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Shock-Wave/Boundary-Layer Interactions at Compression Ramps Studied by High-Speed Schlieren

Sun, Z. ORCID: 0000-0002-3862-7939, Gan, T. & Wu, Y. (2020). Shock-Wave/Boundary-Layer Interactions at Compression Ramps Studied by High-Speed Schlieren. AIAA Journal, 58(4), doi: 10.2514/1.j058257


The shock wave boundary layer interactions (SWBLIs) at compression ramps (ramp angle α=20o -30o ) are studied at Ma=2.0 and under two Reynolds numbers (Re1=18,600 and Re2=35,600, Re based on boundary layer thickness). High-speed schlieren operating at 20 kHz is used as the flow diagnostics. The flow structures in the compression ramp SWBLIs, including the shock wave, interaction region and induced turbulent region over the ramp surface, are discussed. Their variation under increasing ramp angle and Reynolds number are further examined. The low-frequency shock wave oscillations are also studied through tracking the shock wave motion. A larger ramp angle increases the spectral intensity of the shock wave’s low-frequency unsteadiness, while increasing the Reynolds number results in a lower peak frequency for the separation and reattachment shock waves.

Publication Type: Article
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments: School of Science & Technology > Engineering
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