Research on extended expansion engine was carried out in order to enhance thermal efficiency in general purpose engines. A four-jointed linkage was used between the connecting rod and the crank pin of a standard piston-crank system and provides an Atkinson thermo dynamic cycle.Thermal efficiency of an engine with a compression ratio of 12.4 and an expansion ratio of 18.1 was compared to an engine with a compression ratio of 9.4 and an expansion ratio of 13.6.Measured indicated thermal efficiency of prototyped engine operated by natural gas was 38.7%, a 2.6% increase, as predicted in the numerical simulation.
Research on Extended Expansion General-Purpose Engine-Efficiency Enhancement by Natural Gas Operation-
Sae Technical Papers
Small Engine Technology Conference & Exposition ; 2010
2010-09-28
Conference paper
English
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