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Title: Three-stage autoignition of gasoline in an HCCI engine: An experimental and chemical kinetic modeling investigation

Abstract

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 C, varying the equivalence ratio from 0.3 to 0.54, and the EGR (represented by N{sub 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 formore » gasoline and its surrogate. The results of the kinetic mechanism supporting this explanation are shown in this paper. (author)« less

Authors:
;  [1]
  1. UPMC Universite Paris 06, LGPPTS, Ecole Nationale Superieure de Chimie de Paris (France)
Publication Date:
OSTI Identifier:
21125482
Resource Type:
Journal Article
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 155; Journal Issue: 4; Other Information: Elsevier Ltd. All rights reserved; Journal ID: ISSN 0010-2180
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; DIESEL ENGINES; GASOLINE; AUTOIGNITION; TOLUENE; OCTANE; COMBUSTION; HEPTANE; BENZYL RADICALS; COMPARATIVE EVALUATIONS; TEMPERATURE RANGE 0273-0400 K; SIMULATION; EFFICIENCY; COMBUSTION KINETICS; Three-stage autoignition; Obstructed preignition

Citation Formats

Machrafi, Hatim, Cavadias, Simeon, and UPMC Universite Paris 06, Institut Jean Le Rond D'Alembert. Three-stage autoignition of gasoline in an HCCI engine: An experimental and chemical kinetic modeling investigation. United States: N. p., 2008. Web. doi:10.1016/J.COMBUSTFLAME.2008.04.022.
Machrafi, Hatim, Cavadias, Simeon, & UPMC Universite Paris 06, Institut Jean Le Rond D'Alembert. Three-stage autoignition of gasoline in an HCCI engine: An experimental and chemical kinetic modeling investigation. United States. https://doi.org/10.1016/J.COMBUSTFLAME.2008.04.022
Machrafi, Hatim, Cavadias, Simeon, and UPMC Universite Paris 06, Institut Jean Le Rond D'Alembert. 2008. "Three-stage autoignition of gasoline in an HCCI engine: An experimental and chemical kinetic modeling investigation". United States. https://doi.org/10.1016/J.COMBUSTFLAME.2008.04.022.
@article{osti_21125482,
title = {Three-stage autoignition of gasoline in an HCCI engine: An experimental and chemical kinetic modeling investigation},
author = {Machrafi, Hatim and Cavadias, Simeon and UPMC Universite Paris 06, Institut Jean Le Rond D'Alembert},
abstractNote = {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 C, varying the equivalence ratio from 0.3 to 0.54, and the EGR (represented by N{sub 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. (author)},
doi = {10.1016/J.COMBUSTFLAME.2008.04.022},
url = {https://www.osti.gov/biblio/21125482}, journal = {Combustion and Flame},
issn = {0010-2180},
number = 4,
volume = 155,
place = {United States},
year = {Mon Dec 15 00:00:00 EST 2008},
month = {Mon Dec 15 00:00:00 EST 2008}
}