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Vane Endwall Heat Transfer for Smooth and Stepped Inlet Using Streamwise and Cross Stream Film Injection

[+] Author Affiliations
Pey-Shey Wu, Shun-Fu Chang

Da-Yeh University, Chang-Hua, Taiwan, R. O. C.

Paper No. GT2007-27850, pp. 661-670; 10 pages
doi:10.1115/GT2007-27850
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2007, Parts A and B
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4793-4 | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME

abstract

Cross film injection is employed in this study to generate a shear-induced secondary flow having the same sense of rotation as that of the passage vortex. Local heat transfer coefficient and film cooling effectiveness on the endwall surface are measured using liquid crystal techniques. The Reynolds number of the main flow based on the vane inlet velocity was fixed at ReC = 1.24×105 . The blowing ratio was 0.5, 1.0, or 2.0. The investigated endwall conditions before the vane entrance include a smooth endwall, an endwall with a forward-facing step, and an endwall with a backward-facing step. Cooling performance of the cross injection scheme is compared to that of streamwise, parallel injection, under the same coolant flow rate, endwall entrance condition, and the blowing ratio. The heat transfer results show that both cooling scheme have similar magnitude of overall heat transfer coefficient. In the film cooling results, cross injection shows a better attachment along the endwall. Also, the protected region is shifted towards the suction wall which may also help the cooling of the suction wall near the trailing edge. The cross injection is more advantageous than the streamwise parallel injection, regardless of the blowing ratio and the endwall conditions.

Copyright © 2007 by ASME
Topics: Heat transfer

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