Preliminary study on the influence of Octane Sensitivity on knock statistics in a GDI engine

In the 3D-CFD practice, actual gasoline fuels are usually replaced by surrogate blends composed of Iso-Octane, n-Heptane and Toluene (Toluene Reference Fuels, TRFs). In this work, the impact of surrogate formulation on the probability of end-gas auto-ignition is investigated in a single cylinder eng...

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Autores principales:	Cicci Francesco, Cantore Giuseppe
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/61c30d2fabbd4eb5acc73faa17b77631
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spelling	oai:doaj.org-article:61c30d2fabbd4eb5acc73faa17b776312021-11-08T15:18:51ZPreliminary study on the influence of Octane Sensitivity on knock statistics in a GDI engine2267-124210.1051/e3sconf/202131207020https://doaj.org/article/61c30d2fabbd4eb5acc73faa17b776312021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/88/e3sconf_ati2021_07020.pdfhttps://doaj.org/toc/2267-1242In the 3D-CFD practice, actual gasoline fuels are usually replaced by surrogate blends composed of Iso-Octane, n-Heptane and Toluene (Toluene Reference Fuels, TRFs). In this work, the impact of surrogate formulation on the probability of end-gas auto-ignition is investigated in a single cylinder engine. CFD simulations are run on equal charge stratification to discern the effect of fuel reactivity from that of evaporation and mixing. Blends are formulated using an internal methodology, coupled with a proprietary method to predict knock statistical occurrence within a RANS framework. Chemical kinetics calculations of Ignition delay times are performed in a 0D constant pressure reactor using a mechanism for gasoline surrogates, proposed by the Clean Combustion Research Center of King Abdullah University of Science and Technology (KAUST), consisting of 2406 species and 9633 reactions. Surrogates mimic a commercial European gasoline (ULG95). Five different formulations are presented. Three are characterised by equal RON (95) with progressively decreasing Octane Sensitivity S. The fourth and the fifth have a sensitivity of 10 but with lower RON (92.5 and 90). The combinations allow the reader to separate the effects of octane sensitivity from those of RON quality of the tested fuels. Applying the different surrogates, changes in each of autoignition phasing, magnitude and statistical probability are investigated. Results confirm the dependency of knock occurrence on the Octane Sensitivity, as well as the need to include engine-specific and operation-specific characteristics in the analysis of knock. The Octane Index (OI) formulation developed by Kalghatgi is discussed.Cicci FrancescoCantore GiuseppeEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 312, p 07020 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Cicci Francesco Cantore Giuseppe Preliminary study on the influence of Octane Sensitivity on knock statistics in a GDI engine
description	In the 3D-CFD practice, actual gasoline fuels are usually replaced by surrogate blends composed of Iso-Octane, n-Heptane and Toluene (Toluene Reference Fuels, TRFs). In this work, the impact of surrogate formulation on the probability of end-gas auto-ignition is investigated in a single cylinder engine. CFD simulations are run on equal charge stratification to discern the effect of fuel reactivity from that of evaporation and mixing. Blends are formulated using an internal methodology, coupled with a proprietary method to predict knock statistical occurrence within a RANS framework. Chemical kinetics calculations of Ignition delay times are performed in a 0D constant pressure reactor using a mechanism for gasoline surrogates, proposed by the Clean Combustion Research Center of King Abdullah University of Science and Technology (KAUST), consisting of 2406 species and 9633 reactions. Surrogates mimic a commercial European gasoline (ULG95). Five different formulations are presented. Three are characterised by equal RON (95) with progressively decreasing Octane Sensitivity S. The fourth and the fifth have a sensitivity of 10 but with lower RON (92.5 and 90). The combinations allow the reader to separate the effects of octane sensitivity from those of RON quality of the tested fuels. Applying the different surrogates, changes in each of autoignition phasing, magnitude and statistical probability are investigated. Results confirm the dependency of knock occurrence on the Octane Sensitivity, as well as the need to include engine-specific and operation-specific characteristics in the analysis of knock. The Octane Index (OI) formulation developed by Kalghatgi is discussed.
format	article
author	Cicci Francesco Cantore Giuseppe
author_facet	Cicci Francesco Cantore Giuseppe
author_sort	Cicci Francesco
title	Preliminary study on the influence of Octane Sensitivity on knock statistics in a GDI engine
title_short	Preliminary study on the influence of Octane Sensitivity on knock statistics in a GDI engine
title_full	Preliminary study on the influence of Octane Sensitivity on knock statistics in a GDI engine
title_fullStr	Preliminary study on the influence of Octane Sensitivity on knock statistics in a GDI engine
title_full_unstemmed	Preliminary study on the influence of Octane Sensitivity on knock statistics in a GDI engine
title_sort	preliminary study on the influence of octane sensitivity on knock statistics in a gdi engine
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/61c30d2fabbd4eb5acc73faa17b77631
work_keys_str_mv	AT ciccifrancesco preliminarystudyontheinfluenceofoctanesensitivityonknockstatisticsinagdiengine AT cantoregiuseppe preliminarystudyontheinfluenceofoctanesensitivityonknockstatisticsinagdiengine
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Preliminary study on the influence of Octane Sensitivity on knock statistics in a GDI engine

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