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An assessment of gas power leakage and frictional losses from the top compression ring of internal combustion engines

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journal contribution
posted on 02.10.2019 by Rob Turnbull, Nader Dolatabadi, Ramin Rahmani, Homer Rahnejat
A multi-physics integrated analysis of piston top compression ring of a high-performance internal combustion engines is presented. The effects of transient ring elastodynamics, thermal gas flow through piston crevices upon chamber leakage pressure and parasitic frictional losses are investigated. The multi-physics analysis comprises integrated flexible ring dynamics, ring-liner thermo-mixed hydrodynamics and gas blow-by, an approach not hitherto reported in literature. The predictions show close conformance to frictional measurements under engine motored dynamometric conditions. It is shown that power losses due to gas leakage can be as much as 6 times larger than frictional losses, which are usually considered as the main sources of inefficiency.

Funding

Engineering and Physical Sciences Research Council (EPSRC) for most of the research carried out under the Encyclopaedic Program grant (EP/G012334/1) and some under the Centre for Doctoral Training (EP/L014998/1) in Embedded Intelligence (CDT-EI).

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Tribology International

Volume

142

Publisher

Elsevier

Version

VoR (Version of Record)

Rights holder

© The Authors

Acceptance date

30/09/2019

Publication date

2019-10-01

Copyright date

2019

ISSN

0301-679X

Language

en

Depositor

Dr Ramin Rahmani

Article number

105991

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