冲击+逆向对流+气膜冷却传热特性的研究

为了研究火焰筒壁面冲击 逆向对流 气膜复合冷却方式的传热特性,设计了6种不同几何结构的实验件,搭建了实验台,采用红外热像仪对其传热特性进行了研究.结果表明,冷却效率随吹风比的增大而增大;在气膜出口与冲击位置之间,气膜冷却效率沿主流方向不断增加,在相同的冷却壁面处,冷却效率随冲击位置距气膜出口的增加而减小;越过冲击位置,冷却效率随壁面位置的增加而减小.在冷却壁面的任一位置,冷却效果随冲击间距的减小而增大.

Experimental study of the heat transfer characteristics of combined cooling of impingement+reversed convection+film

In order to study the heat transfer characteristics of combined cooling of impingement reversed convection film on a flame tube wall,6 test pieces of different geometry were designed.The heat transfer characteristics of the combined cooling were studied by the experimental method using infrared cameras.The experimental results shows that the cooling effectiveness increases with the increase of blowing ratio;between the impingement position and film exit,the cooling effectiveness increases in the direction of main flow,and at a given position the cooling effectiveness decreases with the increase of distance between impingement position and the film exit;beyond the impingement position,the cooling effectiveness decreases in the direction of main flow.At the same wall position,the cooling effectiveness increases with the decrease of the impingement distance.