Abstract
The vortex formation and the turbulence-energy production in a wall-impinging jet were investigated by the instantaneous and time-averaged velocity distributions measured using cross-correlation of high-speed particle images. By comparing the measured results with those in a free jet, the characteristics of flow patterns around the wall were clarified. Based on the ensemble of fluctuating and instantaneous velocities, the production term of the budget equation of turbulence-energy k was directly evaluated. The rate of k-production increases where flow was decelerated due to the normal stress to the wall. In addition, some specific vortex-patterns were sampled, which exemplified an increase in the rate of k-production around the stagnation point.
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