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Effects of torch flame strength on the combustion process in medium-speed gas engines through pre-chamber orifice specifications
1
, Japan
Submission date: 2025-01-05
Final revision date: 2025-05-25
Acceptance date: 2025-05-27
Online publication date: 2025-07-10
Corresponding author
Takuya Wakasugi
Interdisciplinary Graduate School of Engineering Sciences (IGSES), Kyushu University, Japan
Interdisciplinary Graduate School of Engineering Sciences (IGSES), Kyushu University, Japan
KEYWORDS
TOPICS
ABSTRACT
Gas engines are eagerly introduced for the moment to reduce GHG emissions from the marine sector and could be used by green methane from the methanation process in the future. Pre-chamber-type gas engines burning lean premixture in a main chamber are the mainstream in a medium-speed engine range. Although the ejection behaviour of torch flames from the pre-chamber has a significant impact on the combustion in the main chamber, there are few research examples of confirming the effects of the pre-chamber specifications by actual observation of the combustion process. In this study, a constant-volume combustion vessel was prepared to reproduce the combustion chamber near the top dead centre of a medium-speed gas engine, to visualize its whole combustion chamber, and to investigate the effects of the pre-chamber specifications. The validity of the CFD simula-tion based on the RANS turbulence model and the possibility of a design index for the ejec-tion strength of torch flames were also examined.
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