Abstract
A numerical model of the main processes occurring in a two-stroke internal combustion engine is described. This model does not have many of the restrictions of previous models in the literature. Particular attention is given to modelling the duct flows using a flux conservative Lax-Wendroff type algorithm modified by the use of flux splitting and flux limiters. This makes the model well able to cope with very high specific power output engines. Numerical, convergence, and flux conservation properties of the model are illustrated and engine performances predicted by it are shown to compare well with experimental data from a high performance 125cc engine and a medium performance 100cc engine.
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