出流孔复合角对发散孔板冷却效率的影响研究  

Research on Cooling Characteristics of Effusion Wall with Compound Angle

作　　者：谭晓茗[1] 赵乃芬 房人麟 徐华胜 张靖周[1] 

机构地区：[1]南京航空航天大学能源与动力学院,江苏省航空动力系统重点实验室,江苏南京210016 [2]中航工业燃气涡轮研究院,四川成都610005

出　　处：《推进技术》2016年第6期1092-1097,共6页Journal of Propulsion Technology

基　　金：江苏省航空动力系统重点实验室开放课题(NJ20130026);中央高校基本科研业务费专项资金赞助(NS2014018)

摘　　要：以提高发散孔板冷却效率为目标,借助于红外热像仪开展了发散冷却效率实验研究,分析了孔偏转角、孔倾斜角、吹风比等因素对发散孔板冷却效率的影响。研究结果表明:发散孔倾斜角度较小时,偏转角对冷却效率的分布无明显影响;随着倾斜角增大,偏转角减小,气膜层覆盖更均匀,冷却效果变好;倾斜角为0°时,随着偏转角减小,冷却效果反而变差;随着吹风比的增加,发散孔板冷却效率增大,当吹风比达到1.8左右时,绝热冷却效率最高。小吹风比时,偏转角对冷却效果的影响比较微弱,吹风比比较大时,偏转角对冷却效果的影响才比较显著;不论偏转角多大,倾斜角为30°时的冷却效果最佳。Experimental study was performed by infrared camera on the cooling characteristics of effusion wall with compound angle. The effects of film outflow with different deflection angle, slant angle, blowing ratio on the film cooling effectiveness were revealed. The results show that deflection angel has little effect on the film cooling effectiveness of effusion wall when the slant angle is small. With increasing of slant angle and decreasing of deflection flow, the film outflow has better cooling effect and full coverage. As the slant angle is 0°, the cooling effectiveness is getting worse with decreasing of deflection angle. The cooling effectiveness increases with the blowing ratio and reaches to the maximum when blowing ratio is 1.8. The film deflection angle has weak effect on the film cooling effectiveness as the blowing ratio is small. The film deflection angle has greater effect on the film cooling effectiveness while the blowing ratio getting larger. The cooling effect is the best with fihn slant angle of 30° which can not be affected by deflection angle.

关 键 词：发散冷却 复合角 冷却效率 吹风比 实验研究 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]