汽油喷射稀薄混合气的燃烧

Lean Mixture Combustion in a Fuel Injection SI Engine

本文研究了汽油喷射发动机稀薄混合气燃烧具有重要意义的空燃比、涡流强度、点火时刻、排气再循环和喷油定时等参数对油耗率和循环波动率的影响，并与化油器供油的发动机作对比分析。结果表明，汽油喷射可燃用更稀薄的混合气，指出在影响汽油喷射燃烧的三个主要因素中，以涡流的影响最大，空燃比次之，喷油定时在上止点前５０°ＣＡ到后１０°ＣＡ之间时对燃烧的影响相对较小。

In this paper, compared with the performance of carburetor engine, the effects of air fuel ratio,swirl ratio, ignition timing, EGR and fuel injection timing, which are most important in fuel injection SI engine, on fuel consumption and cyclic variation are studied. The results indicate that fuel injection engine with suitable stratified charge can run on leaner mixture. Among the three most important factors in fuel injection engine, swirl has the greateat effect, air-fuel ratio next and the fuel injection timing, within 50°BTDC to 10°ATDC, has the least effect.