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

Li, Tongyang; Ma, Xuefei; Lu, Xin; Wang, Chuanjuan; Jiao, Bowen; Xu, Hanzhang; Zou, Dequan

doi:10.1177/1468087419872113

Cited by 28 publications

(25 citation statements)

References 26 publications

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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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“…The piston ring–cylinder liner (PRCL) conformation is a critical aspect for friction within the piston–liner section of the engine. 5,6 On one hand, limited ability of the piston rings to conform to the bore shape will lead to oil consumption and corresponding emission of particulate and hydrocarbons. On the other hand, higher piston ring tension, which is required to achieve the oil consumption and exhaust emission requirements, leads to increased friction losses and ultimately results in increased fuel consumption and GHG emissions.…”

Section: Introductionmentioning

confidence: 99%

Increasing the roundness of deformed cylinder liner in internal combustion engines by using a non-circular liner profile

Alshwawra

Pasligh

Hansen

et al. 2019

International Journal of Engine Research

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Increasing the efficiency of internal combustion engines is of major interest for reduced greenhouse gas emission. A significant improvement potential is given with the reduction of friction losses. Here, especially the friction between the piston ring and the cylinder liner is of interest. This article describes a study with the target to enhance the piston ring–cylinder liner conformation through increasing the roundness of the deformed liner during the warm operation state. The approach is based on the assumption that a non-circular liner in the cold state can deform due to thermal and mechanical stresses toward a circular shape under typical hot operation conditions. To test this hypothesis, a computational model for a gasoline engine was built and simulated using advanced finite element methods. The simulation describes the deformation process of the liner from the thermal and mechanical stresses. First, the deformation of a circular liner is simulated, showing asymmetric deformations of up to 30 µm in the warm state for the cylinder positioned at the end of the four-cylinder bank. As experimental data are readily available, a comparison was possible, showing good agreement. Then, three liner configurations with non-circular shape in the cold stage are investigated. For an elliptically shaped configuration, a nearly circular-shaped liner is reached under typical operation conditions. This numerical approach shows the potential for reduced friction of the piston–liner arrangement within internal combustion engines. The planned next step is the extension of this method to three-dimensional shape aspects and the application to the geometry of our test engine of our lab where friction can be measured in detail with a floating-liner measurement system.

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“…In addition, the fully flooded condition is assumed in the current study. The research on the deformation and starved lubrication can be found in Okamoto, 38 Liu et al, 39 Li et al, 40 Syed and Wani. 41…”

Section: Calculationmentioning

confidence: 99%

Crosshead bearing analysis for low-speed marine diesel engines based on a multi-body tribo-dynamic model

Meng

Liu

et al. 2020

International Journal of Engine Research

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An optimized lubrication condition of the crosshead bearing in low-speed marine diesel engines is pivotal to its prolonged service life, because the bearing oscillates at a low speed and the direction of the high load is always downward. Theoretical studies on the tribology of the crosshead bearing are very limited, with existing studies ignoring the effects of connecting rod inertia. Herein, a new multi-body tribo-dynamic model for the engine is presented by coupling the dynamics models of the connecting rod, piston assembly, and crosshead assembly with the mixed lubrication models of the multiple lubricated joints including the crosshead bearing. Based on this new multi-body tribo-dynamic model, the bearing load, journal center trajectories, friction torque, and minimum oil film thickness were calculated and compared with those based on the simplified method used in the previous literatures. The results show that due to the connecting rod inertia, the bearing load in the transverse direction calculated by the simplified algorithm is different from that calculated by the tribo-dynamic model proposed in this study. Compared with the results based on the previous simplified method, the inertia of the connecting rod reduces the friction torque of the bearing, especially at the end of the upward stroke.

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

Cited by 28 publications

References 26 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

Increasing the roundness of deformed cylinder liner in internal combustion engines by using a non-circular liner profile

Crosshead bearing analysis for low-speed marine diesel engines based on a multi-body tribo-dynamic model

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