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The Design of Fabricated Ducts to Avoid Gas Induced High Cycle Fatigue PUBLIC ACCESS

[+] Author Affiliations
R. Eaton, J. Platt, S. Gallimore

European Gas Turbines Ltd., Lincoln, UK

Paper No. 97-GT-109, pp. V004T14A025; 5 pages
doi:10.1115/97-GT-109
From:
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME

abstract

The design and fatigue life analysis of many fabricated sheet metal components which operate in a hot gas path environment is made uncertain by the difficulty in predicting the gas dynamic forces to which the component will be subjected. This is particularly true for ducts which are exposed to minimal static loading such as inter-turbine ducts, which have little pressure drop across them but are subjected to highly non-uniform flow from the upstream turbine exit. Finite element analysis and static testing has revealed — that certain modal frequencies respond much more significantly than others and where these coincide with gas dynamic frequencies a resonance is set up and rapid and catastrophic failure will occur.

Through a combination of analysis and engine testing it has been possible to identify the damaging gas dynamics and modal frequencies. This has enabled rules to be developed which assist in the design of such ducts to avoid high cycle fatigue failure.

This paper describes the development of the design process and by means of a typical example shows its application and effect on the design of an inter-turbine duct.

Copyright © 1997 by ASME
This article is only available in the PDF format.

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