Modelling the Rough Piston Skirts EHL at a Small and a Large Radial Clearance in the Initial Engine Start Up

At initial engine start-up, the low speeds take time to develop considerable film thickness between piston and liner surfaces. Factors like radial clearance, oil viscosity and roughness of interacting surfaces play an important role in this regard. A two dimensional model is presented for hydrodynam...

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Main Authors: M. Gulzar, S.A. Qasim, R.A. Mufti
Format: Article
Language:English
Published: University of Kragujevac 2013-12-01
Series:Tribology in Industry
Subjects:
Online Access:http://www.tribology.fink.rs/journals/2013/2013-4/12.pdf
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spelling doaj-5b61138132ec4ea9b3297914768e1f4f2020-11-24T23:42:30ZengUniversity of KragujevacTribology in Industry0354-89962217-79652013-12-01354351357Modelling the Rough Piston Skirts EHL at a Small and a Large Radial Clearance in the Initial Engine Start UpM. Gulzar0S.A. Qasim1R.A. Mufti2College of Electrical and Mechanical Engineering, National University of Sciences and Technology (NUST), PakistanCollege of Electrical and Mechanical Engineering, National University of Sciences and Technology (NUST), PakistanSchool of Mechanical and Manufacturing Engineering, National University of Sciences and Technology (NUST), PakistanAt initial engine start-up, the low speeds take time to develop considerable film thickness between piston and liner surfaces. Factors like radial clearance, oil viscosity and roughness of interacting surfaces play an important role in this regard. A two dimensional model is presented for hydrodynamic lubrication and EHL of rough piston skirt under isothermal conditions. Flow factors method is used to incorporate the deterministic isotropic roughness effects in Reynolds’ equation and Greenwood-Tripp asperity contact model is used for involving the corresponding asperity contact forces and moments. The numerical model is used to get simulation results including piston eccentric displacements, hydrodynamic and EHL film thickness and rising pressures for 10 micron and 100 micron radial clearance between piston and liner. All results are plotted against 720 degree crank rotation cycle. The results show considerable change in each parameter by changing radial clearance from small value to large.http://www.tribology.fink.rs/journals/2013/2013-4/12.pdfElastohydrodynamicPiston skirtFlow factorInitial engine start-upAsperity
collection DOAJ
language English
format Article
sources DOAJ
author M. Gulzar
S.A. Qasim
R.A. Mufti
spellingShingle M. Gulzar
S.A. Qasim
R.A. Mufti
Modelling the Rough Piston Skirts EHL at a Small and a Large Radial Clearance in the Initial Engine Start Up
Tribology in Industry
Elastohydrodynamic
Piston skirt
Flow factor
Initial engine start-up
Asperity
author_facet M. Gulzar
S.A. Qasim
R.A. Mufti
author_sort M. Gulzar
title Modelling the Rough Piston Skirts EHL at a Small and a Large Radial Clearance in the Initial Engine Start Up
title_short Modelling the Rough Piston Skirts EHL at a Small and a Large Radial Clearance in the Initial Engine Start Up
title_full Modelling the Rough Piston Skirts EHL at a Small and a Large Radial Clearance in the Initial Engine Start Up
title_fullStr Modelling the Rough Piston Skirts EHL at a Small and a Large Radial Clearance in the Initial Engine Start Up
title_full_unstemmed Modelling the Rough Piston Skirts EHL at a Small and a Large Radial Clearance in the Initial Engine Start Up
title_sort modelling the rough piston skirts ehl at a small and a large radial clearance in the initial engine start up
publisher University of Kragujevac
series Tribology in Industry
issn 0354-8996
2217-7965
publishDate 2013-12-01
description At initial engine start-up, the low speeds take time to develop considerable film thickness between piston and liner surfaces. Factors like radial clearance, oil viscosity and roughness of interacting surfaces play an important role in this regard. A two dimensional model is presented for hydrodynamic lubrication and EHL of rough piston skirt under isothermal conditions. Flow factors method is used to incorporate the deterministic isotropic roughness effects in Reynolds’ equation and Greenwood-Tripp asperity contact model is used for involving the corresponding asperity contact forces and moments. The numerical model is used to get simulation results including piston eccentric displacements, hydrodynamic and EHL film thickness and rising pressures for 10 micron and 100 micron radial clearance between piston and liner. All results are plotted against 720 degree crank rotation cycle. The results show considerable change in each parameter by changing radial clearance from small value to large.
topic Elastohydrodynamic
Piston skirt
Flow factor
Initial engine start-up
Asperity
url http://www.tribology.fink.rs/journals/2013/2013-4/12.pdf
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AT ramufti modellingtheroughpistonskirtsehlatasmallandalargeradialclearanceintheinitialenginestartup
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