A Scanning-LIF method for high-resolution quantitative measurement of the oil film thickness distribution around the piston of running engines and a method for two-dimensional measurement of oil film thickness have been developed. Using these methods, it is possible to understand lubrication Conditions on the sliding surface of the piston and the Phenomenon of oil loss via the piston ring. The methods can Also be used to gain an understanding for reducing piston friction And of the mechanisms of lubricant oil consumption.
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