乙醇体积分数对乙醇汽油蒸发性能的影响研究

Study on the Influence of Ethanol Content on Evaporation of Ethanol-Gasoline

考察了乙醇体积分数对乙醇汽油馏程及饱和蒸汽压的影响,对乙醇汽油的蒸发性进行了研究。乙醇体积分数低于15%的乙醇汽油,其馏出温度普遍降低、饱和蒸汽压升高,表明乙醇汽油具有良好的蒸发性,使发动机的启动性、加速性和稳定性等均优于普通汽油。但乙醇汽油良好的蒸发性也会导致汽油蒸发排放对环境造成污染,增加了供油系统产生气阻的可能性。10%乙醇汽油的蒸发性适中,对汽油蒸发排放及气阻的影响不大。

In order to study the evaporation of ethanol-gasoline, experimental investigation had been carried out on distillation range and saturated steam pressure with different ethanol content. When the volume fraction of ethanol was less than 15% ,the distillation temperature of ethanol-gasoline would decrease generally,and its saturated steam pressure would increase. Result showed that ethanol-gasoline had a favorable evaporability. The starting, acceleration and stability of engine with ethanol-gasoline were superior to those with regular gasoline. But its favorable evaporability would lead to the environmental pollution from evaporative emission of gasoline and increase the oil supply system to cause vapor lock or possibility. Due to the evaporation of 10% ethanol-gasoline was moderate,the evaporative emission of gasoline and vapor lock would not create a big impact.