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Large Eddy Simulations of Control of Cavity Shear Layers Using Low-Frequency Pulsed Blowing
Figure 1 shows a time series of the vorticity contours from a Large Eddy Simulation of a Mach 1.5 flow over a cavity. Figures 2 and 3 show the flow field with a pulsed jet just upstream of the leading edge of the cavity. Figure 2 the jet is pulsed at 100 Hz, a frequency that has no relation to any of the natural modes of the baseline case. Figure 3 shows the jet is pulsed at 300 Hz which is very close to the most dominant natural Rossiter mode of the cavity. Analysis of the pressure signal on the floor and real wall of the cavity were used to show that pulsing at the natural mode of the cavity enabled the suppression of the dominant mode in the cavity resulting in a decrease in overall dynamic load on the floor and aft wall of the cavity. However, mode shifting was observed and the pressure signals in the controlled cases were seen to contain modes not present in the baseline case. |
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