A study on the RR-to-MR transition of shock wave reflections near the leading edge in hypersonic flows

In this paper, the incident shock–separation shock interactions on a surface plate near the leading edge are studied theoretically and experimentally, and the transition from regular reflection (RR) to Mach reflection (MR) is the main focus. The theoretical method employs free interaction theory (FI...

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Bibliographic Details
Published in:Journal of fluid mechanics 2021-06, Vol.919, Article A40
Main Authors: Xue, Longsheng, Wang, Chengpeng, Cheng, Keming
Format: Article
Language:English
Subjects:
Boundary layers
Control equipment
Entropy
Experiments
Flow deflection
Fluid dynamics
Fluid flow
High speed cameras
Hypersonic flow
JFM Papers
Leading edges
Mach reflection
Reflection
Reynolds number
Separation
Shock
Shock waves
Transducers
Wave reflection
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Summary:In this paper, the incident shock–separation shock interactions on a surface plate near the leading edge are studied theoretically and experimentally, and the transition from regular reflection (RR) to Mach reflection (MR) is the main focus. The theoretical method employs free interaction theory (FIT) and the minimum entropy production (MEP) principle to analyse the separation shock strength of flow separated from the boundary layer and separated from the leading edge, respectively, the criterion based on the MEP principle is employed to predict the RR-to-MR transition near the leading edge. The experiments were performed on a rotatable wedge situated over a sharp leading-edge plate such that the wedge could continuously change the flow deflection angle from $0^{\circ }$ to $40^{\circ }$ by means of a high-precision control device. Fast-response transducers and a high-speed camera were used to measure dynamic pressures and to take schlieren images, respectively. The influences of wedge positions, Reynolds numbers and Mach numbers on shock reflections are investigated by careful tests. The theoretical and experimental results for Mach numbers 5, 6, 7 and 8 show good agreement, indicating that the theoretical method is applicable.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2021.421