Experimental Piston Ring Tribology for Marine Diesel Engines

Klit, Peder; Vølund, Anders

doi:10.1115/ijtc2008-71160

Cited by 5 publications

(3 citation statements)

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“…Unfortunately, models of lubrication in marine applications are more challenging to verify than those for automotive systems due to the operating cost and scale of marine engines. Tests have been conducted in bench test apparatus [11] and engine scale laboratory test equipment [12], but they do not fully replicate the true conditions of operating engines. However, some limited data is available.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurement of the Time-Based Development of Oil Film Thickness, Lubricating Film Extent and Lubricant Transport in Crosshead Engines

2020

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This paper describes the design of a test apparatus which simulates the lubrication of large, slow, two-stroke marine engines in which the ring pack is lubricated by means of injectors supplying lubricant above the piston. The equipment is able to control lubricant injection parameters (volume, frequency, etc.) and employs capacitance based lubricant film thickness transducers to allow instantaneous oil film thickness and film extent around the compression ring to be investigated on a stroke-by-stroke basis. It is demonstrated that the equipment can be used to study the development of lubricating films on successive strokes under differing injection strategies. Time varying changes in lubricating film thickness and film extent have been measured and the rate at which the lubricant spreads across the cylinder wall has also been investigated. It has been observed that increases in oil-film thickness are strongly linked to the transition from starved to fully-flooded inlet conditions and that net lubricant transport rates along different parts of the cylinder can be evaluated from measured data.

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Section: Introductionmentioning

confidence: 99%

Experimental Measurement of the Time-Based Development of Oil Film Thickness, Lubricating Film Extent and Lubricant Transport in Crosshead Engines

2020

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“…Li et al 10 developed a numerical model to study the influence of the oil supply on the lubrication performance in a two-stroke marine diesel engine. Klit et al 9 concluded that a two-stroke engine's rings experienced three lubrication regimes (full-film, mixed, and boundary lubrication) during the operation by measuring the friction force of the PRCL with a test rig. Boundary lubrication is the lubrication regime where the interface behavior is dominated by chemical reactions that happen at the surfaces, tribofilm formation occurs, and the load is carried by the asperities.…”

Section: Introductionmentioning

confidence: 99%

An improved contact model considered the effect of boundary lubrication regime on piston ring-liner contact for the two-stroke marine engines from the perspective of the Stribeck curve

Xiuyi

Jiao

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The prediction of lubrication performance is required to be the basement of friction optimization for marine engines. This paper simulates the lubrication performance of marine engines based on statistical models which have the advantages of fast, efficient, and macroscopic fault location. Boundary lubrication exists in the piston ring-cylinder liner (PRCL) of two-stroke marine engines because of the harsher load, lower speed, and larger structure. It has been proposed that there would be tribofilm under boundary lubrication which has a significant influence on the contact. To understand the boundary lubrication, it is necessary to study the lubrication regime transition. In this paper, firstly, the coefficient of friction curve combined with the thickness ratio embodies the lubrication regime transition process of two-stroke engines under work conditions. However, the phenomenon that the coefficients under boundary lubrication are smaller than that of other regimes shows the non-objectivity of this curve. Therefore, the Stribeck curve is introduced for objectively evaluating the transition. Then, the calculation of asperities contact pressure under boundary lubrication, which Wen proposed, is introduced into the classic Greenwood-Williamson model, the problem that the original model cannot reflect the boundary lubrication regime in the form of the Stribeck curve is improved. Finally, the results are compared before and after modifying the model to verify this study’s practicability. It provides more precise asperities contact pressure for the tribofilm growth calculation from the perspective of the Stribeck curve under the PRCL statistical model in future work.

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“…However, there have been only a few studies of piston ring lubrication of two-stroke MDEs. Klit and Vølund 14 used a test rig to measure the friction force between the friction pairs in a two-stroke MDE and found that the ring experienced three lubrication regimes in each stroke. For the liner surface of a two-stroke MDE, Mohamad et al 15,16 studied the effect of different groove parameters on the friction force.…”

Section: Introductionmentioning

confidence: 99%

Lubrication analysis for the piston ring of a two-stroke marine diesel engine taking account of the oil supply

et al. 2019

International Journal of Engine Research

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The piston ring is one of the most important parts of a two-stroke marine diesel engine. It is lubricated by a special mode in which the lubricating oil is directly injected into the liner’s inner surface. In this article, taking account of the oil supply, a piston ring lubrication model is developed based on oil mass conservation. The lubrication region of this piston ring–cylinder liner is divided into inlet, core lubrication, and outlet regions, with the oil supply being converted into an oil film. The impact of the width of the core lubrication region on squeezing of the oil is considered. To verify the model, friction force measurements are performed in a reciprocating bench test under fully flooded conditions, and the model is further validated by comparing the minimum oil film thickness with data from the literature. The model is applied to the top ring of a two-stroke marine diesel engine, and the impacts of the oil supply and its design parameters are analyzed.

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Experimental Piston Ring Tribology for Marine Diesel Engines

Cited by 5 publications

References 0 publications

Experimental Measurement of the Time-Based Development of Oil Film Thickness, Lubricating Film Extent and Lubricant Transport in Crosshead Engines

Experimental Measurement of the Time-Based Development of Oil Film Thickness, Lubricating Film Extent and Lubricant Transport in Crosshead Engines

An improved contact model considered the effect of boundary lubrication regime on piston ring-liner contact for the two-stroke marine engines from the perspective of the Stribeck curve

Lubrication analysis for the piston ring of a two-stroke marine diesel engine taking account of the oil supply

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