Abstract
The three-dimensional compressible Navier-Stokes equations are numerically solved to study suppress Mach wave emission in a supersonic round jet at high Mach number using high-order compact upwind schemes. Two cases of inlet disturbance for Mach number Mj=2.0 are presented. The first case is the jet flow forced randomly. The second case is the jet forced by random disturbances and a pair of unstable 3rd helical modes (m=±3) with a subsonic phase speed. The numerical results show that the jet potential core region is reduced in the jet forced by a pair of 3rd helical modes. Therefore, the intense Mach wave radiation observed in the randomly forced jet can be reduced by forcing with a pair of 3rd helical modes.
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