加振伝熱面上の二次元衝突噴流に関する数値解析(熱工学,内燃機関,動力など)

Numerical analyses were performed for the oscillation effect of impingement surface on the impingement heat transfer and flow with a confined wall. Two-dimensional governing equations were solved for the Reynolds number Re=200 and 500, Prandtl number Pr=0.71, the dimensionless space between nozzle and impingement surface H=1.0 and the Strouhal number Sf=0∼1.0, as a moving boundary problem. Oscillation induces the enhancement and depression of the local heat transfer. The local heat transfer was improved at comparatively low frequency due to the flow fluctuation. On the other hand, at high frequency it was depressed due to the flow for upper direction near the impingement surface. The oscillation effect spatially appeared at the downflow side after impingement.