论文部分内容阅读
采用realizable k-ε模型,通过数值模拟分析了各种孔排结构在不同吹风比下对气膜冷却效率的影响.结果表明:边界层等温线反映了上、下游射流孔所产生的射流之间的相互作用;当吹风比M=0.5时,由于射流紧贴壁面,各种孔排结构都有较好的冷却效果,随着吹风比的增大,射流逐渐脱离壁面;当顺排排列时,由于上游射流孔的作用,使得下游射流能很好地贴附壁面,在M=2.0时,冷却效果仍然较好;孔排3在M=0.5时有较高的冷却效率;而对于孔排1,当M=1时,气膜在x/d=2区域以后有很好的保护作用.
The realizable k-ε model was used to analyze the influence of various pore structure on the film cooling efficiency under different blowing ratios by numerical simulation.The results show that the boundary layer isotherms reflect the jet flow between the upstream and downstream jet holes When the blowing ratio M = 0.5, the jet has a good cooling effect due to the close contact of the jet with the wall. As the blowing ratio increases, the jets gradually separate from the wall. When arranged in a row, Due to the effect of the upstream jet hole, the downstream jet can be well attached to the wall surface, and the cooling effect is still good at M = 2.0. Row 3 has a higher cooling efficiency at M = 0.5, while for row 1 , When M = 1, the gas film in the x / d = 2 area after a good protective effect.