不同横斜槽结构对气膜冷却效果影响的正交模拟

Orthogonal Simulation of Effects of Different Transverse

关键词:  气膜冷却  正交模拟  吹风比  冷却效率  横斜槽

Key words:  Film cooling  Orthogonal simulation  Blowing ratio  Cooling effectiveness  Transverse declining slot

摘要:

通过FLUENT软件并采用Realizable k-ε紊流模型对三维定常不可压缩N-S方程进行求解，利用正交模拟的方法模拟了不同的槽宽、吹风比和槽深三个影响因素共同作用下的平板气膜冷却效果，最终选出最优的冷却方案。结果表明:开槽深度为1倍孔径，吹风比为2.0和开槽宽度为2倍孔径的开槽姊妹孔的冷却效果最佳，为最优冷却方案。槽宽对平板冷却效率的影响最大，槽深的影响较小，吹风比的影响最小；开槽深度为0.75倍孔径，吹风比为2.0和开槽宽度为4倍孔径的开槽姊妹孔的冷却效率最低为0.1974，比最优冷却方案低约173%；横斜槽的存在使反向漩涡对的强度受到了抑制，从而加强了冷却效果。

Abstract:

The three-dimensional steady incompressible Navier-Stokes equation was solved with Realizable k-ε turbulence model by FLUENT. Cooling effectiveness was analyzed with orthogonal simulation techniques on the effects of the width of groove，blowing ratio and the depth of groove under the combined action. Finally，the best effect of cooling case was chosen. The results show that cooling effect of groove sister hole with depth being one time hole diameter，blowing ratio being 2.0 and groove sister hole with width being two times hole diameter was the best. It was the best cooling case. The effect of the width of groove on cooling efficiency is the biggest and the effect of blowing ratio is much smaller than the depth of groove. The lowest cooling effectiveness of groove sister hole with depth being 0.75 time hole diameter，blowing ratio being 2.0 and groove sister hole with width being four times hole diameter was 0.1974. It is 173% lower than that of the best cooling case. The counter rotating vortex pairs have been weakened for the transverse declining slot and the cooling effect was enhanced.