Frictional Losses of Ring Pack in SI and HCCI Engine

Grzegorz Koszalka () and Andrzej Wolff
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Grzegorz Koszalka: Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland
Andrzej Wolff: Faculty of Transport, Warsaw University of Technology, 00-662 Warsaw, Poland

Energies, 2023, vol. 16, issue 24, 1-17

Abstract: The vast majority of research dedicated to enhancing the homogenous charge compression ignition (HCCI) low-temperature combustion system is focused on improving controllability, efficiency and emissions. This article aims to assess the impact of HCCI combustion on the operation of the piston ring system. Utilizing the measured pressures in the combustion chamber of a single-cylinder research engine operating in spark ignition (SI) and HCCI modes at various loads, simulations were carried out using an advanced ring pack model. This model integrates the gas flow, ring dynamics and ring mixed lubrication models. Simulations revealed that differences in the pressure above the piston between the HCCI and SI combustion significantly influence ring pack performance. The predicted energy losses due to the friction of piston rings against the cylinder liner are up to 5% higher in the HCCI engine than in the SI engine. This identified drawback diminishes the advantages of the HCCI engine resulting from higher thermal efficiency, and efforts should be made to minimize this negative impact.

Keywords: energy efficiency; low-temperature combustion; piston ring; ring dynamics; hydrodynamic lubrication; mixed friction; blow-by (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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