NDLI: Importance of Inlet Total Pressure Conditions in Evaluating Performance of Non-Symmetric Gas Turbine Exhaust Ducts

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cunningham, M. H. Birk, A. M. Bartolomeo, W. Di
Copyright Year	2002
Abstract	When highly non-symmetric exhaust ducts are installed on a gas turbine engine, the asymmetries result in a non-uniform circumferential total pressure condition at the inlet of the duct. When testing these ducts experimentally or computationally the correct inlet conditions are often not known or cannot be reproduced. To study the sensitivity of duct performance to inlet conditions, an experimental and computational study of a non-symmetric gas turbine exhaust duct that includes a 160° turn with an annular to rectangular transition, has been carried out over a range of inlet conditions. The inlet conditions varied include circumferential total pressure profiles and swirl. The experimental studies have been carried out in cold flow with several non-uniform total pressure inlet conditions. Computational fluid dynamic (CFD) techniques validated against the experimental results, have been used to extend the range of inlet conditions beyond the range that could be obtained experimentally to those typical of an engine installation. Results show that the total pressure inlet conditions have a significant effect on the flow structure in the exhaust duct and that the performance of the exhaust duct degrades as the level of circumferential non-uniformities increase. However, trends in geometric optimization identified experimentally using cold flow and uniform total pressure inlet conditions are confirmed computationally with circumferential non-uniformities typical of actual engine operations. This suggests that although inlet conditions are important for determining the level of performance, the configuration of the optimized geometry is somewhat independent of the inlet conditions.
Sponsorship	International Gas Turbine Institute
Starting Page	103
Ending Page	109
Page Count	7
File Format	PDF
ISBN	0791836061
DOI	10.1115/GT2002-30499
e-ISBN	0791836010
Volume Number	Volume 1: Turbo Expo 2002
Conference Proceedings	ASME Turbo Expo 2002: Power for Land, Sea, and Air
Language	English
Publisher Date	2002-06-03
Publisher Place	Amsterdam, The Netherlands
Access Restriction	Subscribed
Subject Keyword	Geometry Gas turbines Computational fluid dynamics Ducts Pressure Flow (dynamics) Engines Optimization Exhaust systems Testing
Content Type	Text
Resource Type	Article

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