气膜-发散冷却结构冷却效果的实验研究

为了研究气膜-发散组合冷却结构的冷却特征,设计了5种组合冷却结构形式,采用实验的方法对气动参数和几何参数对冷却效率的影响规律开展了研究,结果表明:(1)由于气膜的存在使得发散冷却的起始段冷却效率有很大的提高,极大提高了发散冷却结构的整体冷却效率;(2)随着发散孔纵向间距的增大,发散段整体冷却效率逐渐降低,但对发散冷却起始段的影响不大;(3)发散孔复合角对冷却效率对冷却效率的影响随吹风比的变化而变化,在小吹风比时,45°复合角的冷却效率最高;在吹风比较大时,在发散冷却段的中后部,0°复合角的冷却效率最高。

Experimental Investigation on Cooling Effectiveness of Film-Effusion Cooling

In order to study the cooling characteristics of film-effusion combination cooling structure, three kinds of test pieces are designed. Their cooling effectiveness is investigated by experimental method with infrared cameras. The experimental result shows that: (1)the cooling film from the film slot improves cooling effect in the beginning region of the effusion cooling, which largely increases the integrated film-effusion cooling effectiveness, (2)the cooling effectiveness is gradually decreased with the increase of the effusion hole space, (3)the effusion hole angle has a large effect on the cooling effectiveness, and the cooling effectiveness is the highest when the effusion hole angle is 45°. But, at a higher blowing ratio, the cooling effectiveness reaches the highest in the mid and tail of the effusion cooling region with the effusion hole angle of 0°.