Ihracska, B, Korakianitis, T, Ruiz, P et al. (4 more authors) (2014) Assessment of elliptic flame front propagation characteristics of iso-octane, gasoline, M85 and E85 in an optical engine. Combustion and Flame, 161 (3). pp. 696-710. ISSN 0010-2180
Abstract
Premixed fuel–air flame propagation is investigated in a single-cylinder, spark-ignited, four-stroke optical test engine using high-speed imaging. Circles and ellipses are fitted onto image projections of visible light emitted by the flames. The images are subsequently analysed to statistically evaluate: flame area; flame speed; centroid; perimeter; and various flame-shape descriptors. Results are presented for gasoline, isooctane, E85 and M85. The experiments were conducted at stoichiometric conditions for each fuel, at two engine speeds of 1200 rpm (rpm) and 1500 rpm, which are at 40% and 50% of rated engine speed. Furthermore, different fuel and speed sets were investigated under two compression ratios (CR: 5.00 and 8.14). Statistical tools were used to analyse the large number of data obtained, and it was found that flame speed distribution showed agreement with the normal distribution. Comparison of results assuming spherical and non-isotropic propagation of flames indicate non-isotropic flame propagation should be considered for the description of in-cylinder processes with higher accuracy. The high temporal resolution of the sequence of images allowed observation of the spark-ignition delay process. The results indicate that gasoline and isooctane have somewhat similar flame propagation behaviour. Additional differences between these fuels and E85 and M85 were also recorded and identified.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2013 The Combustion Institute. Published by Elsevier Inc. This is an author produced version of a paper published in Combustion and Flame. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Flame speed; Spherical; Optical engine; Ethanol; Methanol; Gasoline |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 Jun 2016 15:51 |
Last Modified: | 19 Jan 2018 22:34 |
Published Version: | http://dx.doi.org/10.1016/j.combustflame.2013.07.0... |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.combustflame.2013.07.020 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:95744 |