Streamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads

Engine research community interest in the Radio-Frequency corona-based ignition systems is currently gaining in importance mainly due to their capability to ensure robust combustion at challenging operating conditions such as very lean mixture and/or high EGR dilution. The benefits of Corona low-tem...

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Autores principales:	Ricci Federico, Martinelli Roberto, Petrucci Luca, Discepoli Gabriele, Grimaldi Carlo Nazareno, Papi Stefano
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/4a6d2678c7a742a392919c21714af29d
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spelling	oai:doaj.org-article:4a6d2678c7a742a392919c21714af29d2021-11-08T15:18:51ZStreamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads2267-124210.1051/e3sconf/202131207021https://doaj.org/article/4a6d2678c7a742a392919c21714af29d2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/88/e3sconf_ati2021_07021.pdfhttps://doaj.org/toc/2267-1242Engine research community interest in the Radio-Frequency corona-based ignition systems is currently gaining in importance mainly due to their capability to ensure robust combustion at challenging operating conditions such as very lean mixture and/or high EGR dilution. The benefits of Corona low-temperature plasma foster the early flame development thanks to combustion precursors production and to a more energetic and volumetric discharge, resulting in a larger amount of involved mixture. The corona discharge generates ionizing waves, named streamers, whose temporal and spatial variability in orientation, length and branching can affect the combustion onset and, therefore, the engine cycle-to-cycle variability. In this work, the discharge natural luminosity of a RF corona igniter, characterized by four tips electrodes, was recorded in an optically accessible engine via high-speed camera detection. A preliminary statistical analysis of the spatial and temporal streamer variability was performed by operating in motored conditions. Four different engine speeds and two different loads were explored in order to deeply investigate the streamer behaviour at diverse engine operating conditions. A comparison between a motored and a lean operating condition is also proposed to analyse, at a specific engine speed, the mixture influence on the streamers propagation before the start of the combustion.Ricci FedericoMartinelli RobertoPetrucci LucaDiscepoli GabrieleGrimaldi Carlo NazarenoPapi StefanoEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 312, p 07021 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Ricci Federico Martinelli Roberto Petrucci Luca Discepoli Gabriele Grimaldi Carlo Nazareno Papi Stefano Streamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads
description	Engine research community interest in the Radio-Frequency corona-based ignition systems is currently gaining in importance mainly due to their capability to ensure robust combustion at challenging operating conditions such as very lean mixture and/or high EGR dilution. The benefits of Corona low-temperature plasma foster the early flame development thanks to combustion precursors production and to a more energetic and volumetric discharge, resulting in a larger amount of involved mixture. The corona discharge generates ionizing waves, named streamers, whose temporal and spatial variability in orientation, length and branching can affect the combustion onset and, therefore, the engine cycle-to-cycle variability. In this work, the discharge natural luminosity of a RF corona igniter, characterized by four tips electrodes, was recorded in an optically accessible engine via high-speed camera detection. A preliminary statistical analysis of the spatial and temporal streamer variability was performed by operating in motored conditions. Four different engine speeds and two different loads were explored in order to deeply investigate the streamer behaviour at diverse engine operating conditions. A comparison between a motored and a lean operating condition is also proposed to analyse, at a specific engine speed, the mixture influence on the streamers propagation before the start of the combustion.
format	article
author	Ricci Federico Martinelli Roberto Petrucci Luca Discepoli Gabriele Grimaldi Carlo Nazareno Papi Stefano
author_facet	Ricci Federico Martinelli Roberto Petrucci Luca Discepoli Gabriele Grimaldi Carlo Nazareno Papi Stefano
author_sort	Ricci Federico
title	Streamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads
title_short	Streamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads
title_full	Streamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads
title_fullStr	Streamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads
title_full_unstemmed	Streamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads
title_sort	streamers variability investigation of a radio-frequency corona discharge in an optical access engine at different speeds and loads
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/4a6d2678c7a742a392919c21714af29d
work_keys_str_mv	AT riccifederico streamersvariabilityinvestigationofaradiofrequencycoronadischargeinanopticalaccessengineatdifferentspeedsandloads AT martinelliroberto streamersvariabilityinvestigationofaradiofrequencycoronadischargeinanopticalaccessengineatdifferentspeedsandloads AT petrucciluca streamersvariabilityinvestigationofaradiofrequencycoronadischargeinanopticalaccessengineatdifferentspeedsandloads AT discepoligabriele streamersvariabilityinvestigationofaradiofrequencycoronadischargeinanopticalaccessengineatdifferentspeedsandloads AT grimaldicarlonazareno streamersvariabilityinvestigationofaradiofrequencycoronadischargeinanopticalaccessengineatdifferentspeedsandloads AT papistefano streamersvariabilityinvestigationofaradiofrequencycoronadischargeinanopticalaccessengineatdifferentspeedsandloads
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Streamers Variability Investigation of a Radio-Frequency Corona Discharge in an Optical Access Engine at Different Speeds and Loads

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