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• W4361272527 abstract "In this study, the length scaling for the boundary layer separation induced by two incident shock waves is experimentally and analytically investigated. The experiments are performed in a Mach 2.73 flow. A double-wedge shock generator with two deflection angles ( $alpha _1$ and $alpha _2$ ) is employed to generate two incident shock waves. Two deflection angle combinations with an identical total deflection angle are adopted: ( $alpha _1 = 7^circ$ , $alpha _2 = 5^circ$ ) and ( $alpha _1 = 5^circ$ , $alpha _2 = 7^circ$ ). For each deflection angle combination, the flow features of the dual-incident shock wave–turbulent boundary layer interactions (dual-ISWTBLIs) under five shock wave distance conditions are examined via schlieren photography, wall-pressure measurements and surface oil-flow visualisation. The experimental results show that the separation point moves downstream with increasing shock wave distance ( $d$ ). For the dual-ISWTBLIs exhibiting a coupling separation state, the upstream interaction length ( $L_{int}$ ) of the separation region approximately linearly decreases with increasing $d$ , and the decrease rate of $L_{int}$ with $d$ increases with the second deflection angle under the condition of an identical total deflection angle. Based on control volume analysis of mass and momentum conservations, the relation between $L_{int}$ and $d$ is analytically determined to be approximately linear for the dual-ISWTBLIs with a coupling separation region, and the slope of the linear relation obtained analytically agrees well with that obtained experimentally. Furthermore, a prediction method for $L_{int}$ of the dual-ISWTBLIs with a coupling separation region is proposed, and the relative error of the predicted $L_{int}$ in comparison with the experimental result is $sim$ 10 %." @default.
• W4361272527 created "2023-03-31" @default.
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• W4361272527 date "2023-03-30" @default.
• W4361272527 modified "2023-09-25" @default.
• W4361272527 title "Separation length scaling for dual-incident shock wave–turbulent boundary layer interactions with different shock wave distances" @default.
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• W4361272527 doi "https://doi.org/10.1017/jfm.2023.181" @default.
• W4361272527 hasPublicationYear "2023" @default.
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