Simulation of Scavenging Process in a Two-Stroke Gasoline Engine

Abstract:

Three-dimension transient numerical simulation of flow field in the transfer ports , exhaust port, intake port, crankcase and cylinder system of two-stroke gasoline engine was studied by using CFD software Fire, and the situations of airflow movement and exhaust gas distribution were presented dynamically in the scavenging process. The results show that flow field structure of the upper cylinder is mainly comprised of a pair of toroidal vortex and tumble vortex, while flow field structure of the lower cylinder is mainly comprised of four radial swirls and "short-circuiting" fuel losses. Along with the progress of scavenging process, the area of fresh charge and mixture increase while the exhaust gas area decreases accordingly. When the piston reaches to the BDC (bottom dead center), the exhaust gas area almost disappears.

• Periodical: Advanced Materials Research (Volumes 614-615)
• Pages: 376-380
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.614-615.376
• Online since: December 2012
• Authors: Chang Yuan Li, Dong Tang, Nan Li
• Keywords: Numerical Simulation, Scavenging Process, Two-Stroke Engine

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