高压油管对共轨系统性能影响的研究  

Numerical Study of Effects of Delivery Pipe on Performance of Common Rail System

作　　者：刘学龙[1] 苏万华[1] 战强[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机工程》2010年第5期47-51,57,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家"九七三"重点基础研究发展规划项目(2007CB210000)

摘　　要：归纳分析了高压共轨系统的数学模型,并选用FLOWMASTER建立了软件仿真模型。在发动机转速1 000 r/min、轨压110 MPa下,计算高压油管长度、直径、限流阀对系统性能的影响,并研究了小脉宽时的喷油特性。研究结果表明:系统内存在由喷油引起的压力波,高压油管长度为400 mm、直径3 mm时,系统阻力损失较小且响应迅速。流量限制阀有稳定管路压力波动的作用,小控制脉宽时平均喷油压力很低,控制脉宽为0.08 ms时,压力室压力小于3 MPa,不利于燃油雾化。The present numerical models of common rail system were analyzed,and the simulation model was established using the selected FLOWMASTER.The effects of delivery pipe length and inner diameter,restriction valve on system performance were calculated for engine speed 1 000 r/min and rail pressure 110 MPa,and the injection characteristics of small pulse width（SPW） injection were examined.The results show that every fuel injection may excite pressure waves in the system and under the conditions of delivery pipe length 400 mm and inner diameter 3 mm,the resistance loss is quite low and the system response is fast.In spite of the fact that the restricting valve causes some resistance loss,it can reduce amplitude of the pressure fluctuation in the system.During conducting SPW injection,the injection pressure becomes very low.When the injection pulse width is 0.08 ms,the fuel pressure in nozzle sac lowers to below 3 MPa,deteriorating fuel atomization.

关 键 词：内燃机 柴油机 共轨 喷油系统 仿真 

分 类 号：TK421.4[动力工程及工程热物理—动力机械及工程]