Model Tests Of Piston Ring-Cylinder Liner Collaboration On High Power Engines

Proper selection of materials for cylinder liner and piston rings, correct design of collaborating surfaces as well as the use of lubricating oils of better and better properties assure long and reliable operation of piston rings in small and medium size engines. In the case of high power engines, especially marine ones failures caused by incorrect collaboration of rings and liner still happen. Supply and correct distribution of lubricating oil over cylinder surface could be one of the causes of this phenomenon. Regulations introduced by classification societies make impossible research on piston ring – cylinder liner set of running engines. Mathematical models or simulation test benches are the possible way of carrying out such tests. This paper presents some test rigs and analytical models revealing their advantages and shortcomings.