Film cooling performance and optimization of ellipse conical holes on turbine vanes leading edge
Simulations were employed to study the film cooling effectiveness of ellipse conical holes on the leading-edge of turbine vane.The influences of two geometry parameters,forward and lateral expansion angle,on the adiabatic film cooling effectiveness were studied comparatively.And optimization was also conducted within the range of forward and lateral expansion angle,0°-18° and 0°-16°,respectively.Results showed that the ellipse conical hole with a forward expansion angle of 1.4° and a lateral expansion angle of 11.1° presented the highest film cooling effectiveness,which was 147.5％higher than that of the cylindrical hole.Moreover,the relationship between the two geometry parameters and the film cooling effectiveness can be fitted to quartic function.When lateral expansion angle was low,the film cooling effectiveness increased with forward expansion angle.Otherwise,the film cooling effectiveness decreased with forward expansion angle.Additionally,when forward expansion angle was lower,the film cooling effectiveness increased and then decreased with lateral expansion angle.And the film cooling effectiveness was roughly constant or showed a small increase with lateral expansion angle.
film cooling effectivenessshaped holesexpansion angleturbine vaneleading edge
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