摘要
电控直喷系统由于其具有良好的燃油经济性、热效率、排放和冷起动性能,广泛应用于SI发动机。目前2-甲基呋喃(MF)被证明是一种优于乙醇的生物质替代燃料,且其与汽油掺混燃料的直喷喷雾特性研究的较少。本文中应用6孔喷油器采用高速纹影技术研究M20,M40和汽油在不同环境背压和燃油温度下的喷雾特性。喷雾参数包括喷雾贯穿距、喷雾锥角和喷雾面积。结果表明,存在闪急沸腾和非闪急沸腾两种喷雾形态。当闪沸发生时,随着MF掺比的增加,喷雾贯穿距增加。随着环境背压的降低,贯穿距先减小后增加。喷雾锥角较未闪沸时增加,喷雾面积随着MF掺比的增加而增加并且与燃油温度呈负相关。当没有发生闪沸时,随着MF掺比的增加,喷雾贯穿距减小。
Direct injection (DI) system has been commonly used in spark ignition engines for its good performance in fuel economy, combustion efficiency, emissions and cold-start. Currently,2-methylfuran (MF) has already been a more attractive biomass fuel because of its better performance than ethanol. However, there is little study on the DI spray characteristics of 2-MF-gasoline blends. In this paper, the spray characteristics of 2-methylfuran-gasoline blends M20 (20% volume fraction MF-gasoline blend fuel), M40 and pure gasoline from 6-hole DI injector are investigated under various ambient pressure and fuel temperature using high-speed schlieren photography. The spray parameters include spray penetration, spray cone angle and spray area. The results show that there are two different spray forms, flash boiling and non-flash boiling. When flash boiling occurs, the spray penetration increases with the increase of MF ratio. With the reduction of ambient pressure, the spray penetration decreases firstly and then increases. And the spray cone angle is greater than that without flash boiling. The spray area increases with the increase of MF ratio and the spray area is negatively correlated with the fuel temperature. When there is no flash boiling, with the increase of MF ratio, the spray penetration decreases.
作者
高东志
郭勇
王凤滨
付铁强
Gao Dongzhi;Guo Yong;Wang Fengbin;Fu Tieqiang(China Automotive Technology and Research Center Co., Ltd., Tianjin 300300)
出处
《汽车工程》
EI
CSCD
北大核心
2019年第2期126-132,共7页
Automotive Engineering
