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Assessment of the performance of alternative aviation fuel in a modern air-spray combustor (MAC)

Uryga-Bugajska, I, Ma, L, Pourkashanian, M, Catalanotti, E, Borman, DJ and Wilson, C (2008) Assessment of the performance of alternative aviation fuel in a modern air-spray combustor (MAC). In: ASME, , (ed.) ASME 2008 International Mechanical Engineering Congress and Exposition (IMECE2008). IMECE2008, October 31 - November 6, 2008, Boston, Massachusetts. The American Society of Mechanical Engineers . , 61 - 69. ISBN 978-0-7918-4864-7

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Abstract

Recent concerns over energy security and environmental considerations have highlighted the importance of finding alternative aviation fuels. It is expected that coal and biomass derived fuels will fulfil a substantial part of these energy requirements. However, because of the physical and chemical difference in the composition of these fuels, there are potential problems associated with the efficiency and the emissions of the combustion process. Over the past 25 years Computational Fluid Dynamics (CFD) has become increasingly popular with the gas turbine industry as a design tool for establishing and optimising key parameters of systems prior to starting expensive trials. In this paper the performance of a typical aviation fuel, kerosene, an alternative aviation fuel, biofuel and a blend have been examined using CFD modelling. A good knowledge of the kinetics of the reaction of bio aviation fuels at both high and low temperature is necessary to perform reliable simulations of ignition, combustion and emissions in aero-engine. A novel detailed reaction mechanism was used to represent aviation fuel oxidation mechanism. The fuel combustion is calculated using a 3D commercial solver using a mixture fraction/pdf approach. Firstly, the study demonstrates that CFD predictions compare favourably with experimental data obtained by QinetiQ for a Modern Airspray Combustor (MAC) when used with traditional jet fuel (kerosene). Furthermore, the 3D CFD model has been refined to use the laminar flamelet model (LFM) approach that incorporates recently developed chemical reaction mechanisms for the bio-aviation fuel. This has enabled predictions for the bio-aviation fuel to be made. The impact of using the blended fuel has been shown to be very similar in performance to that of the 100% kerosene, confirming that aircraft running on 20% blended fuel should have no significant reduction in performance. It was also found that for the given operating conditions there is a significant reduction in performance when 100% biofuel if used. Additionally, interesting predictions were obtained, related to NOx emissions for the blend and 100% biofuel.

Item Type: Proceedings Paper
Copyright, Publisher and Additional Information: Copyright © 2008 by ASME. Uploaded in accordance with the publisher's copyright transfer agreement.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Process, Environmental and Materials Engineering (Leeds) > Energy Tech & Innovation Initiative (Leeds)
The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds) > Inst for Pathogen Control Engineering (Leeds)
Depositing User: Miss Elizabeth Winning
Date Deposited: 21 Jan 2010 18:48
Last Modified: 16 Jul 2014 04:52
Published Version: http://dx.doi.org/doi:10.1115/IMECE2008-68772
Status: Published
Publisher: The American Society of Mechanical Engineers .
Identification Number: 10.1115/IMECE2008-68772
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/10310

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