0606 ヘリカルモードペアにより励起された超音速円形ジェットの渦構造(OS6-2 噴流,後流およびはく離流れ現象の探求と先端的応用,OS6 噴流,後流およびはく離流れ現象の探求と先端的応用)

Abstract

The three-dimensional time dependent compressible Navier-Stokes equations are numerically solved to study transitional structure in a supersonic round jet at high convective Mach number (M=2.0) using high-order compact upwind schemes. The numerical results indicate that the growth of a pair of helical modes play a significant role for transitional structure and expansion of jet shear layer in a round jet. The growth of a pair of helical modes is responsible for discriminative transitional structure in the downstream of the jet, which yields various decay pattern of the jet centerline velocity.