增氧剂DMC对汽油理化特性及电控汽油机性能的影响

选用碳酸二甲酯(DMC)作为含氧燃料添加剂，分别按一定的体积比添加到90^#铅汽油中，分析其对汽油主要理化参数的影响规律．此外，在发动机试验台架上，考察了燃用不同掺混比的DMC／汽油混合燃料时，电控汽油机动力性能和经济性的变化．实验结果表明，DMC／汽油混合燃料的研究法辛烷值(RON)随着DMC添加量的增大而增加，当达到试验最大添加比例4．7％时，燃料的研究法辛烷值为93．3．混合燃料的雷德蒸气压有所降低，而馏程与基础油相比，基本保持不变．燃用DMC／汽油混合燃料，汽油机功率下降，燃油消耗率和能量消耗率上升．当达到最大添加比例4．7％时，汽油机功率下降最大值达到7．4％，相应的燃油消耗率和能量消耗率则分别上升11．4％和6．3％．

Effects of Dimethyl Carbonate on Physical and Chemical Properties of Gasoline and on the Performance of an EFI Gasoline Engine

The effects of dimethyl carbonate (DMC) as an oxygenate mixed into the 90~# unleaded gasoline on the physical and chemical properties of blended fuels and on the performances of an EFI gasoline engine were investigated. The results showed that the research octane number (RON) of blended fuels increased with the more DMC additives,and the RON reached to 93.3 with the max DMC content of the test fuels 4.7% v/v. The Reid vapor pressure had a little decrease, but there was no significant change on the distillation temperature compared with that of the 90~# unleaded gasoline. Addition of DMC into gasoline resulted in a decrease in the output power of EFI gasoline engine and in an increase in the brake specific fuel consumption(BSFC) and the brake specific energy consumption(BSEC).With the fuel containing 4.7% (v/v) DMC, highest concentration of additives among the test blends, the loss of engine output power was 7.4% and the BSFC and the BSEC were up to 11.4% and 6.3% respectively.