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

关键词:  发散冷却  复合角  冷却效率  吹风比  实验研究

Key words:  Effusion cooling  Compound angle  Cooling effectiveness  Blowing ratio  Experimental study

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。

Abstract:

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 film slant angle of 30° which can not be affected by deflection angle.