Effect of Film Injection Location on Local Heat Transfer Coefficient on a Gas Turbine Blade

Abstract

Experiments were performed to study the effect of film hole location on Nusselt numbers over a blade model without film holes. An increase in mainstream turbulence intensity causes an increase in Nusselt numbers over most of the blade surface, for both coolants, and at all blowing ratios. Film injection promotes an earlier boundary layer transition on the suction surface and the onset of transition depends on the film injection location; but at high turbulence levels, transition location is almost independent of film injection location.