Numerical modeling of lubrication of piston ring of two-stroke marine diesel engine considering the effect of multi-scale grooves on the cylinder liner

Mohamad, Salaheldin A.; Lu, Xin; Zheng, Qun

doi:10.1177/1350650114556400

Cited by 27 publications

(28 citation statements)

References 22 publications

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“…The motion equation of ring should be considered to solve the instantaneous MOFT . In the current study, similar to the previous studies, the motion of ring can be described as

m \frac{d^{2} h_{0}}{normald t^{2}} = F_{oil} + F_{asp} - F_{bp} - F_{t},

where F oil represents the force of oil film, F asp represent the force caused by asperity contact, m represents the mass of ring.…”

Section: Mathematical Modelingmentioning

confidence: 69%

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Effect of surface texture on the improvement of tribological performance of ring‐deformed liner conjunction under different oil supplies

Liu

Lü

Zhang

et al. 2020

Lubrication Science

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In this work, a tribological performance analysis is numerically conducted for a surface‐textured ring‐deformed liner conjunction. In the analysis, three different distribution patterns of surface texture are designed and machined on the surface of ring. To evaluate the frictional properties of the textured rings under mixed lubrication regime, a transient lubrication model considering the oil film thermal effect is developed. Meanwhile, to evaluate the oil film consumption and the transition of lubrication condition in an engine cycle, an oil transport model is built to determine the boundary positions of lubrication zone. Based on the models, the oil consumption, MOFT (minimum oil film thickness), friction force, power loss, and FMEP (friction mean effective pressure) value of the textured ring are studied under different oil supplies. The frictional characteristics of the rings with various distribution patterns of surface texture are also analyzed and compared. The results show that the edge‐textured ring can improve the tribological performance significantly, and the improvement varies with the oil supply.

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“…The motion equation of ring should be considered to solve the instantaneous MOFT . In the current study, similar to the previous studies, the motion of ring can be described as

m \frac{d^{2} h_{0}}{normald t^{2}} = F_{oil} + F_{asp} - F_{bp} - F_{t},

where F oil represents the force of oil film, F asp represent the force caused by asperity contact, m represents the mass of ring.…”

Section: Mathematical Modelingmentioning

confidence: 69%

“…The suitable dimple parameters were obtained for the minimum average friction force. Mohamad et al investigated the potential use of circumferential liner grooves to improve the mixed lubrication performance of a ring. It was showed that the optimum grooves can substantially reduce the friction loss of the ring.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface texture on the improvement of tribological performance of ring‐deformed liner conjunction under different oil supplies

Liu

Lü

Zhang

et al. 2020

Lubrication Science

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“…The pressure boundary conditions in the axial direction can be expressed as [ 20 ]: where p 1 is the cylinder pressure and p 2 is the gas pressure under the compression ring. In practice, the cylinder pressure varies with time, and the gas pressure under the compression ring is almost equal to ambient pressure.…”

Section: Methodsmentioning

confidence: 99%

“…Zhou et al textured uniform shape dimples with different area densities and depth over diameter ratios on a cylinder liner to obtain higher load-carrying capacity and oil film thickness [ 19 ]. By texturing grooves with suitable shape and size on the cylinder liner, Mohamad et al obtained lower friction and higher hydrodynamic pressure [ 20 , 21 ]. These studies are mainly focused on the flat piston ring-cylinder liner system with dimples/grooves on the liner.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the lubrication performance of compression ring-cylinder liner system with spherical dimples

Liu

Zhang

et al. 2017

PLoS ONE

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The effects of surface texture on the lubrication performance of a compression ring-cylinder liner system are studied in this paper. By considering the surface roughness of the compression ring and cylinder liner, a mixed lubrication model is presented to investigate the tribological behaviors of a barrel-shaped compression ring-cylinder liner system with spherical dimples on the liner. In order to determine the rupture and reformulation positions of fluid film accurately, the Jacoboson-Floberg-Olsson (JFO) cavitation boundary condition is applied to the mixed lubrication model for ensuring the mass-conservative law. On this basis, the minimum oil film thickness and average friction forces in the compression ring-cylinder liner system are investigated under the engine-like conditions by changing the dimple area density, radius, and depth. The wear load, average friction forces, and power loss of the compression ring-cylinder liner system with and without dimples are also compared for different compression ring face profiles. The results show that the spherical dimples can produce a larger reduction of friction in mixed lubrication region, and reduce power loss significantly in the middle of the strokes. In addition, higher reduction percentages of average friction forces and wear are obtained for smaller crown height or larger axial width.

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“…The forces acting on the ring in the axial direction are shown in Fig. 2 and are expressed as follows [18]. The pressure force acting on the ring is given by [19]:…”

Section: Forces Acting On the Compression Ringmentioning

confidence: 99%

Parametric Analysis of the Effect of Engine Speed and Load on the Hydrodynamic Performance of the Lubricant in Diesel Engine

Menacer

Bouchetara²

2020

Period. Polytech. Mech. Eng.

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The oil consumption in an internal combustion engine is an important source of pollution and particulate emissions, main efforts are done by the manufacturers to reduce to the maximum the impact of the oil consumption on the emissions of the engine, and to satisfy the increasingly rigorous standards of pollution. The losses by friction due to piston ring friction explain 20 % of the total mechanical losses in internal combustion engines. A reduction in piston ring friction would therefore result in higher efficiency, lower fuel consumption and reduced emissions. The goal of this study is to develop a numerical method by using of GT-Suite software to analyze the influence of engine speed and engine load during the working cycle on oil film thickness, frictional force, power losses. Our predicted results were validated with the experimental data of a previous study, and they have shown a good agreement. The results in the current analysis demonstrated that the engine speed and load have a remarkable effect on oil film thickness, friction force and friction power losses between the top ring and cylinder liner. So, it would help in reducing friction as well as making a contribution towards the improvement of engine performance such as torque, efficiency and fuel consumption.

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Numerical modeling of lubrication of piston ring of two-stroke marine diesel engine considering the effect of multi-scale grooves on the cylinder liner

Cited by 27 publications

References 22 publications

Effect of surface texture on the improvement of tribological performance of ring‐deformed liner conjunction under different oil supplies

Effect of surface texture on the improvement of tribological performance of ring‐deformed liner conjunction under different oil supplies

Numerical study on the lubrication performance of compression ring-cylinder liner system with spherical dimples

Parametric Analysis of the Effect of Engine Speed and Load on the Hydrodynamic Performance of the Lubricant in Diesel Engine

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