1555 強度と寸法が変化する縦渦対を用いた壁面噴流の操縦(G05-6 噴流(1),G05 流体工学)

概要

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An experimental study was made on the flow management for the stronger wall jet by introducing a streamwise vortex pair with temporal variation in strength and radius. Mean velocity, turbulent intensities and Reynolds shear stress were measured with hot-wire anemometers and momentum flux integrated in cross-stream sections was calculated and compared to that of the original non-disturbed flow. Increasing rate of momentum flux due to the temporal variation in vortex strength and radius is greater than that in the case with steady streamwise vortex pair. Instantaneous velocities were decomposed into three components such as mean, periodic and random and production terms for Reynolds shear stress component were obtained from experimental data. The periodic velocity component has considerable contribution for Reynolds shear stress production in the case with temporal variation in strength and radius of the streamwise vortex.
社団法人日本機械学会の論文
2007-09-07