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

An experimental study was conducted on shock wave turbulent boundary l ayer interactions caused by a blunt swept fin-plate configuration at M ach numbers of 5.0, 7.8, 9.9 for a Reynolds number range of (1.0.simil ar to 4.7) x 10(7)/m. Detailed heat transfer and pressure distribution s were measured at fin deflection angles of up to 30 degrees for a swe epback angle of 67.6 degrees. Surface oil flow patterns and liquid cry stal thermograms as well as schlieren pictures of fin shock shape were taken. The study shows that the flow was separated at deflection of 1 0 degrees and secondary separation were detected at deflection of thet a greater than or equal to 20 degrees. The heat transfer and pressure distributions on flat plate showed an extensive plateau region followe d by a distinct dip and local peak close to the fin foot. Measurements of the plateau pressure and heat transfer were in good agreement with existing prediction methods, but pressure and heating peak measuremen ts at M greater than or equal to 6 were significantly lower than predi cted by the simple prediction techniques at lower Mach numbers.