燃油属性和环境密度对柴油机混合燃料喷雾的影响  

Influence of Fuel Property and Ambient Density on Spray of Fuel Blend

作　　者：安彦召[1,2] 黄豪中[1] 苏万华[2] 毛立伟[2] 梁源飞[1] 

机构地区：[1]广西大学机械工程学院,广西南宁530004 [2]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机学报》2013年第2期103-108,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(51076033)

摘　　要：应用平面激光诱导荧光(PLIF)技术研究了燃油属性、环境空气密度对石油系混合燃料喷雾特性的影响.结果表明:在蒸发环境下,燃料的挥发性越高,喷雾前锋贯穿距离越长,近、远场喷雾锥角越大;燃料的黏度越高,喷雾前锋贯穿距离越短;燃料密度越高,喷雾前锋贯穿距离变短;燃料的挥发性是影响喷雾特性的主要因素.在喷雾发展过程中,近场锥角呈先减小再保持在一个相对稳定的数值的趋势;远场喷雾锥角呈先减小然后保持不变之后再增大的趋势,但是全程远场喷雾锥角的变化不大.环境空气密度强烈影响混合燃料的喷雾特性,环境空气密度越高,喷雾前锋贯穿距离越短,近、远场喷雾锥角越大.随着环境空气密度的提高,燃料挥发性对混合燃料喷雾前锋贯穿距离和近、远场喷雾锥角的影响逐步减小.PLIF was used to study the influence of fuel property and ambient density on spray characteristics of fuel blend. Experimental results show that, in evaporating environment, high fuel volatility increases the spray penetration distance and spray cone angles （far field and near field）. High fuel viscosity decreases spray penetration distance. High fuel density decreases spray penetration distance. Volatility is main factor affecting spray characteristics. In the spray development, the near-field cone angle shows a decreasing and then keeping a fixed value behavior. Far-field cone angle shows a decreasing, keeping a fixed value and then increasing behavior. In general, the change in far-field spray angle is small. Ambient density directly affects the spray characteristics of fuel blend. Increase in ambient density decreases penetration distance and increases spray cone anzle.

关 键 词：柴油机 混合燃料 燃油属性 环境空气密度 喷雾特性 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]