摘要
采用Euler多相流模型、扩展的k-ε湍流模型和SIMPLE算法,基于Fluent软件对滑阀间隙密封内固液两相颗粒湍流进行了数值分析,分析了不同直径和体积浓度的污染颗粒对滑阀阀芯摩擦力的影响。研究结果表明:摩擦力随着颗粒体积浓度增大而近似线性增大;随着颗粒直径的变大,摩擦力先增大后减小,直径与间隙厚度很接近的颗粒即"敏感颗粒",会使阀芯表面产生最大的摩擦力,"敏感颗粒"直径为0.012 mm左右;在液压系统中采用合适尺度的过滤网或过滤芯将"敏感颗粒"附近尺寸的颗粒过滤掉以达到减小阀芯摩擦磨损,提高液压滑阀换向性能,进而提高整个液压系统的使用性能。
Solid-liquid two-phase particles turbulence in clearance seals of slide valves was numercially analyzed with using of Euler multiphase flow model,extended k-ε turbulence model and SIMPLE algorithm based on Fluent software. The effects of pollution particles with different diameters and volume concentrations on friction of slide valve core were anylased. The results show that the friction increases approximately in direct proportion to the particle volume concentrations. With the increasing of the diameters,the friction increases firstly and then decreases,the particles called'sensitive particles'cause the biggest friction,they have a diameter of 0. 012 mm which approximately equals to the thickness of the clearance. In hydraulic system,in order to reduce valve friction and wear,improve the performance of hydraulic slide valve and improve the application performance of the whole hydraulic system,a right size of the filter or filter core is adopted to filter out the particles with sizes near 'sensitive particles. '
出处
《机床与液压》
北大核心
2016年第1期134-139,共6页
Machine Tool & Hydraulics
基金
国家自然科学基金资助项目(51175306)
教育部新世纪优秀人才资助项目(NCET-11-0310)
泰山学者专项基金资助项目(TS201309229)
关键词
固液两相流
阀芯摩擦力
颗粒体积浓度
颗粒直径
Solid-fluid two-phase flow
Friction of valve core
Particle volume concentration
Particle diameter
