The excessive wear of the piston rings and cylinder liners in large bore low-speed marine diesel engine could be occurred by various factors. Furthermore, several factors are combined to contribute for the excessive wear. Therefore, one of the most important tasks in assessing the main causes that trigger the excessive wear is the detection of the initial stage of the degradation of the sliding friction behavior that induces the excessive wear. However, piston rings and cylinder liners of diesel engines on board on operating ships are very likely out of the initial stage of scuffing, and are very well at the final stages of the excessive wear when the engines are inspected for the incidents. Temperature monitoring systems have been widely installed to the engines for detecting the scuffing incidents to be induced, although the initial stage of the scuffing is superseded by the final stage of the abnormal wear when the systems detect abnormal signals of the temperature rises of the cylinder liners. Thus, the system is incapable in detecting the very initial stage of the scuffing that may lead to the excessive wear of the piston rings and cylinders. The authors have installed an automatic analyzer of iron content in the cylinder drain oil at a piston underside of on a ship for accumulating data necessary to estimate potential mechanisms of the excessive wear of the piston rings and cylinders. Changes of the iron content in the cylinder drain oil are believed to possess higher sensitivity to the change of friction behavior in the engine piston rings and cylinders comparing with the detectable temperature changes of cylinder liners by the conventional systems. The present paper reports the effects of operating conditions in large bore low-speed marine diesel engine focusing the wear of piston rings and cylinder liners based on the measured iron contents in the cylinder drain oil with respect to the operating time and macroscopic and microscopic metallographic structure observations made on the piston rings and cylinder liners. The experimental results on test bed and in laboratories are also presented. Furthermore, the potential mechanisms for the excessive and normal wear are proposed.


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    Titel :

    A study of wear phenomena of piston rings and cylinder liners of large bore low-speed marine diesel engines


    Beteiligte:


    Erscheinungsdatum :

    2007


    Format / Umfang :

    10 Seiten, 15 Bilder, 1 Quelle


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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