燃油温度对喷雾特性的影响研究  

Effects of Fuel Temperature on Spray Characteristics

作　　者：佘金平[1] 张煜盛 张辉亚[1] 闫妍[1] 徐波[1] 

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《内燃机工程》2011年第5期37-43,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家重点基础研究发展规划项目(2007CB210001);高等学校博士学科点专项科研基金项目(20100142110081);国家自然科学基金项目(20777023);中央高校基本科研业务费资助项目(2010MS073)

摘　　要：以KIVA-3V为基础,研究了在定容室喷雾条件下,燃油温度对喷雾气液相贯穿距、气相总体积及气相混合气燃空当量比分布的影响。研究结果表明:随着燃油温度的升高,喷雾的液相及气相贯穿距缩短,蒸发喷雾在径向上的扩展明显增强,喷雾蒸发的气相体积几乎呈线性增加;在燃油温度为293K时,喷雾中气相混合气燃空当量比小于1的油气质量占所蒸发总油气质量的90%以上,而燃空当量比大于2的油气质量近乎为零;但当燃油温度达530K时,喷雾中气相混合气燃空当量比大于2的油气质量约占所蒸发油气总质量的70%。Effects of preheated fuel temperature on liquid/vapor spray tip penetration,total vapor volume and fuel/air ratio distribution in vapor phase mixture were investigated in a constant volume chamber by using CFD code KIVA-3V.It is found that as fuel temperature increases,both penetrations of liquid/vapor phase sprays decrease,vapor phase spray development in diameter direction intensifies and the maximum fuel/air ratio of vapor phase spray increases almost linearly.At fuel temperature of 293K,the mass fraction of fuel vapor with fuel/air ratio less than 1.0 amounts to more 90% of the whole evaporated fuel and that of with fuel/air ratio more than 2.0 approximates 0,while at 530K,the mass fraction of fuel vapor with fuel/air ratio more than 2.0 increases to about 70% of the whole evaporated fuel.

关 键 词：内燃机 正庚烷 燃油温度 蒸发 贯穿距 索特平均直径 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]