|Effect Of Hole Shapes, Orientation And Hole Arrangements On Film Cooling Effectiveness
Prakhar Jindal, A.K. Roy and R.P. Sharma
International Journal of Aeronautical and Space Sicences, vol. 17, no. 3, pp.341-351, 2016
Abstract : In this present work, the effect of hole shapes, orientation and hole arrangements on film cooling effectiveness has been
carried out. For this work a flat plate has been considered for the computational model. Computational analysis of film
cooling effectiveness using different hole shapes with no streamwise inclination has been carried out. Initially, the model
with an inclination of 30° has been verified with the experimental data. The validation results are well in agreement with the
results taken from literature. Five different hole shapes viz. Cylindrical, Elliptic, Triangular, Semi-Cylindrical and Semi-Elliptic
have been compared and validated over a wide range of blowing ratios. The blowing ratios ranged from 0.67 to 1.67. Later,
orientation of holes have also been varied along with the number of rows and hole arrangements in rows. The performance
of film cooling scheme has been given in terms of centerline and laterally averaged adiabatic effectiveness. Semi-elliptic hole
utilizes half of the mass flow as in other hole shapes and gives nominal values of effectiveness. The triangular hole geometry
shows higher values of effectiveness than other hole geometries. But when compared on the basis of effectiveness and coolant
mass consumption, Semi-elliptic hole came out to give best results.
Keyword : CFD, Film cooling, hole shapes, blowing ratio, effectiveness, Orientation.