Abstract
The coherent structure for the plane wall jet under the self-preserving pressure gradient was analyzed to examine the effect of velocity ratio Um/Ue on the ensemble averaged pattern which, in particular, corresponds to the trunk of a pair of spanwise vortices. Three values of velocity ratio Um/Ue were used in the range of 2.0 to 4.0. The VITA technique was employed to detect the longitudinal velocity signals. It was inferred from the ensemble averaged patterns of u- and ν- fluctuating velocities that a pair of counter-rotating spanwise vortices has the same event independent of the velocity ratio. The peak ratio Rp in the ensemble-averaged pattern, however, decreases with decreasing velocity ratio. The mean period of the event also decreases with decreasing velocity ratio, while the mean frequency of the event increases. From these results, it was found that the spatial scale of a pair of vortex structures decreases with decreasing velocity ratio.
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