In gasoline engines, a scraper ring with a step on the bottom outer edge is widely used as a second ring. However, there lacks a fundamental understanding on the effects of this feature and its dimensions on oil transport. Inspired by observations from visualization experiments, this work combining computational fluid dynamics (CFD) and theoretical analysis shows that oil can be trapped in the space bordered by a second ring step and the chamfer of a piston third land. The trapped oil can be released to a liner when the piston is approaching the top dead center (TDC). This additional oil on the liner becomes a potential source of oil consumption. Such oil transport has been observed at typically less than 1500rpm. Since road vehicles often operate in this speed range, the newly-observed oil trapping and release can be closely associated with oil consumption in gasoline engines. In this work, a comprehensive study on oil trapping and release will be demonstrated. Computational simulations indicated that oil trapping resulted from the balance between surface tension and inertia. A theoretical model based on the primary physics will be demonstrated. The modeling results satisfactorily matched with experiments and computational simulations. The model indicated that oil trapping in a scraper ring step, as well as oil release to a liner, can be controlled by the geometry of the step. Effects of a few dimensions of a scraper ring step will be described.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Oil Transport from Scraper Ring Step to Liner at Low Engine Speeds and Effect of Dimensions of Scraper Ring Step


    Weitere Titelangaben:

    Sae Int. J. Fuels Lubr
    Sae International Journal of Fuels and Lubricants


    Beteiligte:
    Tian, Tian (Autor:in) / Fang, Tianshi (Autor:in)

    Kongress:

    SAE 2016 World Congress and Exhibition ; 2016



    Erscheinungsdatum :

    2016-04-05


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    SCRAPER RING FOR VESSEL ENGINE

    Europäisches Patentamt | 2017

    Freier Zugriff

    Step with integrated mud scraper and storage

    GRABOWSKI THOMAS P / GIFFORD DANIEL C / IZARD BRIAN M | Europäisches Patentamt | 2018

    Freier Zugriff

    SCRAPER RING FOR VESSLE ENGINE AND THE MANUFACTURING METHOD THEREOF

    SONG JEONG SIK | Europäisches Patentamt | 2017

    Freier Zugriff

    Ice Scraper with Pivoting Scraper Head

    BRYANT CHARLES E | Europäisches Patentamt | 2016

    Freier Zugriff

    Scraper device, scraper system and method for assembling scraper system

    DEPONDT HELMUT / RENCKENS STEVEN | Europäisches Patentamt | 2022

    Freier Zugriff