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Numerical Study on Pressure Generation Mechanism of Oil Film under Oil Control Ring
Technical Paper
2019-01-2361
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
To reduce oil consumption in reciprocating engines, many studies have been conducted on the mechanism and control of the upward transport of oil from the sump to the combustion chamber through the gap between the cylinder liner and compression rings, which is the main cause of oil consumption. Our research group has previously conducted experiments and numerical analysis elucidating the behavior of oil around the piston skirt and oil ring that forms the entrance for the upward transport of oil and is important in optimizing the amount of oil. However, many uncertainties remain regarding the pressure generation mechanism of oil under the oil ring and clarification is essential to establish a high-accuracy prediction method for oil consumption. In the present study, we demonstrated the pressure generation mechanism of oil under the oil ring by reproducing the flow field in the gap between the liner and piston skirt/underside oil ring using computational fluid dynamics (CFD). CFD was conducted with a simplified geometric shape model assuming a viscous two-phase (oil-air) flow and the interface between the oil and air was calculated using the volume of fluid (VOF) method. Mainly, we discussed the influence of an oil film thickness, area size of circumferential direction φ and skirt length on behavior of the oil-air flow and the time-variation of the pressure under the oil control ring (OCR).
Authors
- Susumu Degawa - Graduate School of Integrative Science and Engineering, Toky
- Wataru Kobayashi - Graduate School of Integrative Science and Engineering, Toky
- Koji Kikuhara - Department of Mechanical Engineering, Tokyo City University
- Koichi Nishibe - Department of Mechanical Engineering, Tokyo City University
- Akemi Ito - Department of Mechanical Engineering, Tokyo City University
Citation
Degawa, S., Kobayashi, W., Kikuhara, K., Nishibe, K. et al., "Numerical Study on Pressure Generation Mechanism of Oil Film under Oil Control Ring," SAE Technical Paper 2019-01-2361, 2019, https://doi.org/10.4271/2019-01-2361.Data Sets - Support Documents
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References
- N. Iijima , S. Aoki , J. Imamura and M. Takiguchi 2009 An Experimental Study on Effect of Lower Tension Piston Rings on Piston Friction and Lubricating Oil Consumption Transactions of Society of Automotive Engineers of Japan 40 6 1477 1482
- A. Ito , H. Shirakawa , M. Nakamura , K. Yoshida and H. Akiyama 2005 A Study on the Mechanism of Lubricating Oil Consumption of Diesel Engines (First Report) : The Effect of the Design of Piston Skirt on Lubricating Oil Consumption SAE Brasil Fuels & Lubricants Meeting
- S. Furuhama , Y. Yoshitane and N. Nakamura 1962 A Study of the Oil Loss through the Piston Transactions of the Japan Society of Mechanical Engineers 28 193 1212 1223
- David P. Hoult 1994 The Puddle Theory of Oil Consumption Tribology Transactions 37 75 82
- M. Nakamura , A. Ito and H. Hayashi A Study on the Mechanism of Lubricating Oil Consumption of Diesel Engines (Second Report) : Mechanism of Oil Film Generation on Piston Skirt 2005 Transactions of Society of Automotive Engineers of Japan 36 4 99 104
- M. Nakamura , A. Ito and H. Hayashi A Study on the Mechanism of Lubricating Oil Consumption of Diesel Engines (Third Report) : Applying Two Phase Flow for the Oil Film Cavity Region on the Piston Skirt 2006 Transactions of Society of Automotive Engineers of Japan 37 4 181 186
- K. Kikuhara , H. Sekiya , A. Ito and H. Akamatsu A study on Numerical Analysis Model of the Oil Film under the Oil Control Ring Considering the Generation Mechanism of Oil Pressure 2017 Transactions of Society of Automotive Engineers of Japan 48 2 225 232
- K. Kikuhara , H. Sekiya , A. Ito and H. Hayashi A Numerical Analysis on the Effect of Several Factors on the Oil Pressure under Oil Control Ring Which Relates to Oil Consumption 2018 Transactions of Society of Automotive Engineers of Japan 49 2 282 289
- C. W. Hirt and B. D. Nichols Volume of Fluid (VOF) Method for the Dynamic of Free Boundaries 1981 Journal of Computational Physics 39 201 225
- ANSYS Fluent-Theory Guide Release 19.0 ANSYS, Inc. Canonsburg, PA 2018
- H. Hasegawa , K. Kikuhara , S. Nishijima , H. Suzuki , A. Ito , H. Sekiya A. Hirotaka and H. Akamatsu The Effect of the Position and Number of Oil Pressure Generating under the Oil Ring with Relation to Oil Consumption 2017 Transactions of Society of Automotive Engineers of Japan 48 1 5