壁面衝突噴流における渦形成と乱れエネルギー生成のPIV計測(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
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.
社団法人日本機械学会の論文
2002-03-25