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Experimental Study of the Thermal Development in a Rotating Square-Ended U-Bend

[+] Author Affiliations
Hector Iacovides, Diamantis Kounadis, Brian E. Launder

University of Manchester, Manchester, UK

Zeyuan Xu

Brunel University, Uxbridge, Middlesex, UK

Paper No. GT2006-90846, pp. 647-655; 9 pages
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4238-X | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME


This paper reports an experimental study of the thermal development in an idealized model of a blade cooling passage of smooth inner surfaces, comprising a square-ended U-bend with a cross-section that changes from a square upstream to a 2:1 rectangle downstream of the turn. The two flat walls are heated electrically, while the outer wall and the splitter plate are thermally insulated. The steady state liquid crystal technique is used to map the local Nusselt number variation. Measurements are obtained using a stationary air flow facility and also a rotating water flow facility. This enables us to investigate the effects on the thermal development of Reynolds variation from 30,000 to 100,000, Prandtl numbers of 0.7 and 5.8, and rotation numbers, from 0 to 0.4. The effects of minor modifications in the cross-sectional area at the bend exit, on the thermal development, under both stationary and rotating conditions, are also explored.

Copyright © 2006 by ASME



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