- The effect of film hole row location on leading edge film cooling effectiveness and heat transfer under high mainstream turbulence conditions was experimentally determined for flow over a blunt body with semi-cylinder leading edge and a flat afterbody. Two separate cases of film injection film holes located only at 15 and 40 were studied. The holes were spaced three hole-diameters apart in the spanwise direction and inclined 30 and 90 to the surface in the spanwise and streamwise directions, respectively. A bar grid (Tu = 5.07%), a passive grid (Tu = 9.67%), and a jet-grid (Tu = 12.9%) produced high mainstream turbulence. The incident mainstream Reynolds number based on cylinder diameter was 100,000. Spanwise and streamwise distributions of film effectiveness and heat transfer in the leading edge and the flat sidewall were obtained for three blowing ratios.