1403 超音速ジェットの遷移における流入攪乱スケールの影響(OS12-1 噴流・後流・剥離流の解明とその利用)

抄録

The three-dimensional compressible Navier-Stokes equations are numerically solved to study the transitional structure and the resultant acoustic emission in a supersonic round jet at high convective Mach numbers. Numerical results for the convective Mach number M_c = 1.00 (M_j=2.0) and Re_<r0>=2000 based on the jet nozzle radius r_0 are presented. Four different cases were investigated. These cases are the jet flow forced by random disturbances with various dominant wave length λ_<max>. These results suggest that the random inlet disturbance with short wave length affects transition largely compared with long wavelength. However, in the case where the potential core length is the same, the effect of dominant wave length of inlet random disturbance on transition structures and sound fields is small in the super sonic round jet.