Research on the influence of the lubrication status at the inlet on the lubrication characteristics of engine piston ring

Sun, Jun; Zhu, Jianxiong; Wang, Hu; Zhao, Xilu; Teng, Quincy; Ren, Yan-Xia; Zhu, Guangcan; Zhang, Xiao; Gao, Yaming

doi:10.1002/ls.1505

Cited by 8 publications

(6 citation statements)

References 34 publications

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“…Studies 12–15 show that piston rings, especially the top ring, suffer from starved lubrication during an engine cycle. Compared with the assumption of fully flooded lubrication, 7,16,17 the starved lubrication model considering inlet flow conservation is closer to the actual working conditions 11,18–20 . Under starved lubrication, the oil storage effect of textures cannot be ignored, especially when the textures are distributed on cylinder liner, the influence of dynamic characteristics of moving textures is particularly prominent.…”

Section: Introductionmentioning

confidence: 90%

“…Compared with the assumption of fully flooded lubrication, 7,16,17 the starved lubrication model considering inlet flow conservation is closer to the actual working conditions. 11,[18][19][20] Under starved lubrication, the oil storage effect of textures cannot be ignored, especially when the textures are distributed on cylinder liner, the influence of dynamic characteristics of moving textures is particularly prominent. Most of the existing theoretical studies on cross-hatched textures are based on fully flooded lubrication.…”

Section: Introductionmentioning

confidence: 99%

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Study on the moving cross‐hatched textures under starved lubrication based on parallel calculation

Meng

Zhang

et al. 2022

Lubrication Science

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The oil storage effect of textures is beneficial for lubrication performance under starved lubrication. When the larger of the two surfaces in friction pairs is textured, the moving textures should be considered because the boundary conditions are transiently changed at each moment. This is especially for the cross-hatched textures, which are manufactured on the cylinder liner while not on the piston ring. However, it means that the calculation cost will be very expensive for engineering friction pairs because the required calculation scale is very large and the required time step is very small. So the dynamic characteristics of moving textures on engineering surfaces are normally neglected in the existing researches. In this study, a starved lubrication model of the piston ring-cylinder liner (PRCL) system is established considering the oil storage effect, local hydrodynamic effect and dynamic characteristics of the moving cross-hatched textures. To speed up the calculation, an efficient parallel algorithm is developed. The results show that there is a significant difference in minimum oil film thickness (MOFT), wear load and oil film boundaries between stationary textures and moving textures, so the moving textures should not be simplified. This is helpful to find a better design of textures for engineering friction pairs.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Study on the moving cross‐hatched textures under starved lubrication based on parallel calculation

Meng

Zhang

et al. 2022

Lubrication Science

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“…Figure 5 shows the loads acted on point M1, M2 of the piston ring. The contact force of asperity is considered in line with a more realistic force situation, while the friction force from piston grooves and inertial force of the piston ring can be ignored because they are insignificant compared with other forces in the radial direction 4 when the lubricant is considered to be sufficient. The equilibrium equation of radial loads can be written as…”

Section: Equilibrium Equation Of Loadsmentioning

confidence: 99%

“…3 For the past years, much research work has been focused on developing a prefect lubrication model for oil film thickness estimation and tribological analysis, in which more and more actual factors are considered and the analysis accuracy is greatly improved. 4 Rohde 5 firstly built a mixed lubrication model which combined average Reynolds equation and asperity contact model. In this model, the flow factors 6 and the contact factor 7 are both used to describe rough surface influence for actual mixed friction condition.…”

Section: Introductionmentioning

confidence: 99%

Analysis of circumferential oil film thickness for piston ring in twin-rotor piston engine under differential velocity motion of combined annular cylinder

Yang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, a novel type of twin-rotor piston engine (TRPE) is proposed, and the circumferential oil film thickness for the piston ring in TRPE is analysed. Different from the integrated cylinder of a typical engine, the combined annular cylinder (CAC) of TRPE has unique structural composition and differential velocity motion characteristic, making the tribological performance more complicated. The main purpose of this paper is to reveal and explain the special tribological performance of TRPE, which has never been studied. Firstly, the special structural composition of CAC is introduced and the relative velocity between the piston ring and CAC wall at different circumferential positions of the piston ring is analysed. Then, based on the Greenwood-Trip asperity contact theory, radial and axial quasi-static equilibrium equations of the piston ring are both derived. The circumferential oil film thickness is calculated by solving the equilibrium equations and the two-dimensional average Reynolds equation within a cycle. Results indicate that there are significant differences in circumferential oil film thickness of the piston ring due to the special structure and motion of CAC, and the differences become greater as the output shaft speed increases. A long-time engine reverse towing experiment shows an obvious uneven wear phenomenon of the piston ring and CAC wall, which well validates the simulation results of the circumferential oil film thickness. The research work can be used as the basis of equal-wear design for the piston ring in TRPE with the help of surface texture technology, thereby greatly reducing the wear loss.

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“…This implies that the reliability, performance, and useful life of the engine are strongly influenced by the working conditions in the union between the cylinder liner and the piston ring. The conditions in this joint depend on the lubrication characteristics [12]. Therefore, tribological studies are necessary to search for an improvement in fuel economy and a reduction in harmful emissions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Textured Surfaces and Lubrication Conditions on the Tribological Performance between the Compression Ring and Cylinder Liner

2021

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The objective of the present investigation is to analyze the tribological performance between the union of the cylinder liner and the compression ring under the influence of surface texturing and different lubrication boundary conditions. The analysis is carried out by developing a numerical model, which involves hydrodynamic pressure, lubrication film thickness, textured surface, dynamic forces, and lubrication boundary conditions (starved lubrication and fully flooded lubrication). MATLAB® software (The MathWorks Inc., Natick, MA, USA) is used to solve the equations developed. The results show that the application of a textured surface on the cylinder liner allows obtaining a reduction of 20% and 5% in the asperity contact force and in the total friction force. Additionally, the textured surface allows for a 4% increase in MOFT. In this way, it is possible to reduce the power loss. The implementation of a boundary condition of fully flooded lubrication produces an overestimation in the total friction force due to the greater prominence of the lubrication film. Implementing a textured surface in the ring profile is an alternative way to reduce power loss. The results show that this alternative allows an 8% reduction in power loss.

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Research on the influence of the lubrication status at the inlet on the lubrication characteristics of engine piston ring

Cited by 8 publications

References 34 publications

Study on the moving cross‐hatched textures under starved lubrication based on parallel calculation

Study on the moving cross‐hatched textures under starved lubrication based on parallel calculation

Analysis of circumferential oil film thickness for piston ring in twin-rotor piston engine under differential velocity motion of combined annular cylinder

Analysis of the Influence of Textured Surfaces and Lubrication Conditions on the Tribological Performance between the Compression Ring and Cylinder Liner

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