What is it about?
Oil film thickness measurements in between and under the piston-rings in piston engines provide an insight of the lubrication that is very important to maintain its useful properties during engine operation. The stringent emissions regulations impose more efficient engine management and studying the tribological properties during the transient engine operation is mandatory for optimization of the piston-assembly operation.
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Why is it important?
Solid techniques that can be easily implemented in simplified test rigs, provide plenty of results that enable the researchers to reach safer conclusions than in engine operation. The lubricant can be formulated with new additives after thorough examination of its performance in oil film pressure, friction, cavitation and load support and give an insight of its behaviour in the harsh engine conditions. All major manufacturers have models that predict the piston-ring operation. Experiments provide the necessary supplemental information.
Perspectives
More parameters and lubricants can be tested and safer conclusion can be reached through the addition of temperature as a parameter. Through data analysis, the formulation of new additives can be examined and also the consideration of different lubricant systems so that the identified properties can be suited in the optimal manner to various lubricated engine components.
Dr. Polychronis Dellis
City University
Read the Original
This page is a summary of: Laser-induced fluorescence measurements in a single-ring test rig: Evidence of cavitation and the effect of different operating conditions and lubricants in cavitation patterns and initiation, International Journal of Engine Research, January 2019, SAGE Publications,
DOI: 10.1177/1468087418819254.
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