超音速ジェットから放射されるマッハ波に及ぼす流入撹乱成分の影響

抄録

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.