Effect of inflow disturbance components on Mach waves radiated from a supersonic jet

Abstract

The three-dimensional compressible Navier-Stokes equations are numerically solved to study effect of the velocity components of inflow disturbance on suppression of Mach waves radiated from a supersonic round jet at high convective Mach number. Inflow disturbances of only u_r or u_θ or u_x velocity components are compared. The numerical results show that inflow disturbance of only the u_θ component and u_r component than the case of only the u_x component is easily accepted into the jet as the third helical mode. In addition, the jet is efficiently diffused by inflow disturbances of only u_θ or u_r component with small energy, and the radiated Mach wave is suppressed.