【作者】 李明海； 张晓琨； 崔洪江； 关颖；

【Author】 LI Ming-hai,ZHANG Xiao-kun , CUI Hong-jiang, GUAN-Ying (School of Traffic and Transportation, Dalian Jiaotong University, Dalian 116028,China)

【机构】 大连交通大学交通运输工程学院；

【摘要】 本文通过CFD(Computation Fluid Dynamic)软件FLUENT利用可压缩流体的三维湍流模型和无粘流动模型对改进前后喷油嘴内流场进行数值模拟。对比研究发现,90密封座面的压力损失小于60密封座面;随着喷射压力的提高喷油嘴流量系数有减小的趋势;喷孔倒角可以增大喷油嘴流量系数,同时可以减少高压喷射带来的压力损失。按照该设计生产的产品前不久在高强化中速机车柴油机上22万余公里的实际运用结果表明,该型针阀偶件大大减少了故障率,并且其工作可靠性、使用寿命有大幅度提高。更多还原

【Abstract】 The three-dimensional numerical simulation for the compressible flow inside the nozzle tip was processed by using CFD (Computation Fluid Dynamic) FLUENT software. The study showed that there is less pressure loss in seal seat surface with 90o anger compared with 60oanger; as the inject pressure become higher, the discharge coefficient of the nozzle become smaller; the discharge coefficient would become larger if the fillet of nozzle applied, which will help to reduce the pressure lose caused by high inject pressure. Through comparison of different structure of nozzle tip, a new approach to improve and to modify the nozzle tip structures under a higher injection pressure were proposed.更多还原