A mixed-lubrication model considering elastoplastic contact for a piston ring and application to a ring pack

Guo, Yibin; Lu, Xin; Li, Wanyou; He, Tao; Zou, Dequan

doi:10.1177/0954407014536149

Cited by 49 publications

(49 citation statements)

References 35 publications

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“…According to the work of Gu et al [ 19 ], the thermal effect of oil film has a limited influence on the oil film temperature distribution when the compression ring-cylinder liner system operates under the warm engine condition, and the oil film temperature can be assumed to be equal to the temperature of the cylinder liner. By using the measured cylinder liner temperatures at the piston dead centers, the cylinder liner temperature distribution T liner can be fitted by [ 58 ]: where T 1 and T 2 are the temperatures of cylinder liner at the top dead center and bottom dead center, m 1 is the distance from top dead center, m is the stroke length.…”

Section: Methodsmentioning

confidence: 99%

Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

et al. 2018

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In gasoline engines, CDA (cylinder deactivation) affects greatly the tribological performance of ring/liner system while reducing the emissions and improving the fuel economy. The analyses on the tribological performance of ring/liner system under the CDA mainly focus on the ideal circular cylinder liner and fixed fully flooded lubrication condition. In this study, a numerical investigation on the tribological performance of a compression ring-cylinder liner system is presented under the CDA with consideration of the cylinder liner deformation and the transition between the fully flooded and starved lubrication conditions. A mixed lubrication model coupled with oil transport model and JFO (Jacobson-Floberg-Olsson) conservative cavitation algorithm is proposed to evaluate the frictional properties. Based on the model, the tribological performance is investigated under the standard operation condition and the CDA. Meanwhile, the influence of cylinder liner deformation and oil supply on the tribological performance is also evaluated. Results show that the tribological performance of the compression ring-cylinder liner system is greatly changed when the CDA is adopted. In particular, under the CDA, the overall power loss and FMEP (friction mean effective pressure) value are increased about 27.29% and 53.51%. The study also demonstrates the necessity to consider the cylinder liner deformation and oil supply in the simulation of compression ring-cylinder liner system under the CDA.

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Section: Methodsmentioning

confidence: 99%

Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

et al. 2018

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“…Their model was also based on the GreenwoodTripp model and Reynolds equation. Recently, Guo et al [15] developed a mixed lubrication model for piston ring pack analysis. The elastoplastic contact of the ring/liner was considered in their model.…”

Section: Methods For Lubrication Improvementmentioning

confidence: 99%

Design approach for optimization of a piston ring profile considering mixed lubrication

Zhang

Xie

2016

Friction

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Abstract:To reduce the friction of a piston ring while maintaining a large oil film load-carrying capacity, an approach comprising of the inverse method and the sequential quadratic programming algorithm was proposed. The approach considers the variation of mixed lubrication and variable lubricant viscosity with temperature along the engine stroke, is developed to optimize the profile of a piston ring. A piston ring profile is represented by a polynomial function. A case study of the second piston ring shows that the proposed method can be applied for the optimization of a piston ring profile. In addition, this paper illustrates the effects of the degree of a polynomial function. The results show that the minimization of friction and maximization of oil film load-carrying capacity can be balanced simultaneously when the degree of the polynomial is 2 and 5.

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“…During the running of the textured ring, the temperature of oil affects significantly the frictional properties . To simulate the temperature of oil, a three‐dimensional energy equation is solved

\begin{matrix} lefttrue \\ c_{p} (ρu \frac{\partial T}{\partial x} + ρv \frac{\partial T}{\partial y} - (\frac{\partial}{\partial x} \int_{0}^{z} ρu d {normalz}^{'} + \frac{\partial}{\partial y} \int_{0}^{z} ρv d {normalz}^{'}) \frac{\partial T}{\partial z}) \\ = k_{p} \frac{\partial^{2} T}{\partial z^{2}} - \frac{T}{ρ} \frac{\partial ρ}{\partial T} (u \frac{\partial p}{\partial x} + v \frac{\partial p}{\partial y}) + μ [{((), \frac{\partial u}{\partial z})}^{2} + {((), \frac{\partial v}{\partial z})}^{2}], \end{matrix}

where T represents the temperature of oil, u and v represent the velocities of oil along the x direction and y direction, c p represents the specific heat capacity of oil, k p represents the thermal conductivity of oil.…”

Section: Mathematical Modelingmentioning

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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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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A mixed-lubrication model considering elastoplastic contact for a piston ring and application to a ring pack

Cited by 49 publications

References 35 publications

Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

Evaluation on the tribological performance of ring/liner system under cylinder deactivation with consideration of cylinder liner deformation and oil supply

Design approach for optimization of a piston ring profile considering mixed lubrication

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

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