柱塞式液压缸内流场数值研究  

Numerical Research on Internal Flow Field of Plunger Hydraulic Cylinder

作　　者：张瑞 胡天威 杨晋[2] 

机构地区：[1]兰州兰石能源装备工程研究院有限公司,甘肃兰州730050 [2]兰州交通大学机电工程学院,甘肃兰州730070

出　　处：《液压气动与密封》2015年第11期9-13,共5页Hydraulics Pneumatics & Seals

基　　金：国家自然科学基金项目(51265022);国家科技支撑计划项目(2007BAF28B01);甘肃省科技重大专项(143GKDA014)

摘　　要：针对柱塞式液压缸内液压油流场尺寸跨度较大,流场模拟边界及湍流模型选取较难的问题,提供了较优的边界条件及湍流模型选择参考。建立柱塞式液压缸内流场模型,采用Fluent软件对比分析不同边界类型、边界位置、湍流模型条件下液压油流场的压力、速度特性,比较发现选择导向套与缸体间隙流域一侧为速度入口边界,速度大小取柱塞运动速度,液压缸进油口为压力出口边界时能较好反映液压油流场的流动特性。选用最优边界及湍流模型组合进行液压缸内流场模拟的结果表明,在导向套与缸体间隙流域,流场压力沿流向线性减小,而流动速度在该间隙流域相对较大,为柱塞式液压缸组件的接触磨损及密封问题的流固耦合分析提供技术支持。An optimum choice reference for boundary condition and turbulent model for the simulation of internal flow field of plunger hydraulic cylinder is proposed aiming at the difficult of the boundary and model selection of the hydraulic cylinder internal flow field which has a biggish dimension span. The model of internal flow field of plunger hydraulic cylinder is constructed. With Fluent software, the pressure and velocity of the flow field are compared among different boundary conditions, boundary locations and turbulence models. We find that the flow characteristics can be better simulated by choosing the side of the gap between the guide bush and hydraulic cylinder as the velocity inlet, and taking the cylinder velocity, and the oil entrance of the hydraulic cylinder as the pressure outlet of 0 MPa. Besides, the turbulent model is adopted Realizable K-ε turbulent model, combined with enhanced wall treatment. The results by adopting the optimum choice show that, the pressure of the gap between the guide bush and hydraulic cylinder decreases linearly, and the velocity increases evidently in the gap area. The study has provided significant technical support for the analysis of the fluid-structure coupling of contact wear and seal of plunger hydraulic cylinder.

关 键 词：液压缸 边界条件 湍流模型 流场特性 数值模拟 

分 类 号：TH137[机械工程—机械制造及自动化] TG315.4[金属学及工艺—金属压力加工]