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Numerical and Experimental Investigations of the Influence of Different Swirl Ratios on the Temperature Streak Development in a 4-Stage Turbine

[+] Author Affiliations
Dieter Bohn, Harald Funke, Tom Heuer

Aachen University of Technology, Germany

Jürg Bütikofer

ABB Alstom Power, Baden, Switzerland

Paper No. 2000-GT-0250, pp. V003T01A056; 8 pages
doi:10.1115/2000-GT-0250
From:
  • ASME Turbo Expo 2000: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration
  • Munich, Germany, May 8–11, 2000
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7856-9
  • Copyright © 2000 by ASME

abstract

In the development of modern gas turbines the increase in the turbine inlet temperature is restricted by the need for cooling the first stages of the turbine. In addition, the flow leaving the combustor is thermally inhomogeneous. Since the blade cooling has to be designed for the actual local hot gas temperatures, it is important to know how these temperature inhomogeneities develop and attenuate inside the multistage flow passage.

In this investigation the development of a circumferential and a radial temperature inhomogeneity inside a 4-stage turbine is analyzed at three different swirl ratios. Since the experimental setup allows a circumferential temperature streak, a radial temperature streak has also been applied at different swirl ratios to the same geometrical configuration for a numerical investigation.

The first stage has a significant impact on the attenuation and change in form of a circumferential temperature streak depending on the swirl. For the radial streak the hot streak segregation effect can be eliminated by increasing the swirl. Consequently, the temperature equalization process is weakened.

Copyright © 2000 by ASME
Topics: Temperature , Turbines

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