Abstract
This paper deals with a widely applicable simulation of the gas exchange process in a small two-stroke cycle gasoline engine. Theoretical result shown by the 1st report was compared with the experimental data obtained from pressure and gas analysis under various cylinder port heights and engine speeds. In this simulation, the diffusion factor εm in the scavenging passage, the mixing factor r in the scavenging passage or the crank case, and the mixing factor ψm and the short-circuit factor ψd in a cylinder, are taken as follows : For the exhaust lead of 0.026∼0.184 and the engine speed of 1000∼5000 rpm, 0 ≨ εm ≨ 0.08, 0r ≨ 0.35 (in the case of return-blow), 0 ≨ r ≨ 0.06 (in the case of blow-back), 0.7 ≨ ψm ≨ 1, 0 ≨ ψd ≨ 0.1. The optimum values of the scavenging efficiency and the charging efficiency are obtained at the exhaust lead of 0.096 and engine speed of 2800 rpm, εm=0. 01, r=0. 01 (in the case of return- blow), r=0 (in the case of blow-back), ψm= 0.85, ψd=0.
