汽油机燃用汽油-含氧化合物混合燃料时的燃烧特性研究

Combustion Characteristics of Gasoline Engine Fed by Gasoline Oxygenate Blends

根据实测示功图，系统分析了汽油中分别掺混甲醇、乙醇、乙醚含氧燃料时的质量燃烧率和最高爆发压力．计算结果表明：与汽油相比，汽油中掺混乙醚可明显缩短着火延迟期和燃烧持续期，并提高缸内最高爆发压力；掺混醇类燃料的比例较小时，可缩短着火延迟期，并明显缩短燃烧持续期；掺混醇类燃料的比例较大时，将使着火延迟期和燃烧持续期增加；

Information for the recorded pressureis used to analyze the massfraction burned and maxi mum cylinder pressure when methanol,ethanoland ether are blended intothe gasoline .Calculated re sults show thattheignition delay and combustion duration of gasoline ether blends decreaseappreciably andthe maximum cylinder pressure increases when compared with gasoline . The ignition delay de creases and combustion duration reduces whenthefraction ofalcoholfuelsin gasolineissmall,whereas theignition delay and combustion duration increase when the fraction of alcohol fuels in gasoline is large.