Numerical Simulation of the Hydrodynamic Behaviour of the Lubricant Oil Film in Large Two-stoke Marine Diesel Engines

Nikolas Karvounis

    Research output: Book/ReportPh.D. thesis

    59 Downloads (Pure)

    Abstract

    The present thesis uses three dimensional computational fluid dynamics (CFD) to study sulfuric acid (H2SO4) and water (H2O) condensation in a large two-stroke marine diesel engine. The study comprises of three parts. In the first part a CFD engine model is presented coupled with a skeletal n-heptane mechanism and a reduced sulfur subset mechanism. The model perfor-mance is evaluated both quantitatively and qualitatively and subsequently the formation process of sulfuric oxides (SOx) and sulfuric acid is investi-gated. The second part utilizes the aforementioned engine model coupled with a fluid film model. Following the validation of the models against ex-perimental results, the setup is used to study the condensation of sulfuric acid and water vapor under various engine operating conditions. Finally, the third part explores the nucleation process of water vapor in the engine by using an Eulerian approach to model the nucleated water droplets. After the nucleation model is validated against experimental measurements from convergent-divergent nozzles it is applied to engine-like conditions.
    Original languageEnglish
    Place of PublicationKgs. Lyngby
    PublisherTechnical University of Denmark
    Number of pages119
    ISBN (Electronic)978-87-7475-559-3
    Publication statusPublished - 2019
    SeriesDCAMM Special Report
    NumberS259
    ISSN0903-1685

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