Numerical Simulation of Methane Slip in Dual Fuel Marine Engines

Jaehyun Han, Michael Vincent Jensen, Kar Mun Pang, Jens Honore Walther, Jesper Schramm, Choongsik Bae

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    The methane slip is the problematic issue for the engines using natural gas(NG). Because methane is more powerful greenhouse gas (GHG) than CO2, understanding of the methane slip during gas exchange process of the engines is essential. In this study, the influence of the gas pipe geometry and the valve timings on the methane slip was investigated. MAN L28/32DF engine was modeled to simulate the gas exchange process of the four stroke NG-diesel dual fuel engines. The mesh size of the model was decided based on the sensitivity study on the peak pressure of the cylinder and the fuel mass estimations. The simulations with various gas pipe geometries were conducted. It seemed that the effect of the change in injection direction is more dominant than the change in the gas hole configuration. The favorable injection direction for minimum amount of methane slip was discovered as the direction which helps developing the flow of methane far from the exhaust ports. The effects of various valve timing settings were also simulated. The advancement of the exhaust valve closing was more efficient than the retardation of the intake valve opening. A little retardation of the intake valve opening even resulted in the increase of the amount of methane slip.
    Original languageEnglish
    Title of host publication대한기계학회 춘추학술대회
    PublisherThe Korean Society of Mechanical Engineers
    Publication date2017
    Publication statusPublished - 2017
    Event2017 KSME Annual Meeting - Jeju, Korea, Republic of
    Duration: 1 Nov 20173 Nov 2017


    Conference2017 KSME Annual Meeting
    Country/TerritoryKorea, Republic of


    • Methane Slip
    • CFD
    • 4 Stroke dual fuel marine engine
    • Natural gas
    • Gas pipe optimization
    • Valve timing
    • Un-burned methane emission


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