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Discharge Coefficient and Effectiveness Measurement for Conical Shaped Film Cooling Holes

[+] Author Affiliations
H. A. Zuniga, Vaidyanathan Krishnan, A. K. Sleiti, J. S. Kapat, Sanjeev Bharani

University of Central Florida

Paper No. IMECE2005-81713, pp. 503-512; 10 pages
doi:10.1115/IMECE2005-81713
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Part A
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4221-5 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

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

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