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Novel Approach to Analyzing Friction Losses by Modeling the Microflow of Lubricating Oil between the Piston Rings and Cylinder in Internal Combustion Engines

Author

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  • Piotr Wróblewski

    (Division of Aircraft Construction and Operation, Institute of Aviation Technology, Faculty of Mechatronics, Armament and Aerospace of the Military University of Technology, Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland
    Faculty of Engineering, University of Technology and Economics H. Chodkowska in Warsaw, Jutrzenki 135, 02-231 Warsaw, Poland)

  • Stanisław Kachel

    (Division of Aircraft Construction and Operation, Institute of Aviation Technology, Faculty of Mechatronics, Armament and Aerospace of the Military University of Technology, Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland)

Abstract

This work focuses on the evolution of lubrication wedge shaping in internal combustion piston engines, taking into account liquid microflows on curved surfaces and coating microgeometries. It introduces a new approach to the analysis of friction losses by simulating the microflow of lubricating oil between the surfaces of piston rings cooperating with the cylinder surface. The models used take into account three types of microgeometry and material expansion. Key results indicate that microirregularities with a stereometry of 0.1–0.2 µm significantly influence the distribution of oil film thickness in the phase of maximum working pressure, which is critical for the functioning of the seal ring. The innovation of the work consists of demonstrating that, despite small changes in the friction force and power in the piston rings, changes in the minimum values of the oil film thickness are significant. The work highlights the failure to take into account microgeometry parameters in friction models, which leads to significant errors in the simulation results, especially in terms of oil film continuity and the contribution of mixed friction. The simulations also indicate that advanced geometric models with high mesh resolution are necessary only for the assessment of changes in oil film thickness during the highest pressure increase in the combustion chamber and taking into account various mixed friction conditions. The results suggest significant progress in engine design and performance, confirming the importance of advanced fluid and mixed friction models in piston engine lubrication research.

Suggested Citation

  • Piotr Wróblewski & Stanisław Kachel, 2024. "Novel Approach to Analyzing Friction Losses by Modeling the Microflow of Lubricating Oil between the Piston Rings and Cylinder in Internal Combustion Engines," Energies, MDPI, vol. 17(15), pages 1-25, July.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:15:p:3697-:d:1443876
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    References listed on IDEAS

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    1. Nie, Wenjie & Liao, Qinghong & Zhang, ChunQiang & He, Jizhou, 2010. "Micro-/nanoscaled irreversible Otto engine cycle with friction loss and boundary effects and its performance characteristics," Energy, Elsevier, vol. 35(12), pages 4658-4662.
    2. Koszalka, Grzegorz & Hunicz, Jacek, 2021. "Comparative study of energy losses related to the ring pack operation in homogeneous charge compression ignition and spark ignition combustion," Energy, Elsevier, vol. 235(C).
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