Numerical Investigation of the Scavenging Process in Marine Two-Stroke Diesel Engines

Fredrik Herland Andersen, Johan Hult, Karl-Johan Nogenmyr, Stefan Mayer

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    Abstract

    The scavenging process is an integral part of any two-stroke internal combustion engine cycle whether it is spark ignited or compression ignited. The scavenging process is responsible for transporting the burned gases from the previous working stroke out of the combustion chamber to allow for the fresh charge or fresh air to enter for the next combustion/working stroke. This implies that the scavenging process is responsible for setting the initial condition for the combustion process, consequently affecting fuel economy, power output and emission of hazardous gases. Two-stroke diesel engines for marine propulsion are usually uniflow scavenged cross-head engines. In uniflow scavenged engines the scavenge air enters the cylinder via ports located near the bottom dead center and exits through an exhaust valve located in the cylinder head. The in cylinder flow is therefore concentrated in one direction which gives the method its name.
    In this study a CFD analysis of the scavenging process in the 4T50ME-X test engine at MAN Diesel & Turbo is presented. The CFD model uses the full engine geometry including a moving piston and valve combined with time resolved measurement data as boundary and initial conditions. The results are then validated with experimental data from the engine. Optical velocity measurements have been performed through a specially designed engine cover with optical access.
    Original languageEnglish
    Title of host publicationTechnical papers presented at the SAE/KSAE 2013 International Powertrains, Fuels & Lubricants Meeting
    Number of pages12
    PublisherSociety of Automotive Engineers
    Publication date2013
    DOIs
    Publication statusPublished - 2013
    EventSAE/KSAE 2013 International Powertrains, Fuels & Lubricants Meeting - COEX Convention & Exhibition Center, Seoul, Korea, Republic of
    Duration: 21 Oct 201323 Oct 2013
    http://www.sae.org/events/pfl/

    Conference

    ConferenceSAE/KSAE 2013 International Powertrains, Fuels & Lubricants Meeting
    LocationCOEX Convention & Exhibition Center
    Country/TerritoryKorea, Republic of
    CitySeoul
    Period21/10/201323/10/2013
    Internet address
    SeriesS A E Technical Papers
    Number2013-01-2647
    ISSN0148-7191

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