Isothermal transient analysis of piston skirt-to-cylinder wall contacts under combined axial, lateral and tilting motion

2005 ◽  
Vol 38 (5) ◽  
pp. 787-799 ◽  
Author(s):  
S Balakrishnan ◽  
H Rahnejat
Keyword(s):  
Transient Analysis ◽  
Cylinder Wall ◽  
Piston Skirt

The Effects of Piston Skirt Profiles on Secondary Motion and Friction

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Ozgur Gunelsu ◽  
Ozgen Akalin
Keyword(s):  
Power Loss ◽  
Radius Of Curvature ◽  
Cylinder Wall ◽  
Lateral Movement ◽  
Dynamics Model ◽  
Piston Skirt ◽  
Normal Forces ◽  
Oval Form ◽  
Secondary Motion ◽  
Frictional Performance

Piston skirt form deviating from a perfect cylinder is investigated numerically for an improved frictional performance. Three features defining the barrel and oval form of the skirt are compared in the search for lower friction power loss. Radius of curvature around the bulge of the barrel is changed to obtain a flatter or more-rounded lubricated area with respect to a hot-piston profile as well as the axial location of this bulge. On the other hand, the circumferential variation in the separation between the skirt and cylinder wall is represented by an elliptical piston and the aspect ratio is varied for comparison. These different skirt profiles are used in a developed piston secondary dynamics model solving for the lateral movement of the piston by calculating the hydrodynamic and boundary normal forces acting on the piston together with friction. Finally, an improved skirt profile is suggested to obtain better frictional efficiency.

A study of the secondary piston motion arising from changes in the piston skirt profile using a simplified piston skirt model

2012 ◽  
Vol 227 (1) ◽  
pp. 38-47 ◽  
Author(s):  
PD McFadden ◽  
SR Turnbull
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Lubricant Film ◽  
Maximum Diameter ◽  
Cylinder Wall ◽  
Centre Of Mass ◽  
Piston Motion ◽  
Piston Skirt ◽  
Secondary Motion

An existing model of the interface between a parallel-sided piston skirt and the cylinder wall in an internal combustion engine is extended to allow the modelling of barrelling of the piston skirt. The effects of the skirt profile on the secondary motion of the piston and on the distribution of pressure in the lubricant film are examined. It is shown that piston secondary motion, and in particular rotation of the piston about the gudgeon pin, which might contribute to wear of the cylinder, can be reduced by appropriate positioning of the maximum diameter of the piston skirt in relation to the gudgeon pin and the centre of mass of the piston.

TRANSIENT ANALYSIS OF HEAT TRANSFER IN PARALLEL SQUARED CHANNELS FOR HIGH TEMPERATURE THERMAL STORAGE

2015 ◽  
Vol 7 (5-6) ◽  
pp. 477-489 ◽  
Author(s):  
Assunta Andreozzi ◽  
Bernardo Buonomo ◽  
Oronzio Manca ◽  
Salvatore Tamburrino
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Transient Analysis ◽  
Thermal Storage
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