異なるせん断層厚さの超音速ジェットにおけるヘリカルモードペアの増幅

抄録

Direct numerical simulations are carried out to investigate the effect of shear layer thickness on jet diffusion and the pressure fluctuations emitted during diffusion by amplifying of helical modes pair in a M=2.0 supersonic jet. In the DNS, a jet is forced by a pair of unstable third helical modes at t=0. The DNS results show that when the start time of jet diffusion is the same, the pressure fluctuation level emitted during jet diffusion is almost the same regardless of the shear layer thickness.