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Mach reflection of three-dimensional curved shock waves on V-shaped blunt leading edges

Published online by Cambridge University Press:  22 November 2023

Tao Zhang Open the ORCID record for Tao Zhang [Opens in a new window] ,
Jianrui Cheng Open the ORCID record for Jianrui Cheng [Opens in a new window] ,
Chongguang Shi Open the ORCID record for Chongguang Shi [Opens in a new window] ,
Chengxiang Zhu Open the ORCID record for Chengxiang Zhu [Opens in a new window]  and
Yancheng You Open the ORCID record for Yancheng You [Opens in a new window]
Tao Zhang
Affiliation:
School of Aerospace Engineering, Xiamen University, Xiamen, Fujian 361005, PR China
Jianrui Cheng
Affiliation:
School of Aerospace Engineering, Xiamen University, Xiamen, Fujian 361005, PR China
Chongguang Shi*
Affiliation:
School of Aerospace Engineering, Xiamen University, Xiamen, Fujian 361005, PR China
Chengxiang Zhu*
Affiliation:
School of Aerospace Engineering, Xiamen University, Xiamen, Fujian 361005, PR China
Yancheng You
Affiliation:
School of Aerospace Engineering, Xiamen University, Xiamen, Fujian 361005, PR China
*
†Email addresses for correspondence: chongguangshi@xmu.edu.cn, chengxiang.zhu@xmu.edu.cn
†Email addresses for correspondence: chongguangshi@xmu.edu.cn, chengxiang.zhu@xmu.edu.cn
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Abstract

Theoretical investigation of the primary Mach reflection (MR) configuration on V-shaped blunt leading edges (VBLEs) forms the focus of this study. By ignoring the secondary interactions, a theoretical method based on a simplified form of the continuity relation is developed to predict the shock configurations, including the detached shock, the Mach stem, the transmitted shock and the triple point. The comparison of the theoretical results with both numerical and previous experimental results shows the reliability of the theoretical approach in predicting shock structures across a wide range of free stream and geometric parameters. The theoretical model provides a detailed comprehension of the occurrence mechanism of inverse MRs on VBLEs and the influence of the free stream and geometric parameters on primary MR configurations. Along with the primary MR configuration, the curved shock or compression waves generated by the crotch are solved and offer insight into the transition from the MR to the regular reflection from the same family (sRR). The increase of the ratio $R/r$ and the free stream Mach number $M_0$ appears to facilitate the transition, while the effect of the half-span angle $\beta$ is non-monotonic. The predicted shock positions allow for the identification of the transition boundary between the primary MR and sRR. It is found that $R/r$ below a threshold (for a set $M_0$ value) produces MR, irrespective of $\beta$. If this threshold is exceeded, the configuration can transition from the primary MR to sRR and then back to the primary MR as $\beta$ increases.

JFM classification

Aerodynamics: Flow-structure interactions Compressible Flows: Shock waves
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 975 , 25 November 2023 , A45
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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