【作者】 孔令兴； 魏巍； 闫清东；

【Author】 Kong Ling-xing;Wei Wei;Yan Qing-dong;National Key Laboratory of Vehicular Transmission, Beijing Institute of Technology;Collaborative Innovation Center of Electric Vehicles in Beijing;

【机构】 北京理工大学车辆传动国家重点实验室； 北京电动车辆协同创新中心；

【摘要】 针对阀座带锥面、阀芯底面为平面型式的大流量二通插装阀,首先通过理论分析,明确了其液动力计算公式的特点以及与平底阀座锥阀的不同。在此基础上建立了插装阀内流场三维仿真模型,进行了稳态工况下的仿真计算,利用仿真结果对稳态液动力计算公式进行了完善和修正;在稳态流场仿真的基础上,利用profile定义阀芯运动速度,结合网格光顺与重画技术,进行了阀芯不同速度定速运动工况的瞬态流场仿真,结果表明阀芯所受瞬态液动力的方向与阀芯运动速度方向相反,大小与运动速度呈正比,符合阻尼力的特征;最后基于离散的牛顿第二定律编写了阀芯运动过程速度控制UDF,进行了阀芯实际受力情况下的瞬态流场仿真,结果表明阀芯位移的响应呈现阻尼振荡响应的特点,验证了瞬态液动力的阻尼特性。更多还原

【Abstract】 For cartridge valves with conical seat and plane spool, unique properties of formula used to calculate flow force was analyzed through theoretical analysis. 3D flow field model inside cartridge valve was constructed and meshed to conduct steady-state flow simulation. Simulation results was implemented to amend the calculation formula. Based on steady simulation results, transient flow field simulation was conducted by defining different velocity in profile to control the smoothing and remeshing of the fluid field. Simulation results showed that dynamic flow force acts in reverse to the velocity of the spool, and its magnitude was proportional to velocity. This means that the dynamic flow force behaves like a damper in the response of the spool. Finally,UDF(user defined function) derived from discrete Newton’s second law was used to control movement of the spool and simulate the actual transient fluid field condition. The response of spool displacement presented a characteristic of damped vibration, which confirmed the damper effect of transient flow force.更多还原