The effects of film hole location on squealer tip leakage flow field

film-cooling effectiveness and surface heat transfer coefficient were studied by solving the Reynolds averaged Navier-Stokes equations using standard two equation k-ε model. Three film hole location configurations: camber line film holes

suction side film holes

leading edge film holes were simulated. The effects of tip clearance height (t) and blowing ratio (M) were also considered. The results showed that the film hole location affected the film-cooling effectiveness of squealer tip greatly under the same cooling flow rate. The camber line film cooling squealer tip had better film coverage on the region between the camber line and the pressure side squealer. The suction side film cooling squealer tip had better film coverage on the given middle chord region between the suction side squealer and the camber line

as well as on the trailing edge region. The leading edge film cooling squealer tip had better film coverage on all the tip surface. The tip clearance height had different effects on different squealer tips. The tip film-cooling effectiveness of the leading edge film cooling squealer tip increased greatly when the blowing ratio increased if compared with the other two kinds of cooling squealer tips.