Abstract
The mechanism of intensification for the supersonic round jet mixing by a pulse-periodic energy deposition is studied numerically using the unsteady Reynolds averaged Navier-Stokes equations. A round low-density air jet at different Mach numbers (Mj = 1.05, 1.76, 3.00) is parallelly injected into a coflowing air stream of Mach number M = 2.5, interacting with the oblique shock generated by a compression ramp of 20 degree. The pulse-periodic energy deposition with 50 mJ/pulse at 20 kHz is initiated inside the jet for jet mixing control. The jet mixing enhancement is achieved through the large-scale vortices, initiated by the energy deposition zone interacting with oblique shock. The positive effects with the doubled increased jet cross section area and the strengthened turbulent kinetic energy are achieved, accompanied by a slightly decrease about 0.3% of the total pressure recovery coefficient downstream at the outlet.
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