Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

The Synergy Between Methanol M100 and Plasma Assisted Ignition System PAI to Achieve Increasingly Leaner Mixtures in a Single-Cylinder Engine.

Federico Ricci
ORCID logo ,
Francesco Mariani
ORCID logo ,
Stefano Papi
ORCID logo ,
Jacopo Zembi
* ORCID logo ,
Michele Battistoni
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Carlo Nazareno Grimaldi
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Version 1 : Received: 4 March 2024 / Approved: 5 March 2024 / Online: 5 March 2024 (06:42:22 CET)

A peer-reviewed article of this Preprint also exists.

Ricci, F.; Mariani, F.; Papi, S.; Zembi, J.; Battistoni, M.; Grimaldi, C.N. The Synergy between Methanol M100 and Plasma-Assisted Ignition System PAI to Achieve Increasingly Leaner Mixtures in a Single-Cylinder Engine. Energies 2024, 17, 1659. Ricci, F.; Mariani, F.; Papi, S.; Zembi, J.; Battistoni, M.; Grimaldi, C.N. The Synergy between Methanol M100 and Plasma-Assisted Ignition System PAI to Achieve Increasingly Leaner Mixtures in a Single-Cylinder Engine. Energies 2024, 17, 1659.

Abstract

Currently, conventional spark-ignition engines face challenges in meeting the ever-growing demands of customers and increasingly stringent regulations regarding pollutant emissions. A combination of innovative strategies and carbon-neutral fuels is deemed necessary in order to further reduce fuel consumption and minimize engine emissions. The present work aims to assess the performance of combustion strategies using low-carbon content fuel, such as methanol M100, ignited by a plasma-assisted igniter (PAI) under ultra-lean conditions. The experimental campaign is conducted on a single-cylinder research engine at different engine speeds and low loads, moving up to the engine lean stable limits. To determine the benefits brought by the proposed strategy, referred to as M100-PAI, the obtained outcomes are compared with the ones obtained using market gasoline E5 ignited by the PAI system and conventional spark. The synergy between M100 (methanol) and Plasma Assisted Ignition (PAI) in internal combustion engines yielded notable benefits. This combination significantly improved combustion stability if compared to the other combinations tested, by extending the lean stable limit to λ=2.0, reducing cycle-to-cycle variability, and facilitating faster flame front acceleration, resulting in enhanced homogeneity. These enhancements, obtained with the combination M100-PAI, contributed to higher fuel efficiency showing a 10% efficiency gain over the combination E5-gasoline spark ignition.

Keywords

lean combustion; kinetic; methanol fuel; Plasma Assisted Ignition; SI engine

Subject

Engineering, Automotive Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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