AM06-12-013 縦渦が導入された超音速乱流混合場のPIV計測(乱流現象の制御・流れの抵抗低減(3),一般講演)

概要

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For supersonic mixing enhancement, experiments suggest that large scale streamwise vortices seems to be the most advantageous, for example, FFT spectrum analysis of mass flux fluctuations show that the power spectrum partly follows Kolmogorov's -5/3 power law, indicating that the breakdown of streamwise vortices occur to generate small scale turbulent eddies of high mixing power. This experimental study examines the breakdown process of streamwise vortices by using PIV, schlieren visualization and hot-wire anemometer. The results show that the breakdown into small scale turbulence occurs at the vortex Reynolds number Re_Γ=Γ/ν=1.3×10^4 or more. Also, we obtain useful knowledge on the breakdown process of streamwise vortices which is surely important for supersonic mixing enhancement.
2006-09-05