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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University of Kragujevac
2013-12-01
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Series: | Tribology in Industry |
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Online Access: | http://www.tribology.fink.rs/journals/2013/2013-4/12.pdf |
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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 |
work_keys_str_mv |
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