HEATING CHARACTERISTICS OF BLUNT SWEPT FIN-INDUCED SHOCK WAVE TURBULENT BOUNDARY LAYER INTERACTION

An experimental study was conducted on shock wave turbulentboundary layer interactions caused by a blunt swept fin-plate configuration at Machnumbers of 5.0, 7.8, 9.9 for a Reynolds number range of (1.0.～4.7)×10~7/m. Detailedheat transfer and pressure distributions were measured at fin deflection angles of upto 30° for a sweepback angle of 67.6°. Surface oil flow patterns and liquid crystalthermograms as well as schlieren pictures of fin shock shape were taken. The studyshows that the flow was separated at deflection of 10° and secondary separation weredetected at deflection of θ≥20°. The heat transfer and pressure distributions onflat plate showed an extensive plateau region followed by a distinct dip and localpeak close to the fin foot. Measurements of the plateau pressure and heat transferwere in good agreement with existing prediction methods, but pressure and heatingpeak measurements at M≥6 were significantly lower than predicted by the simpleprediction techniques at lower Mach numbers.