The influences of element layout and coolant ejection angle on overall cooling effectiveness of laminated cooling configuration

The laminated cooling configuration with integrated impingement, rib-roughed and film cooling can result in high overall cooling effectiveness and is believed to be a promising cooling configuration for the next generation of advanced gas turbines. Typical laminated cooling configuration usually employs discrete film holes which have the similar hole topology along the streamwise and the spanwise direction. Because the functioning distance of film cooling along the streamwise direction is much longer than that along the spanwise direction. So the discrete film cooling cannot perform well in the spanwise direction. A novel laminated cooling layout in which the film outlet spacing in the spanwise direction is much shorter than that in the typical layout was presented in this paper. The angled film holes are also employed to enhance the film cooling effectiveness and to reduce the coolant flow resistance. Conjugate heat transfer computations were performed to assess the overall cooling effectiveness and the coolants resistance. The computational results show that by employing angled film hole on laminated configurations with novel layout, the area-averaged overall cooling effectiveness was considerably improved.