CFD Approach on Gas Explosion for SIL in Gas Fuelled Ship

Abstract

It is envisaged that the effect of increasingly stricter air emissions legislation implemented through IMO Annex VI andother local air quality controls, together with favorable financial conditions for the use of natural gas instead of liquid fuel oil as abunker fuel, will see an increasing number of DF engine and single gas fuel engine applications to LNG carriers and other vesseltypes. As part of provision for the current international movements in the shipping industry to reduce GHG emission in air, newdesign concepts using natural gas as an alternative fuel source for propulsion of large commercial vessels, have been developed byshipyards and research institutes. In this study, an explosion analysis for a gas supply machinery room of LNG-fuelled container shipis presented. The gas fuel concept is employed for the high pressure ME-GI where a leakage in the natural gas double supply pipe tothe engines is the subject of the present analysis. The consequences of a leak are simulated with computational fluid dynamics (CFD)tools to predict typical leak scenarios, gas cloud sizes and possible explosion pressures. In addition, capacity of the structure which issubject to explosion loads has been assessed.