded supersonic flow. We further study the surface stability and structural unsteadiness arising for $M_0 = 6$. Upstream-travelling transverse waves are observed for the first time, and effects of different parameters on the surface instability are analysed via fast Fourier transforms. Two destabilizing mechanisms of ODW structures are proposed, one from the post-surface thermal choking and the other from the enhanced surface instability.

JFM classification

Compressible Flows: Detonation waves

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Type
JFM Papers
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Journal of Fluid Mechanics , Volume 903 , 25 November 2020 , A28
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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