Article (Scientific journals)
Three-stage autoignition of gasoline in an HCCI engine: An experimental and chemical kinetic modeling investigation
Machrafi, Hatim; Cavadias, Simeon
2008In Combustion and Flame, 155 (4), p. 557-570
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Keywords :
Three-stage autoignition of gasoline; HCCI engine; Combustion; Kinetic mechanism; Obstructed preignition
Abstract :
[en] The alternative HCCI combustion mode presents a possible means for decreasing the Pollution with respect to conventional gasoline or diesel engines, while maintaining the efficiency of a diesel engine or even increasing it. This paper investigates the possibility Of using gasoline in an HCCI engine and analyzes the autoignition of gasoline in such an engine. The compression ratio that has been used is 13.5, keeping the inlet temperature at 70 degrees C, varying the equivalence ratio from 0.3 to 0.54, and the EGR (represented by N-2) ratio from 0 to 37 vol%. For comparison, a PRF95 and a Surrogate containing 11 vol% n-heptane, 59 vol% iso-octane, and 30 vol% toluene are used. A previously validated kinetic surrogate mechanism is Used to analyze the experiments and to yield possible explanations to kinetic phenomena. From this work, it seems quite possible to use the high octane-rated gasoline for autoignition purposes, even Under lean inlet conditions. Furthermore, it appeared that gasoline and its Surrogate, unlike PRF95, show a three-stage autoignition. Since the PRF95 does not contain toluene, it is Suggested by the Kinetic mechanism that the benzyl radical, issued from toluene, causes this so-defined "obstructed preignition" and delaying thereby the final ignition for gasoline and its surrogate. The results of the kinetic mechanism supporting this explanation are shown in this paper. (C) 2008 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Disciplines :
Energy
Physics
Engineering, computing & technology: Multidisciplinary, general & others
Chemical engineering
Author, co-author :
Machrafi, Hatim 
Cavadias, Simeon
Language :
English
Title :
Three-stage autoignition of gasoline in an HCCI engine: An experimental and chemical kinetic modeling investigation
Publication date :
2008
Journal title :
Combustion and Flame
ISSN :
0010-2180
eISSN :
1556-2921
Publisher :
Elsevier Science
Volume :
155
Issue :
4
Pages :
557-570
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 July 2011

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