期刊
ENERGY CONVERSION AND MANAGEMENT
卷 117, 期 -, 页码 115-131出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2016.03.035
关键词
Piston ring-pack; Mixed-hydrodynamics; Energy loss; Engine warm-up
资金
- National Research Foundation (NRF) of Korea
- Korean government (MEST) [2012R1A2A2A01046099]
- Priority Research Centers Program through the NRF
- MEST [2010-0020089]
A substantial amount of fuel energy is used to overcome internal friction of an engine. Power loss in piston ring-pack accounts for a major portion of this energy loss. Circumferential clearances caused by distorted bores alter the tribological behavior of the piston ring-liner (PRL) interface. This change in performance of the interface intensifies during warm-up of an engine. Mixed-hydrodynamic lubrication model is considered to evaluate the development of tribo-characteristics in piston ring-pack contact with a non-circular liner during the warm-up phase of a spark ignition (SI) engine. Variations in modes of energy loss caused by bore-distortion during the warm-up period are analyzed. Oil transport to the combustion chamber throughout the warm-up process is studied. Five different viscosity-grades are considered to compare performance of the interface. Results show that viscous shearing of lubricant oil is largely responsible for frictional loss in the warm-up phase. Circumferential variation in film thickness decrease parasitic losses in cold temperatures, but increases oil transport both in cold and in warm conditions. (c) 2016 Elsevier Ltd. All rights reserved.
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