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.

Conclusions

The cooling characteristics of laminated configuration with a novel cooling layout and angled film holes were studied by using conjugate heat transfer method. The results for the Baseline Case and the four cases with novel element layout have been presented and compared. The main conclusions are as following:

1. A novel element layout of laminated cooling is proposed. Compared with the Baseline Case, the streamwise spacing of film outflow is enlarged and the spanwise spacing of film outflow is decreased. The area-averaged cooling effectiveness of the Case 1 with the novel layout is larger than that of Baseline Case with typical layout when BR < 1.3.

2. The film cooling effectiveness has a strong impact on the overall cooling effectiveness of the laminated cooling. The configurations with spanwise inclined film holes or both streamwise and spanwise inclined film holes lead to obvious increases of overall cooling effectiveness. At the same time, the coolant flow resistance are also be decreased.

The results have been published on International Journal of Heat and Mass Transfer 101 (2016) 988–991.