Abstract
In rotating cylinder-piston system, the largest losses source is frictional losses, accounting for 50% of the total frictional losses, thus it is important to optimize. Effect of incremental rotation of a cylinder liner on its wear rate was investigated. The engine speed, load and the cylinder rotating angle were the main parameter. The results showed that the wear rate may be reduced to the half simply by rotating cylinder liner every six hours’ time interval of working. The test was carried out in pairs using a piston cylinder with movable liner and compared to a standard cylinder liner (fixed liner). Angles of 60o, 120o, 180o, 240o, and 300o were used for incremental movement. The same operating conditions for two cylinders were maintained for the purpose of comparison. Beneficial effects of reducing the wear rate for all components of the piston-cylinder arrangement associated with incremental rotational movement of a cylinder linear were noticed. A decrease in wear rate was obvious in the cylinder liner in rotation angles of 120o and 240o and it is almost one-fourth of the wear that occurs in the stationary cylinder liner.
Highlights
Energy affects substantially our modern life which governed by fuel depletion
A high wear rate with sinusoidal trend was observed for the case where the stationary cylinder was considered
Vibration modes depend on the engine speed and its harshness reflected on the wear rate curves as the engine speed varies
Summary
Energy affects substantially our modern life which governed by fuel depletion. This compels researchers and automotive industry in addition to the high market competition toward enhancing engine performance and leads to significant thermal and mechanical tensions on piston and cylinder design.Wear is taking place between any two solid surfaces in contact and have relative motion to each other; cylinder bore of an internal combustion engine is subjected to an excessive wear that may affect the engine performance and efficiency due to high relative velocity associated with high working temperature and pressure environment. Energy affects substantially our modern life which governed by fuel depletion This compels researchers and automotive industry in addition to the high market competition toward enhancing engine performance and leads to significant thermal and mechanical tensions on piston and cylinder design. Sealing function is strongly affected by lubrication scheme and wears condition, engine operating life will be affected In such case, the key role would be the original design tolerances. Modern design based on stronger and lighter materials, lesser clearances and enhanced designs are the key features of efficient engines Once the power stroke stars, the combustion pressure forcing the piston rings to the liner surface is at its highest; the surface temperature of the linear is high (about 200 C) and affecting lubricating oil in reducing its viscosity [2]
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