Abstract
The following study presents typical cylinder deformations that come up during engine assembly and operation and provides results of analysis of how these changes affect the operation of the compression ring. Special attention has been paid to the effect of cylinder diameter increase on the distribution of the circumferential wall pressure and the cause of light gaps formation has been explained. The analyses presented in the following paper have been carried out using a computer program that has been formulated based on a compression ring mathematical model. Exemplary results of simulation have been obtained for a medium speed generator engine of a cylinder diameter of 0.48 m.
Highlights
Even minor deformations of cylinder wall can cause a loss of light-tightness between the ring face and the cylinder liner influencing the tightness of the combustion chamber, deterioration of the engine parameters and increase in the wear of piston-cylinder assembly elements
The research on the phenomena accompanying the ring operation on a running IC engine shows that the ring wall pressure caused by the gas pressure sometimes distinctly exceeds the pressure connected with the ring’s own elasticity
This means that momentary distributions of ring wall pressure could differ considerably from those presented in this paper
Summary
Even minor deformations of cylinder wall can cause a loss of light-tightness between the ring face and the cylinder liner influencing the tightness of the combustion chamber, deterioration of the engine parameters and increase in the wear of piston-cylinder assembly elements. A typical profile of the liner (Fig. 2a) shows that its maximal wear occurs at the liner upper part where the first compression ring contacts the cylinder wall when the piston moves close to the TDC. This can be explained by the effect of high temperature and high wall pressure (curves of wear are very similar to the curves of temperature and pressure). Precise measurements of the cylinders show that this wear is more complicated, which could not be explained directly by the phenomena described by the hydrodynamic theory of lubrication
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