Influence of piston displacement on the scavenging and swirling flow in two-stroke diesel engines

Publication: ResearchConference abstract for conference – Annual report year: 2012

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We study the effect of piston motion on the in-cylinder swirling flow in a low speed, large two-stroke marine diesel engine. The work involves experimental, and numerical simulation using OpenFOAM platform, Large Eddy Simulation was used with three different models, One equation Eddy, Dynamic One equation Eddy, and Ta Phouc Loc model, to study the transient phenomena of the flow. The results are conducted at six cross sectional planes along the axis of the cylinder and with the piston displaced at four fixed piston positions covering the air intake ports by 0%,25%, 50%, and 75% respectively, for the fully opened case LES model with 8/12 million mesh points were used. We find that the flow inside the cylinder changes as the ports are closing, from a Rankine/Burger vortex profile to a solid body rotation while the axial velocity profiles change from a wake-like to a jet-like profile.
Original languageEnglish
Publication date2012
Number of pages5
StatePublished

Conference

Conference23rd Nordic Seminar on Computational Mechanics
Number23
CountrySweden
CityStockholm
Period21/10/1022/10/10
Internet addresshttp://congress.cimne.com/nscm-23/frontal/default.asp

Keywords

  • Diesel engine, Swirl, Scavenging, LES simulation
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