In order to investigate the flow and heat transfer performance of film cooling with internal coolant channel crossflow

narrowband transient liquid crystal measurement technique was used to gain the contours of cooling effectiveness and heat transfer coefficient downstream the film cooling hole for blowing ratios of 0.5

1 and 2 with internal coolant channel crossflow

and the detailed flow field characteristics inside film cooling hole and downstream region were obtained by numerical simulation. The results show that the internal coolant channel crossflow has a notable effect on distributions of cooling effectiveness and heat transfer coefficient downstream the film cooling hole. The crossflow enhances the ability of lateral spreading of film cooling hole injection

and the film cooling effect is improved at high blowing ratio. Furthermore

the asymmetric vortices appear downstream the film cooling hole

and the structures of vortices are more complicated.