摘要
柴油机喷嘴内部空穴流动是造成喷孔出口燃油初次雾化的重要原因之一,影响喷雾特性,进而影响柴油机的燃烧及排放性能。而实际柴油机喷油系统中的喷油压力往往存在波动,使得喷嘴内部空穴流动现象更为复杂。针对垂直多孔喷嘴,利用混合多相流空穴模型,进行了喷嘴内部气液两相瞬态流动的三维数值模拟,深入分析了不同频率及不同波形的入口压力波动对喷嘴内部流动空穴发展过程的影响。分析得出,空穴有其自己的时间和长度尺度。
The cavitating flow in diesel engine nozzle holes is an important factor affecting the primary spray break-up and the spray characteristics, which will eventually affect the combustion and emission. In the fuel injection system, the injection pressure is always fluctuant, which makes the cavitating flow in the nozzle more complicated. The three-dimension numerical simulation of two-phase transient cavitating flow in nozzle holes for a vertical multi-hole injector was carried out by using a mixed multi-phase cavitating flow model, and the effects of injection pressure fluctuation with different frequency, and wave shapes on the cavitation phenomena in nozzle holes were analyzed. It is concluded that the cavitation process has its own time and length scale.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2009年第1期64-68,共5页
Chinese Internal Combustion Engine Engineering
基金
国家自然科学基金资助项目(50806030
50576032)
关键词
内燃机
柴油机
喷嘴
压力波动
空穴
三维数值模拟
CFD分析
IC engine
diesel engine
nozzle
injection pressure fluctuation
cavitation
three-dimension numerical simulation
CFD analysis
