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Development of a Model for Auto-Ignition Delays and its Use for the Prediction of Premix Combustion Reliability

[+] Author Affiliations
Roda Bounaceur, Pierre-Alexandre Glaude, Baptiste Sirjean, René Fournet

Université de Lorraine, Nancy, France

Pierre Montagne, Matthieu Vierling

GE Energy Product-Europe, Belfort, France

Michel Molière

Université de Technologie de Belfort Montbéliard, Belfort Cedex, France

Paper No. GT2016-57585, pp. V04BT04A030; 8 pages
doi:10.1115/GT2016-57585
From:
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 4B: Combustion, Fuels and Emissions
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4976-7
  • Copyright © 2016 by ASME

abstract

Except in diesel engine applications, auto-ignition is an unwanted event from a general safety and reliability standpoint. It is especially undesirable in the premixing process involved in most low NOx combustion technologies. Therefore, in addition to auto-ignition temperature, autoignition delay (AID) is a key data for the design of modern combustors including gas turbine ones. The authors have investigated the detailed kinetic mechanisms leading to autoignition and established practical AID correlations involving the fuel composition, its temperature, pressure and equivalence ratio. The correlations brought about during this program offer a good reconciliation between calculated and experimental AID through a wide range of fuel composition, initial temperature and pressure. Validations were mainly done against data acquired with experimental setups consisting in shock tubes and rapid compression machines. The auto-ignition delay times of methane, pure light alkanes and various blends representative of several natural gas and process-derived fuels have been reviewed. For each fuel mixture, this study procures a simple equation linking the auto-ignition delay time to the temperature, pressure and equivalence ratio. As a direct application of this work, the authors have evaluated the risk of auto ignition in the premixing zone of a combustor characterized by a residence time and an associated probability density function. The results of this simulation stress the key role of larger hydrocarbon in the risk of flash-back events.

Copyright © 2016 by ASME

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