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Reflection of a converging shock over a double curved wedge

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Abstract

The reflection of a converging cylindrical shock over a double curved wedge was investigated experimentally and numerically. The double curved wedge was specially designed to ensure that the wedge angle only changes at the corner during the cylindrical shock reflection. Seven different reflection processes existing in the planar case were reproduced in the converging case. The sudden variation of the wedge angle alters the strength of the disturbance propagating along the converging shock. Depending upon the type of the flow-induced pressure waves, which dominate the type of the wave behind the reflection over the second wedge, the propagation of the disturbance is either promoted or restrained. Comparison of the lengths of the disturbed shock front between the single wedge reflection and the double wedge reflection indicates that the history of the reflection over the first wedge would affect the reflection over the second wedge. Provided that the Mach reflection over the second wedge is fully developed, it approaches the Mach reflection of an identical shock over a single wedge with the same wedge angle as the second wedge. Relative to the planar case, the convex curved surface in the converging case promotes the disturbance propagation and increases the trajectory angle of the triple point.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 12022201, 11772329, 91952205, and 11625211).

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  1. Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230026, China

    H. Wang, Z. Zhai & X. Luo

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  1. H. Wang
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Correspondence to Z. Zhai.

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Communicated by O. Igra.

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Wang, H., Zhai, Z. & Luo, X. Reflection of a converging shock over a double curved wedge. Shock Waves 31, 439–455 (2021). https://doi.org/10.1007/s00193-021-01027-5

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