Discharge Coefficient And Effectiveness Measurement For Conical Shaped Film Cooling Holes
Experimental measurements of discharge coefficient and effectiveness of conical shaped film cooling holes with 1°, 2° and 3° uniform diffusion angle are presented. All film holes are inclined at 35° with hole length to diameter ratio, L/D = 3.5, pitch to diameter ratio, PI/D = 3 with a constant density ratio of 1.26 and with nitrogen as the coolant. Results show that conical film holes have higher discharge coefficients than their cylindrical counterparts. For conical holes, the local distribution and laterally averaged effectiveness values decrease with increasing blowing ratio from 0.45 to 1. The configuration with 3° uniform diffusion angle has the highest effectiveness values and outperforms the conical holes with 1°, 2° diffusion angles by 40% in the proximity of the holes (X/D ≪5) at a blowing ratio of 0.45. Results are compared to base line cylindrical as well as to fan shape film holes available in open literature. The average effectiveness of the conical holes can reach values comparable to those achieved by fan shaped film holes at the same blowing ratio. Copyright © 2005 by ASME.
American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Number of Pages
Article; Proceedings Paper
Source API URL
Zuniga, H. A.; Krishnan, Vaidyanathan; and Sleiti, A. K., "Discharge Coefficient And Effectiveness Measurement For Conical Shaped Film Cooling Holes" (2005). Scopus Export 2000s. 3358.