摘要
基于冷气喷射模型的验证结果,对复合角分别为0°、30°和60°三种条件下的叶片压力面前部单排孔喷射的气膜冷却特性进行了三维环形叶栅数值模拟,详细分析了在不同吹风比条件下的叶片气膜冷却效率特征。分析结果表明:Coolinh/Bleed冷气喷射模型得出的预测结果可靠。复合角使射流孔附近孔间区域冷却效率值升高。低吹风比下,复合角不能改善展向气膜冷却效率分布的均匀性;高吹风比下,复合角使展向气膜冷却效率更加均匀分布,且可减弱冷却射流脱离壁面的程度。但是,复合角不一定能增强冷却孔下游的整体气膜冷却效果。
Based on the validation of bleeding model for film cooling,this paper has simulated the film cooling characteristics of three-dimensional annular cascade with one row of coolant hole on the pressure side,in which the compound angle was chosen for 0 deg,30 deg and 60 deg.The film cooling effectiveness has been analyzed with different blow rates.The results show that compound angles improve film cooling effectiveness between holes and make the spanwise film cooling effectiveness more uniform at larger blow rates.We can get better results with the model of Cooling/Bleed.The cooling flow which is separated from the wall becomes weaker with the existence of compound angle at larger blow rates.However,the compound angles couldn／＇t enhance the cooling efficiency at the downstream location of cooling holes.
出处
《热力透平》
2010年第3期190-194,220,共6页
Thermal Turbine
关键词
气膜冷却
复合角
吹风比
冷却效率
film cooling
compound angle
blow rate
cooling effectiveness
