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Title: Assessment of elliptic flame front propagation characteristics of iso-octane, gasoline, M85 and E85 in an optical engine
Authors: Ihracska, Balazs
Korakianitis, Theodosios P.
Ruiz, Paula
Emberson, David Robert
Crookes, Roy James
Diez, Alvaro
Wen, Dongsheng
Keywords: Ethanol
Flame speed
Optical engine
Issue Date: Mar-2014
Publisher: Elsevier Ltd.
Source: Ihracska, B., Korakianitis, T., Ruiz, P., Emberson, D.R., Crookes, R.J., Diez, A., and Wen, D. (2014). Assessment of elliptic flame front propagation characteristics of iso-octane, gasoline, M85 and E85 in an optical engine. Combustion and Flame, 161(3), 696-710. doi:10.1016/j.combustflame.2013.07.020
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.
ISSN: 0010-2180
Appears in Collections:Mechanical Engineering / Makina Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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