Optimization of the surface texture on piston ring in four-stroke IC engine

Rajput, Harsha; Atulkar, Ashok; Porwal, Rajkumar

doi:10.1016/j.matpr.2020.09.752

Cited by 13 publications

(14 citation statements)

References 33 publications

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“…Results show that the oil film thickness varies obviously in the circumferential direction of the piston ring due to the special structural composition and differential velocity motion characteristic of the combined annular cylinder. The most sever wear zone could be estimated as wear zone (a), (d), corresponding to points M θM=96°and θM=354° respectively, where a focus of attention should be firstly attached for lubricant supply at those points and the texture technology 33,34 could be adopted to improve the wear resistance of the piston ring and the CAC wall on those specific areas. In addition, there are great difference of friction power loss as the oil film thickness varies at different points of the piston ring, especially between points M ( θM=6° and θM=354°) and the value of differences increases with the increasing of the output shaft speed, which will seriously affect the life of the piston ring.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…The K = L x /L z ratio is 0.1, to avoid the lateral boundaries effects on the maximum pressure calculation, by assuming that the lateral boundaries are very far from the area of study. The film thickness coefficient ξ = H 3 , where H has been defined using Equation (10). All border nodes have zero pressure, and any negative pressure is assumed to zero in this study, to avoid cavitation.…”

Section: Methodsmentioning

confidence: 99%

“…For example, a piston ring and a cylinder liner pair in an IC engine is a major source of oil consumption, and works under a mixed lubrication (ML) region. This part consumes half of the fuel energy needed to overcome the frictional losses [3]. Additionally, CO 2 emissions are proportional to energy consumption.…”

Section: Introductionmentioning

confidence: 99%

CFD Investigation of Reynolds Flow around a Solid Obstacle

et al. 2022

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The Reynolds equation defines the lubrication flow between the smooth contacting parts. However, it is questionable that the equation can accurately anticipate pressure behavior involving undeformed solid asperity interactions that can occur under severe operating conditions. Perhaps, the mathematical model is inaccurate and incomplete, or some HL (hydrodynamic lubrication) and EHL (elastohydrodynamic lubrication) assumptions are invalid in the mixed lubrication region. In addition, the asperity contact boundary conditions may not have been properly defined to address the issue. Such a situation motivated the recent study of a 3D CFD investigation of Reynolds flow around the solid obstacle modelled in between the converging wedge. The produced results have been compared to analytical and numerical results obtained by employing the Reynolds equation. The validated CFD simulation is compared with the identical wedge, with cylindrical asperity at the center. A significant increase in pressure has been predicted because of asperity contact. The current study shows that the mathematical formulation of the ML problem has shortcomings. This necessitates the development of a new model that can also include fluid flow around asperity contacts for the accurate prediction of generated pressure. Consequently, sustainable tribological solutions for extreme loading conditions can be devised to improve efficiency and component performance.

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“…Several studies are reported in the literature focusing on surface roughness effects on the functionality and lifespan of lubricated contact, and this topic is currently a priority for tribology industries [1][2][3][4]. A thorough assessment of the history of numerical simulation of the ML is well documented in the literature [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Lubricant-Solid Interface Using the Multigrid Method

Patel¹,

Khan²,

Bakolas³

et al. 2023

Preprint

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Solid asperity interactions are common and inevitable under severe loading conditions for any lubricated contact. Heavy-duty machine components (gear, bearings etc.) generally operate under Mixed Lubrication, where uneven surface features contact each other when generated fluid pressure is not enough to support the external load. The Reynolds equation is commonly used to simulate smooth lubricated contacts numerically. In rough lubricated interfaces where opposite surface asperities make contact, the Reynolds equation alone cannot accurately predict pressure using the traditional numerical simulation method. In this paper, Lubrication-Contact interface conditions (LCICs) have been implemented and extended to solve the multiple asperity contact problem using the full-multigrid approach. The developed novel algorithm has significantly accelerated the solution process and improved the accuracy and efficiency of pressure calculation for fluid-solid sub-interactions that can occur under ML regions. The Finite Difference Method (FDM) results have been compared with Computational Fluid Dynamics (CFD) simulation to validate the newly developed model. Hence, the proposed optimized solution method will provide valuable insight to researchers and industry engineers interested in simulating the ML problem where the effect of the fluid-solid interface can be captured effectively to improve reliability in the calculation of the life expectancy of the lubricated parts.

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Optimization of the surface texture on piston ring in four-stroke IC engine

Cited by 13 publications

References 33 publications

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

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

CFD Investigation of Reynolds Flow around a Solid Obstacle

Numerical Simulation of the Lubricant-Solid Interface Using the Multigrid Method

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