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Energy loss and emissions of engine compression rings with cylinder deactivation

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journal contribution
posted on 20.01.2021, 10:26 authored by Rob Turnbull, Nader DolatabadiNader Dolatabadi, Ramin RahmaniRamin Rahmani, Homer Rahnejat
A novel integrated multi-physics assessment of the piston top compression ring of an internal combustion engine under normal operation mode, as well as subjected to cylinder deactivation is carried out. The methodology comprises ring-liner thermo-mixed hydrodynamics, elastodynamics of ring, as well as combustion gas blow-by and emissions. Therefore, the analysis provides prediction of ring-liner contact’s energy losses and gas power leakage across the piston and ring crevices, as well as the resulting emissions. Cylinder deactivation (CDA) technology reduces the unburnt fuel entering the ring-pack crevices, as well as the emissions. It is also shown that the frictional and gas leakage power losses are exacerbated under CDA by as much as 20%. Although this is much lower than the potential gains in fuel usage when using CDA. The optimisation of the piston compression ring would provide further fuel efficiency and improved emissions, an issue which has not hitherto received the attention which it deserves. The in-depth analysis has also shown that CDA reduces the predicted CO, NOx and HC emissions by nearly as much as 8.5%, 10% and 8.7%, respectively.

Funding

Refinement of Engine in-cycle losses of Parasitic and Errant Dynamic Nature (Encyclopaedic)

Engineering and Physical Sciences Research Council

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EPSRC Centre for Doctoral Training in Embedded Intelligence

Engineering and Physical Sciences Research Council

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering

Volume

235

Issue

7

Pages

1930-1943

Publisher

SAGE Publications

Version

VoR (Version of Record)

Rights holder

© IMechE

Publisher statement

This is an Open Access Article. It is published by SAGE under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

16/11/2020

Publication date

2021-01-04

Copyright date

2020

ISSN

0954-4070

eISSN

2041-2991

Language

en

Depositor

Dr Ramin Rahmani. Deposit date: 18 January 2021