Numerical simulation was carried out to study the flow and heat transfer characteristics of film cooling on flat plate with different hole shapes including circle, fan, water-drop and converging slot. The results show that the counter-rotating vortex pair lifting up from the center have appeared in the outlet of film with circle-shaped, fan-shaped water-drop shaped hole, which will revolve the mainstream gas flow into the film coolant. Film from converging slot shows different flow characteristics.The slot with a spanwise expansion makes film spreading widely on the wall which effectively prevents the invasion of hot gas. Under the same blowing ratio, the cooling effectiveness of the converging slot hole is significantly better than the other three holes. With increasing blowing ratio, this advantage of the converging slot is more obvious.The impact of hole shape on heat transfer enhancement ratio is limited in the range of 7times of film hole diameter away from the outlet.
