AM05-12-013 軸対称衝突噴流の三次元渦構造(乱流渦構造3,一般講演)

概要

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A scanning stereo particle image velocimetry system was applied to measure the three-dimensional distribution of three-component velocity in a round impinging jet. A water jet formed by a round nozzle with an exit diameter of D=5mm was diagnosed by the technique. The jet impinges vertically on the flat plate that was located at 45D from the nozzle. The jet Reynolds number was set at Re_D=1000 and a measurement region was set to contain the stagnation region. The iso-vorticity surfaces depict frequent passage of hairpin-type vortices in the shear layer of the free jet region, convecting toward and away from the stagnation region. The equation for the mean-square vorticity fluctuations was evaluated, and it was found that the vortex stretching by the turbulent strain was the major source of the production of the mean-square vorticity.
2005-09-05