Passive Enhancement of Pressure Oscillation in Cavity-Induced Supersonic Mixing

摘要

The present work reports of the numerical investigation on the passive technique used to enhance the supersonic cavity-induced pressure oscillations. The unsteady flows over a shallow cavity at Mach 1.73 were modified at the leading edge by changing the leading edge geometry. 3 (three) leading edge geometries namely circular-contoured, slanted and circular contour on 30° slant edge were used to intensify the excitation of the shear layer. The density-based algorithm in ANSYS Fluent 13.0 was used to solve the time-dependent Navier-Stokes equations. The SST k-ω model was used to model the turbulence within an unstructured mesh solver. The numerical code was validated comparing the numerical results with the experimental data. The pressure fluctuations with time at different locations in and after the cavity were analyzed. The modification of cavity leading edge shown influencing on the pressure fluctuations.