Analyzing viscoelastic effects in piston skirts EHL at small radial clearances in initial engine start up

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• 作者：Syed Adnan  ; Qasim  ; ;   ; ^{adnan_qasim@yahoo.com} ; Usman F.  ; Chaudhri ;   ; ^{usmanch75@yahoo.com} ; M. Afzaal  ; Malik ;   ; ^{drafzaalmalik@yahoo.com}
• 关键词：Non-Newtonian ; Piston EHL ; Viscoelasticity ; Initial engine start up
• 刊名：Tribology International
• 出版年：2012
• 出版时间：January 2012
• 年：2012
• 卷：45
• 期：1
• 页码：16-29
• 全文大小：2729 K

文摘

Non-Newtonian engine lubricant and EHL film enhance engine life at small clearance in normal engine operation. It is not so in initial engine startup. This study models 2-D Maxwell viscoelastic hydrodynamic and EHL of piston skirts in initial engine startup. The 2-D Reynolds equation and the inverse solution technique are used for EHL solutions. Numerical solutions predict viscoelastic effects on piston eccentricities, hydrodynamic pressures and EHL films at different small radial clearances. Results are compared with Newtonian model, which suggest that viscoelasticity is beneficial for skirts lubrication at small radial clearances. Outcomes optimize small radial clearance in initial engine startup.