COMPUTATION OF CAVITY FLOWS WITH SUPPRESSION USING JET BLOWING

A computational investigation of a compressible cavity flow was conduc ted. Blowing was implemented to suppress the large pressure oscillatio ns characteristic of cavity flows, The cavity length-to-depth ratio wa s 4.33, and the freestream Mach number was 1.75. A two-dimensional, ti me-accurate Navier-Stokes scheme was used to simulate the flow. A smal l jet placed within the cavity just below the front lip was used to fo rce the shear layer with different amplitudes and frequencies, This co ntrol technique was successful in reducing the amplitude of the oscill ations. Furthermore, the effectiveness of the control was found to dep end upon the jet frequency, amplitude, phase angle, and duty cycle, Au tocorrelation analysis showed that the jet decreased the size of the s tructures in the shear layer. Cross-correlation analysis showed that t he timing of events within the cavity were unaffected by the jet blowi ng.