高周波で振動する小さな超音速噴流による超音速振動流れの制御

抄録

A supersonic oscillatory flow is controlled using a small oscillatory jet. The jet is discharged from a small orifice whose diameter is 1.4 mm. The jet oscillation is induced by a cylindrical cavity placed upstream from the orifice. A Mach 1.84 supersonic flow past a rectangular cavity is selected as a test flow and the pressure oscillation is measured using a semiconductor-type pressure transducer placed downstream from the trailing edge of the cavity. All the sharp peaks observed in the pressure oscillation spectrum are weakened adding the oscillatory small jet to the flow although only two peaks are weakened using a non-oscillatory jet.