摘要
应用多普勒粒子动态分析仪(PDA)研究了SCR系统尿素溶液喷雾的粒径及其分布特征。试验对比了有、无空气辅助喷射系统的喷雾粒径分布特征;测量了空气辅助喷射系统尿素溶液喷雾在垂直喷雾轴线不同截面上的粒径分布;研究了空气压力及喷嘴的喷孔结构对喷雾粒径的影响。通过高速摄影得到空气辅助喷射系统尿素溶液喷雾的发展过程。试验结果表明:空气辅助喷射系统沿喷雾轴向喷雾粒径的大小及粒径分布变化不大,大直径液滴所占比例随着辅助空气压力的减小而增大,有倒角喷孔较无倒角喷孔更有利于喷雾雾化;无空气辅助喷射系统喷雾雾化效果较差,大直径液滴所占的比例明显增大。
Droplet size distribution of urea solution spray in SCR system was measured using PDA. Spray characteristics of air assisted and airless urea injection systems were investigated and compared. For the former, its droplet Size distribution along the spray axis was measured and effect of assist air pressure and the injection orifice structure on spray atomization was studied. The spray developing process of air assisted urea injection system was investigated through high speed photography method. Experiment results indicate that the droplet size distribution is almost the same along the spray axis; the percentage of the large size droplet of the spray increases with assist air pressure decreasing; Chamfer of the orifice is helpful to spray atomization; spray atomization of the air assisted system is better than that of the airless system.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2012年第4期22-27,共6页
Chinese Internal Combustion Engine Engineering
关键词
内燃机
柴油机
选择催化还原
尿素
喷雾
多普勒粒子动态分析仪
IC engine
diesel engine
selective catalytic reduction（SCR）
ureaspray
phase Doppler analyzer（PDA）
