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Simulation Study on the Use of Argon Mixtures in the Pressurized Motored Engine for Friction Determination
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 27, 2020 by SAE International in United States
Mechanical friction and heat transfer in internal combustion engines are two highly researched topics, due to their importance on the mechanical and thermal efficiencies of the engine. Despite the research efforts that were done throughout the years on both these subjects, engine modeling is still somewhat limited by the use of models which do not fully represent the phenomena happening in the engine. Developing new models require experimental data which is accurate, repeatable and which covers wide range of operation. In 2018-01-0121, the conventional pressurised motored method was investigated, and compared with other friction determination methods. The pressurised motored method proved to offer a good intermediate between the motored tests, which offer good repeatability, and the fired tests which provide the real operating conditions, but lacks repeatability and accuracy. In 2019-01-0930, Argon was used in place of air in the experimental setup which resulted in bulk gas temperatures synonymous to the fired engine. In 2019-24-0141 and 2020-01-1063 mixtures between air and Argon were utilized to investigate the relationship of mechanical friction with a gradual increase in the bulk in-cylinder temperature. In this proposal for publication, a one-dimensional engine model is developed to assess the capability of a model to capture the effects on the engine imposed by changing the working gas. From the experimental studies on the pressurised motored engine, increasing the proportion of Argon to air showed an increase in the peak bulk gas temperature of around 600 . This resulted in no measureable difference in the mechanical friction, a large increase in the heat losses, and a decrease in the pumping losses. The engine simulation model in this work was found to be unable to deduce any conclusions on the friction due to the underlying model; however useful deduction on the heat transfer and pumping losses can be made.