Influence of pressure drop distribution on the convection heat transfer inside the inclined hole of impingement/effusion cooling

Local and average convection heat transfer coefficients were investigated inside the effusion hole in the impingement/effusion cooling schemes, which have the hole number ratio of 1:1, with different impingement wall and effusion wall pressure drop distribution. The benchmark is the cooling air mass flow rate per unit pressure and area of the high performance aeroengine. The results indicate that the pressure distribution has great influence on the heat transfer enhancement inside the effusion hole entrance (x/d<4). The mechanism of the enhanced heat transfer within the effusion hole entrance was explained using a CFD code. The correlation of the circumferential average heat transfer enhancement coefficients was fitted based on the experimental data, which plays an important role for the future heat transfer optimum of the impingement/effusion double skin wall.