To explore the difference of film cooling characteristics between small temperature ratio and real temperature ratio of the coolant and gas

the flow field

temperature field and film cooling efficiency of3-in-1hole injection film were studied

on the basis of Fluent software

by using the realizable k-ε model with temperature ratio of 1.1and 2.0

the blowing ratio of 0.5and 2.0.The results show that

at blowing ratio of 0.5

the diffusions of coolant with both temperature ratios are identical and the radial average cooling efficiency has little difference.At blowing ratio of 2.0

the coolant radial diffusion with temperature ratio of 2.0is better than that with temperature ratio of 1.1.The radial average cooling efficiency with temperature ratio of 2.0is about 13.4%to 55.5% higher.