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.