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为了优化气膜冷却结构,通过数值模拟研究了一种新型气膜孔(由两个圆柱孔组成的双出口孔)的气膜冷却特性.利用Fluent软件对Navier-Stokes方程进行求解,湍流模型采用两方程Realizablek-ε模型和增强壁面函数处理.圆柱孔射流的冷却效率计算结果和实验数据吻合较好.双出口孔射流冷却效率计算结果表明,双出口孔射流有效地增加了冷气的径向覆盖范围,在吹风比为0.5时,次孔射流起到了减弱主孔出口对旋涡的作用;在吹风比为1.0和2.0时,次孔射流使主孔出口处的对旋涡消失.最高冷却效率对应的吹风比为1.0.双出口孔射流在提高冷却效率的同时,其加工难度较扩张形孔明显降低.
In order to optimize the film cooling structure, the film cooling characteristics of a new type of film hole (double outlet hole consisting of two cylindrical holes) were studied by numerical simulation.The Navier-Stokes equation was solved by Fluent software, and the turbulence model was adopted Two equations Realizablek-ε model and enhanced wall function were used to calculate the cooling efficiency of the cylindrical hole jet.The calculated results of the cooling efficiency of the double exit hole jet show that the double outlet jet effectively increases the radial coverage of the cooling air Range, when the blowing ratio is 0.5, the sub-hole jet has played a role in weakening the exit of the main hole to the vortex. When the blowing ratio is 1.0 and 2.0, the sub-hole jet disappears the vortex at the exit of the main hole. Hair blowing ratio of 1.0. Double outlet jet to improve cooling efficiency at the same time, the processing more difficult to expand the hole was significantly reduced.