柴油机喷射系统高压油路的流固耦合仿真

Fluid-structure Coupled Simulation Research on High Pressure Fluid Flow of Fuel Injection System in Diesel Engine

泵-管-嘴式喷油系统中喷油嘴与高压油管的结构参数决定燃油的喷雾质量,从而影响整个柴油机的燃烧状况。通过计算流体力学(CFD)理论,利用数值仿真方法建立了某385型高速直喷柴油机喷油系统的计算模型,对高压油管和喷油器油道的液力过程进行了流固耦合仿真,较为准确地模拟了燃油在油道内的流动过程,分析了油管长度对喷雾特性的影响,进而确定了合适的高压油管几何尺寸,为后期的柴油机燃油喷射系统的研究提供理论依据。

The quality of fuel spray is decided by the structure of nozzle and high-pressure fuel pipe in the pump-tube-nozzle fuel injection system, and it influences the whole diesel combustion. By using computational fluid dynamic （CFD） theoretical and numerical simulation method, the calculation model of a certain type 385 diesel engine was set up, and simulation analysis of fluid flow process in the fuel injector and high-pressure fuel pipe was performed with fluid structure interaction （FSI） technique. The influence of the length of high-pressure fuel pipe was analyzed by means of convenient and facile computational simulation method, and the geometry parameter was confirmed. The research provided theoretical evidence for the subsequent research of diesel fuel injection system.