BQ型柱塞油泵内二甲醚柴油混合燃料的气阻仿真

为研究二甲醚/柴油混合燃料在燃料供给系统内气阻的产生机理和影响因素,依据BQ型柱塞油泵建模,运用Fluent软件分析油泵凸轮不同转速下,以及进油阶段不同泵内初始压力和不同进油压力条件下油泵内的流体分布情况。分析表明:混合燃料中DME含量越高,气阻现象越明显;改变凸轮型线,增加柱塞在密闭泵腔阶段下行的速度,有利于减少泵内液态DME的气化,降低进油开始时泵内的初始压力,进油时泵内初始压力越低,进油压力越高,越有利于泵内气态DME的重新液化,避免进油受阻现象的发生。

Simulation Study on Gas Resistance of DME-Diesel Dual Fuel inBQ Type Plunger Pumps

To study the form mechanism and influence factors of gas resistance produced in the fuel supply system by DME-diesel mixture, the model was built according to BQ type plunger pump. Fluent software was employed to analyze the fluid distribution in the pump under different cam rotation speeds and under different initial pressures and inlet pressures. Analysis show that the higher the DME content in the fuel blends, the more obvious gas resistance phenomenon is. Changing the cam contour line and increasing the plunger speed in the airtight stage downward is helpful to reduce the vaporization of DME in the pump,and decrease the initial pressure inside the pump at the beginning. The lower the initial pressure is, the higher inlet pressure would be, the more conducive for the gaseous DME to go back to liquid state, thus could avoid the phenomenon of inlet fuel hindered.