Experimental investigations of a double‐decker jet impingement/film structure's cooling effectiveness

Abstract

Experiments were carried out to investigate the cooling coefficient of a laminar double-decker jet impingement/film structure. Blowing rate M, the ratio of the jet impingement distance to the diameter of the jet hole H/D, the ratio of the distance between the jet hole and film hole to the diameter of the jet hole P/D were changed to study the rules of local cooling coefficient varying with these parameters. All the results show that a higher cooling coefficient was achieved under larger blowing rate conditions. There exists a proper range of H/D and P/D, which can result in a maximum cooling coefficient. It is verified that when H/D = 0.5 and P/D = 4, the maximum cooling coefficient can be achieved.