Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges

Increasingly stringent policy on carbon dioxide have proved to be a severe constraint on the design of light two-stroke (2S) engines. The enhancement of efficiency is claimed to be the main target to make these devices compliant with future regulations. Low-Pressure Direct Injection (LPDI) was found...

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Autores principales:	Bosi Lorenzo, Ciampolini Marco, Raspanti Sandro, Romani Luca, Ferrara Giovanni
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/2c430778f8674ef3b8ce0b4302031ffb
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id	oai:doaj.org-article:2c430778f8674ef3b8ce0b4302031ffb
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spelling	oai:doaj.org-article:2c430778f8674ef3b8ce0b4302031ffb2021-11-08T15:18:51ZJet ignition in small two-stroke engines: an experimental survey on benefits and challenges2267-124210.1051/e3sconf/202131207012https://doaj.org/article/2c430778f8674ef3b8ce0b4302031ffb2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/88/e3sconf_ati2021_07012.pdfhttps://doaj.org/toc/2267-1242Increasingly stringent policy on carbon dioxide have proved to be a severe constraint on the design of light two-stroke (2S) engines. The enhancement of efficiency is claimed to be the main target to make these devices compliant with future regulations. Low-Pressure Direct Injection (LPDI) was found to be effective in the reduction of fuel short circuit, thus improving efficiency and mitigating pollution. Innovative combustion technologies are required to exploit further the fuel potential. Jet Ignition (JI), i.e., ignition provided by means of hot turbulent jets, was found to improve the fuel ignition process, leading to a faster and more uniform combustion. Several benefits are shown in over forty years of Literature, from the higher performance to wider flammability limits. However, few studies have been performed on small 2S engines, for which only full-load data are available. This paper aims at experimentally evaluating benefits and challenges of adopting the JI technology on light 2S LPDI engines at both full- and low- load operation. Different configurations of passive prechambers have been investigated in terms of indicated cycle, brake efficiency and cycle-to-cycle variation. A sensitivity analysis on the spark timing was performed to fine-tune the combustion process. Results show the adequacy of the JI for use in devices operating close to full torque, like garden tools; however, issues related to the excessive amount of residual gas or to the rapid pressure decrease during the expansion phase were highlighted. Different solutions for solving these challenges are proposed.Bosi LorenzoCiampolini MarcoRaspanti SandroRomani LucaFerrara GiovanniEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 312, p 07012 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Bosi Lorenzo Ciampolini Marco Raspanti Sandro Romani Luca Ferrara Giovanni Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges
description	Increasingly stringent policy on carbon dioxide have proved to be a severe constraint on the design of light two-stroke (2S) engines. The enhancement of efficiency is claimed to be the main target to make these devices compliant with future regulations. Low-Pressure Direct Injection (LPDI) was found to be effective in the reduction of fuel short circuit, thus improving efficiency and mitigating pollution. Innovative combustion technologies are required to exploit further the fuel potential. Jet Ignition (JI), i.e., ignition provided by means of hot turbulent jets, was found to improve the fuel ignition process, leading to a faster and more uniform combustion. Several benefits are shown in over forty years of Literature, from the higher performance to wider flammability limits. However, few studies have been performed on small 2S engines, for which only full-load data are available. This paper aims at experimentally evaluating benefits and challenges of adopting the JI technology on light 2S LPDI engines at both full- and low- load operation. Different configurations of passive prechambers have been investigated in terms of indicated cycle, brake efficiency and cycle-to-cycle variation. A sensitivity analysis on the spark timing was performed to fine-tune the combustion process. Results show the adequacy of the JI for use in devices operating close to full torque, like garden tools; however, issues related to the excessive amount of residual gas or to the rapid pressure decrease during the expansion phase were highlighted. Different solutions for solving these challenges are proposed.
format	article
author	Bosi Lorenzo Ciampolini Marco Raspanti Sandro Romani Luca Ferrara Giovanni
author_facet	Bosi Lorenzo Ciampolini Marco Raspanti Sandro Romani Luca Ferrara Giovanni
author_sort	Bosi Lorenzo
title	Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges
title_short	Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges
title_full	Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges
title_fullStr	Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges
title_full_unstemmed	Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges
title_sort	jet ignition in small two-stroke engines: an experimental survey on benefits and challenges
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/2c430778f8674ef3b8ce0b4302031ffb
work_keys_str_mv	AT bosilorenzo jetignitioninsmalltwostrokeenginesanexperimentalsurveyonbenefitsandchallenges AT ciampolinimarco jetignitioninsmalltwostrokeenginesanexperimentalsurveyonbenefitsandchallenges AT raspantisandro jetignitioninsmalltwostrokeenginesanexperimentalsurveyonbenefitsandchallenges AT romaniluca jetignitioninsmalltwostrokeenginesanexperimentalsurveyonbenefitsandchallenges AT ferraragiovanni jetignitioninsmalltwostrokeenginesanexperimentalsurveyonbenefitsandchallenges
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Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges

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