NDLI: Turbine Durability Impacts of High Fuel-Air Ratio Combustors: Part 1 — Potential for Intra-Turbine Oxidation of Partially Reacted Fuel

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Stephen, P. Lukachko Daniel, R. Kirk Ian, A. Waitz
Copyright Year	2002
Abstract	Demand for greater engine efficiency and thrust-to-weight ratio has driven the production of aircraft engines with higher core temperatures and pressures. Such engines operate at higher fuel–air ratios, resulting in the potential for significant heat release through the turbine if energetic species emitted from the combustor are further oxidized. This paper outlines the magnitude and potential for turbine heat release for current and future engines. The analysis indicates that in the future, high fuel-air ratio designs may have to consider changes to cooling strategies to accommodate turbine heat release. A characteristic time methodology is developed to evaluate the chemical and fluid mechanical conditions that lead to combustion within the turbine. The local concentration of energetic emissions partly determines the potential for energy release. An energy release parameter, here defined as a maximum increase in total temperature (ΔTt), is used to specify an upper limit on the magnitude of impact. The likelihood of such impacts relies on the convective, mixing, and chemical processes that determine the fate and transport of energetic species through the turbine. Appropriately defined Damko¨hler numbers (Da)—the comparative ratio of a characteristic flow time (τflow) to a characteristic chemical time (τchem)—are employed to capture the macroscopic physical features controlling the flow-chemistry interactions that lead to heat release in the turbine.
Sponsorship	International Gas Turbine Institute
Starting Page	429
Ending Page	439
Page Count	11
File Format	PDF
ISBN	0791836061
DOI	10.1115/GT2002-30077
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	Turbine Design Durability Performance Emissions Oxidation Combustion chambers Fuels Turbines
Content Type	Text
Resource Type	Article

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