摘要
采用Fluent软件和k-ε湍流模型,在主流雷诺数为9 600,吹风比分别为0.5,1.0,1.5和2.0,横流速度比分别为0.3,0.5和0.7条件下,对横流冷气气膜的冷却效率、流场和温度场进行三维数值模拟。结果表明:吹风比为1.0时,横流速度比对2个出口流量分配影响最明显;低吹风比(0.5)时,横流速度比对径向平均冷却效率和面平均冷却效率影响均非常小;中等吹风比(1.0)时,横流速度比增加使冷却效率减小;高吹风比(2.0)时,横流速度比对径向平均冷却效率分布影响比较复杂,对面平均冷却效率影响较小。
The Fluent software was applied to carry out three dimensional simulation on film cooling efficiency of the coolant corssflow and flow and temperature field distributions of the injection hole,under conditions with the mainstream Reynolds number of 9600,the blowing ratio of 0.5,1.0and 2.0,and the crossflow velocity ratio of 0.3,0.5and 0.7.The results show that,with the blowing ratio of 1.0,the cross-flow velocity ratio affected the mass flow rate distribution at the two outlets the most.When the low blowing ratio is low（of 0.5）,the cross-flow ratios had weak influence on the film cooling effectiveness.At the moderate blowing ratio of 1.0,the film cooling effectiveness decreased when the cross-flow ratios increased.At the high blowing ratio of 2.0,the cross-flow ratios had complex influence on the laterally averaged film cooling effectiveness and weak influence on the surface averaged film cooling effectiveness.
出处
《热力发电》
CAS
北大核心
2016年第3期64-69,共6页
Thermal Power Generation
基金
国家自然科学基金资助项目(51406124)
关键词
涡轮叶片
气膜冷却
双出口孔
冷却效率
横流
数值模拟
turbine blade
film cooling
double-outlet hole
cooling efficiency
cross-flow
numerical simulation
