Cavitation between cylinder-liner and piston-ring in a new designed optical IC engine

A new engine block with optical access has been designed and manufactured capable of running up to 3000 r/min the same specification as unmodified engine. The window allowed full length liner over a width 25 mm investigate lubricant flow cavitation at contact point between rings cylinder-liner. In addition, it good into combustion chamber allow charged flow, spray visualisation measurements using different methods. New custom management system build in LabView for precise control design was great success producing high quality images formation development speeds ranging from 208 temperatures (30°C–70°C) high-speed camera. results under motorised operation confirmed that there no points during intake/exhaust strokes due low in-cylinder presure, while compression/expansion strokes, pressure, considerable cavities were observed, particular, compression stroke. Lubricant had effect promoting both their intensity covered ring area 50°C expected. Beyond that, although increases further temperature, its reduces possible collapse cavitating bubbles higher temperature. change speed 800 increased considerably by 52% 19% 1000 r/min. After showed very small increase (1.3% 2000 r/min) similar distribution across ring.