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On the mean structure and unsteadiness of dual shock wave–turbulent boundary layer interactions

Published online by Cambridge University Press:  07 November 2024

Nan Li Open the ORCID record for Nan Li [Opens in a new window] ,
Wenfeng Li ,
Zhengyin Ye  and
Weiwei Zhang Open the ORCID record for Weiwei Zhang [Opens in a new window]
Nan Li*
Affiliation:
School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, PR China International Joint Institute of Artificial Intelligence on Fluid Mechanics, Northwestern Polytechnical University, Xi'an 710072, PR China National Key Laboratory of Aircraft Configuration Design, Xi'an 710072, PR China
Wenfeng Li
Affiliation:
School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, PR China National Key Laboratory of Aircraft Configuration Design, Xi'an 710072, PR China
Zhengyin Ye
Affiliation:
School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, PR China International Joint Institute of Artificial Intelligence on Fluid Mechanics, Northwestern Polytechnical University, Xi'an 710072, PR China National Key Laboratory of Aircraft Configuration Design, Xi'an 710072, PR China
Weiwei Zhang
Affiliation:
School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, PR China International Joint Institute of Artificial Intelligence on Fluid Mechanics, Northwestern Polytechnical University, Xi'an 710072, PR China National Key Laboratory of Aircraft Configuration Design, Xi'an 710072, PR China
*
†Email address for correspondence: linan2019@nwpu.edu.cn
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Abstract

Supersonic internal flows often exhibit multiple reflected shocks within a limited distance. These shocks can interact with each other in a complex manner due to the characteristics of the shock wave–turbulent boundary layer interaction (STBLI), including flow distortion and the relaxing boundary layer. This study aims to characterise this type of interaction and to clarify its fluid physics. A separated STBLI zone was established either upstream or downstream, and another weaker STBLI was established in the opposing position to serve as a perturbation. Time-resolved measurements were employed to characterise the mean separation and unsteadiness as the two regions approached each other, as well as their relationship. The experimental results indicated that the STBLI could affect the separation and reattachment of the other STBLI through either the decelerated or relaxing boundary layer. Despite a small deflection angle, the incident shock can amplify the low-frequency oscillations in the downstream STBLI region. Additionally, the interaction in the downstream region can be influenced by both low- and high-frequency oscillations associated with the upstream STBLI through a relaxing boundary layer. Despite the limited correlation observed between the low-frequency fluctuations in the downstream region and the boundary layer flow not far upstream, there still exists some degree of correlation between the low-frequency shock motions even when they are widely separated. Both the ‘upstream mechanism’ and ‘downstream mechanism’ have been observed, and the significance of low-frequency dynamics in the separated flow, relative to that of the upstream flow, is closely associated with interaction intensity.

JFM classification

Compressible Flows: Supersonic flow Compressible Flows: Shock waves Boundary Layers: Boundary layer separation
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 999 , 25 November 2024 , A3
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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