摘要
扇形气膜孔是一种先进的气膜冷却结构,其冷却效果相对于常规的圆形气膜孔显著提高。本文在多种流动进口条件下,对扇形气膜孔的冷却效果开展了数值模拟研究,研究中使用的流动进口条件包括:三种吹风比(0.5,1.0,1.5),四种主流道马赫数(0.3,0.45,0.6,0.75)。研究中使用了三种不同的RANS湍流模型(可实现的k-ε,SSTk-ω,标准k-ε)进行了CFD计算分析,以中心线绝热冷却效果为观测对象,对数值模拟和试验结果进行了对比分析。对比试验结果,可实现的k-ε模型相对另外两种模型在计算冷却效果时有较高的温和度,但是另一方面,上述三种湍流模型计算得到的冷却效果相对试验结果都是偏高。
As one of the advanced film cooling scheme, fan-shaped hole exhibits significant improvement in film cooling effectiveness compared with cylindrical holes. In this paper, numerical simulations are applied to predict the cooling effectiveness for fan-shaped hole at various flow conditions. The flow conditions are evaluated at three blowing ratios (0.5, 1, 1.5) and four mainstream Mach numbers (0.3, 0.45, 0.6, 0.75). CFD simulations are performed in three RANS turbulence models namely realizable k-ε model, SST k-ω model and standard k-ε model. Simulation results are compared with experimental data in terms of centerline adiabatic cooling effectiveness, the realizable k-ε model shows a better agreement in predicting the film cooling performance. Although some agreements are obtained, all the three turbulence models tend to overpredict the cooling effectiveness compared to experimental data.
作者
黎旭
屈衍静
宋柳丽
Xu Li;Yan-jing Qu;Liu-li Song
出处
《风机技术》
2019年第3期72-77,I0007,共7页
Chinese Journal of Turbomachinery
