4.5 Article

Study on Engine Performance and Combustion System Optimization of a Poppet-Valve Two-Stroke Diesel Engine

Journal

ENERGIES
Volume 15, Issue 10, Pages -

Publisher

MDPI
DOI: 10.3390/en15103685

Keywords

poppet-valve two-stroke diesel engine; combustion system; combustion chamber profile; spray angle

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Funding

  1. National Natural Science Foundation of China [52176098]

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The study modified a four-stroke engine for two-stroke operation and optimized the combustion system, resulting in the same power output and better efficiency compared to the original engine. The findings suggest that the poppet-valve two-stroke engine is an effective technical approach for engine downsizing.
Two-stroke engines have higher power density than traditional four-stroke engines, and therefore are suitable for engine downsizing. In this work, a four-stroke single-cylinder diesel engine is modified for two-stroke operation, and the combustion system is designed and optimized using a 3D simulation. Three different combustion chamber profiles and injection spray angles are compared to determine an optimized combustion system. The engine test results show that the two-stroke engine equipped with the newly designed combustion system is able to achieve the same effective power output at a much lower speed than the original four-stroke engine, as well as obtain a better indicated thermal efficiency. This indicates that the poppet-valve two-stroke engine could be an effective technical approach for engine downsizing.

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