Stark, M. and Mittler, R., "Optimization of Tribodynamic Effects to Improve the Reduction Potential of Particulate Matter Concentrations in the Exhaust Gas of Large Two Stroke Marine Diesel Engines," SAE Int. J. Fuels Lubr. 7(3):965-978, 2014, doi:10.4271/2014-01-2844.
Understanding tribodynamic effects is crucial when aiming to reduce lube oil consumption and related exhaust gas emissions. This report briefly describes the lubrication concept of large two stroke marine diesel engines and different contributors to the lube oil balance of such an engine.Addressing possible measures to influence the contribution of lubrication system parameters on exhaust gas emissions requires a detailed analysis of possible actions to achieve the expected improvement. Activities to enhance lubrication system performance concentrate on: Modifications of relevant engine componentsThe application of experimentally gained data to support computational simulation modelsThe application of suitable validation approachesThis report in particular highlights piston ring pack optimizations on basis of computational simulation. One major step in developing a new piston ring pack dynamic simulation tool was achieved by implementing two stroke engine specific measurement results of general engine performance data, as well as complex information of tribo- and gas-dynamic effects on piston ring motion and lube oil film.This report consequently describes experiments which were performed to validate piston ring pack performance in a full scale engine test and lead to improved understanding of tribodynamic effects.