The effect of axisymmetric aft ramp cavities in supersonic stream was investigated in a blow down type supersonic flow facility. The facility provides a supersonic flow of Mach 1.3 with a total pressure of 0.3MPa at a total temperature of 300K. Various fillet dimensions were made at the fore wall of the cavity and compared with absence of fore wall fillet cavities. The performance of the cavities was investigated using wall static pressures, static, and stagnation pressure measurements. Aft ramp cavity with fillet shows significant improvement in mixing and less stagnation pressure loss than that of the domain without fillet cavities.
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