高温高压条件下柴油的雾化蒸发特性  

Atomization and Evaporation Charactertistics of Diesel Fuel under High Temperature and Pressure

作　　者：李向荣[1] 薛继业[1] 万远亮 苏立旺[1] 何旭[1] 刘福水[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]东风商用车有限公司技术中心,湖北武汉430056

出　　处：《车用发动机》2016年第2期23-27,共5页Vehicle Engine

摘　　要：利用高速摄影和纹影法,在可变温度和压力的定容燃烧弹中,模拟发动机的实际运转工况,进行了不同喷油压力和背景压力条件下柴油的雾化蒸发特性试验研究,得出一系列热态喷雾图像。研究表明:喷油压力越高,雾注总的贯穿距离、锥角和投影面积越大,但液核的最大贯穿距离、锥角和投影面积变化不大,显著蒸发时刻不断提前,气相部分投影面积增大,混合均匀性改善;随着背景压力的升高,气、液相贯穿距离均下降,雾注总的喷雾锥角增大,雾注面积、液核面积减小。An experimental study of diesel atomization and evaporation characteristics under different injection and ambient pressures was carried out in a variable temperature and pressure constant volume vessel to simulate the actual operating conditions of an engine by using high-speed photography and schlieren method.A series of high-temperature spray images were acquired.The results showed that the penetration,cone angle and projection area of diesel spray column increased with the increase of injection pressure,but those of fuel liquid core hardly changed.In addition,the significant evaporation timing advanced,the gaseous projection area increased and the air-fuel mixing uniformity improved.With the increase of ambient pressure,the penetration and projection area of spray column and liquid core decreased,but the spray cone angle increased.

关 键 词：柴油 喷雾 蒸发特性 喷油压力 背景压力 

分 类 号：TK421.43[动力工程及工程热物理—动力机械及工程]