共轨喷油器喷油嘴压力室压力研究

Pressure Investigation on SAC Chamber of Nozzle in Common Rail System

本文对国外样品喷油嘴几何结构进行了详细分析,并且在AMEsim软件中建立了表达国外样品喷油嘴(正向密封座面角度差方案和反向密封座面角度差方案)的一维液力模型。重点研究如何提高某新一代高压力共轨喷油器的喷油嘴压力室压力。研究结果表明,喷油嘴采用反向密封座面角度差(针阀体角度大于针阀角度)方案,喷油嘴密封座面处的直径为1.5 mm,喷油嘴喷孔选用14孔0.19mm直径,能够使得喷油嘴密封座面处压力损失降低到5.7%,并且能够满足柴油机在1.2 ms实现220 mm3的喷油量的设计要求。

This paper investigated the different nozzles of foreign companies and established the corresponding models to cartT out 1D simulation. Studying how to increase the pressure of SAC chamber in the next generation of the high pressure common rail system. The results showed that the pressure loss in the seal area of the nozzle has been reduced to 5.7%. This nozzle has 1.5 mm of the seal diameter, 14 of the hole number, 0.19 mm of the hole diameter and the seal angle of the needle is less than that of the needle body. Meanwhile it ean meet the requirement of 220 mm3 of the injection quantity per cycle during the 1.2 ms injection period.