Experimental Investigation on the Film-Cooling Adiabatic Effectiveness with Different Slot Inlet Hole Pitches

The film-cooling adiabatic effectiveness was investigated by the heat-transfer experimental method with different pitch between inlet holes of the slot film. The adiabatic wall temperature was measured to calculate the important parameter for film-cooling effectiveness, defined as adiabatic effectiveness. The slot film configurations featured no convergence and inlet holes perpendicular to slot lip. The main stream turbulent level was higher than 10% in all experiments. The experimental results indicate that the pitch between inlet holes plays important role in film-cooling effectiveness. The adiabatic film-cooling effectiveness increases with the decrease of the pitch between the inlet holes and the slot geometric parameter MIX_N.