Abstract
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=5 mm was diagnosed by the current 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≈l000 and a measurement region was set to contain the stagnation region. A measurement volume (-80 x 80 x 80 mm 3) containing 50 velocity planes was scanned in 131.25 ms, which was sufficiently short to capture the instantaneous vortical structures. The iso-vorticity surfaces depict vortical structures in the stagnation region. The budget equation for the mean-square vorticity fluctuations was evaluated.
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