Analysis of the Tribology in the Piston Group Using an Optically Accessible Research Engine
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Daimler has set up an innovative optical research engine with sapphire windows inserted into the cylinder wall. These windows provide a view of the piston side faces throughout the stroke at virtually all operating points. Due to the use of laser-induced fluorescence, the distribution of the lubricating oil in the piston group can be visualised, thus providing new insights into the associated tribology.
Sealing Function Versus Friction
Special thanks go to Dr. Thomas Behr for his hard work in carrying out the project. The authors would also like to thank Professors Christof Schulz and Sebastian Kaiser from the Institute of Combustion and Gas Dynamics at the University of Duisburg-Essen for their many helpful insights when designing the optical system.