A Numerical Model to Study the Role of Surface Textures at Top Dead Center Reversal in the Piston Ring to Cylinder Liner Contact

被引:45
作者
Morris, N. [1 ]
Rahmani, R. [1 ]
Rahnejat, H. [1 ]
King, P. D. [1 ]
Howell-Smith, S. [2 ]
机构
[1] Univ Loughborough, Wolfson Sch Mech & Mfg Engn, Loughborough LE11 3TU, Leics, England
[2] Capricorn Automot Ltd, Basingstoke RG24 8AH, Hants, England
来源
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME | 2016年 / 138卷 / 02期
基金
英国工程与自然科学研究理事会;
关键词
internal combustion engine; surface texture; piston ring; friction; lubrication; MIXED LUBRICATION REGIME; ELASTOHYDRODYNAMIC LUBRICATION; TRIBOLOGICAL PERFORMANCE; FRICTION; CONJUNCTION; OPTIMIZATION;
D O I
10.1115/1.4031780
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Minimization of parasitic losses in the internal combustion (IC) engine is essential for improved fuel efficiency and reduced emissions. Surface texturing has emerged as a method palliating these losses in instances where thin lubricant films lead to mixed or boundary regimes of lubrication. Such thin films are prevalent in contact of compression ring to cylinder liner at piston motion reversals because of momentary cessation of entraining motion. The paper provides combined solution of Reynolds equation, boundary interactions, and a gas flow model to predict the tribological conditions, particularly at piston reversals. This model is then validated against measurements using a floating liner for determination of in situ friction of an engine under motored condition. Very good agreement is obtained. The validated model is then used to ascertain the effect of surface texturing of the liner surface during reversals. Therefore, the paper is a combined study of numerical predictions and the effect of surface texturing. The predictions show that some marginal gains in engine performance can be expected with laser textured chevron features of shallow depth under certain operating conditions.
引用
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页数:11
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