低粘度液化燃油在油泵偶件环隙中泄漏的研究

Low viscosity-liquefied fuels leakage from the plunger pinion clearance of fuel pumps

针对低粘度液化燃油(如液化石油气、二甲醚等)在高压燃油泵柱塞偶件环形缝隙中存在较严重燃油泄漏的问题,提出了定量分析其燃油泄漏的数学模型与计算方法;以液化燃油二甲醚为例,运用有限元分析软件,对高压燃油泵柱塞的变形及其偶件配合面环带间隙中的燃油泄漏,进行了液固耦合计算分析,提出了解决低粘度液化燃油泄漏问题的技术措施.

The leakage was considered of dimethyl ether （DME） and liquefied petroleum gas （LPG） with much lower viscosities from high pressure fuel pumps. Mathematical model and computing method are presented to analyze quantitatively the effect of low viscosity liquefied fuel on leakage flow characteristics in the clearance between plunger and plunger sleeve. A fluid-solid coupling finite element analysis （FEA） model is developed by FEA software, ANSYS, to investigate the deformation of plunger pinion and the fuel leakage from the tolerance clearance of the fuel pump. Some suggestions are also given to solve fuel leakage from conventional pumps in,diesel engines fueled with much lower viscosity fuels.