中文摘要：

提出一种通过加热高压油管内的柴油来降低柴油机冷起动排放和改善冷起动性能的方法.以某柴油机工作时,实测的高压油管嘴端与泵端的压力作为边界条件,建立高压油管内柴油的加热模型.运用计算流体动力学软件进行非稳态的传热数值仿真,得到油管内的温度场分布和燃油加热效果.仿真结果表明,在合适加热长度和加热温度下,可以有效提高高压油管内的柴油温度;加热长度的增加可以防止温度产生较大的波动.

英文摘要：

In order to improve the cold starting and emissions of engine,a new way which utilized the heating elements to preheat diesel fuel in the high-pressure tube was given.A heating model of high-pressure tube was brought forward,and the pressure of tube measured at a Diesel engine as the computational boundary condition.The unsteady heat transfer was simulated using the computational fluid dynamics by the temperature field and heating effect.Simulation results show that the diesel fuel temperature could improve by the right heating size and temperature in the high-pressure tube.And the longer heating length can prevent drastic fluctuations of the temperature.