电控单体泵控制阀开启过程的受力分析

Analysis of Force on Control Valve in Electronic Unit Pump

利用试验与仿真相结合的方法,研究分析了柴油机电控单体泵(EUP)燃油系统控制阀开启过程的受力特性。通过测量控制阀开启过程的位移获得了阀芯的受力情况;结合试验测得的进出口压力,利用计算流体动力学(CFD)方法对其流场进行了数值模拟。研究结果表明:阀开启过程末尾控制阀受到的合力方向指向闭阀方向,而燃油流动对阀芯的受力影响主要表现为液动力和静压力,其中液动力作用显著,且二者均阻碍阀打开;控制阀受力分析和结构优化必须充分考虑该区域流场的影响。

By means of experiment and simulation method, the force characteristic of the control valve in the electronic unit pump （EUP） is studied. The resultant force on the valve is obtained based on its dis- placement data acquired through test. The flow field is simulated with the computational fluid dynamics （CFD） method. The transient inlet and outlet pressure measured are adopted as the boundary of the CFD simulation. The experiment results show that the resultant force＇ s direction is consistent with that of the valve closing at the end of valve opening, the flow influence on the valve mainly reflects in the static pressure and flow force, especially in the flow force, and they both prevent the valve from opening. The flow characteristic around the valve must be fully taken into consideration for force analysis and structure optimization of the control valve.