气膜孔局部堵塞对叶片压力面冲击-扰流柱-气膜结构综合冷却效率的影响

doi:10.7527/S1000-6893.2016.0067

Abstract

Abstract:

An investigation is performed numerically to reveal the effects of partial blockage inside film holes on the overall cooling effectiveness of an integrated impingement-fin-film cooling configuration on the blade pressure side, mainly focusing on the effects of blockage position and blockage ratio. The results show that the overall cooling effectiveness increases gradually with the increase of blowing ratio in both cases of no blockage and partial blockage film holes. With low blowing ratio, the partial blockage located at the trailing edge of film-hole exit decreases weakly the overall cooling effectiveness, whereas the partial blockage located at the other positions, including the leading edge of the film-hole inlet and the leading edge of the film-hole exit, increases the overall cooling effectiveness weakly. With high blowing ratio, the partial blockages located at the leading edge of the film-hole exit and the leading edge of the film-hole inlet could mitigate the kidney vortices due to the mainstream-coolant jet interaction, leading to a weak improvement of the overall cooling effectiveness, whereas the partial blockage located at the trailing edge of the film-hole exit results in reduction of overall cooling effectiveness to some extent. In general, the influence of the blockage ratio on the overall cooling effectiveness is not simple as the cooling effectiveness of the integrated impingement-fin-film configuration depends on multimechanisms of internal heat transfer enhancement and external film coverage.

Key words: turbine blade, integrated cooling configuration, partial blockage, overall cooling effectiveness, numerical simulation

CLC Number:

V231

ZHOU Junhui, ZHANG Jingzhou. Effects of partial blockage inside film holes on overall cooling effectiveness of an integrated impingement-fin-film cooling configuration on blade pressure side[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(9): 2729-2738.

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Effects of partial blockage inside film holes on overall cooling effectiveness of an integrated impingement-fin-film cooling configuration on blade pressure side

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