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The Integrated Gas/Steam Nozzle With Steam Cooling: Part I — Application FREE

[+] Author Affiliations
Ivan G. Rice

Consultant, Spring, TX

Paper No. 84-GT-134, pp. V004T10A020; 8 pages
doi:10.1115/84-GT-134
From:
  • ASME 1984 International Gas Turbine Conference and Exhibit
  • Volume 4: Heat Transfer; Electric Power
  • Amsterdam, The Netherlands, June 4–7, 1984
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7949-8
  • Copyright © 1984 by ASME

abstract

The integration of multiple steam nozzles with the first-stage annular-gas nozzle to form a binary-flow system in a reheat-gas turbine is presented whereby steam is first used as an internal vane coolant before being expanded and accelerated for work extraction. Steam nozzles are located in “fat-body” type vanes. Trailing-edge impingement followed by reverse-serpentine-flow cooling takes place. Internal trailing-edge-steam nozzles produce either diffusion or shock-wave boundary-layer disturbance inside the trailing edge to enhance heat transfer. Externally, steam blanketing reduces nozzle-profile loss and improves film cooling effectiveness by reducing the surface viscosity and secondly by controlling suction-side aft-shock-wave development. A new vane shape coupled with a gas-turning-combustor system is suggested to improve vane-film-cooling effectiveness further.

Copyright © 1984 by ASME
Topics: Cooling , Nozzles , Steam
This article is only available in the PDF format.

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