摘要
为避免液压缸活塞温度过高,引发密封圈失效,建立活塞冷却腔内的两相流模型,基于Fluent对油液的流场及传热特性进行数值模拟。选用VOF多相流计算模型和SST k-ω湍流模型,结合液压缸活塞行程特性,通过UDF方法定义入口参数,得出不同活塞位置下的油液液相比例分布、油液速度场和对流换热系数变化规律。研究结果表明:冷却油液的瞬时比例和速度有着密切的联系,提升油液速率是改善传热性能的重要手段;该多相流模型的可靠性高,通过近壁模型法与壁面函数法得出的平均对流换热系数没有明显的差异。
In order to avoid the failure of sealing ring caused by the high temperature of hydraulic cylinder piston,the two-phase flow model in the cooling cavity is established,and the flow field and heat transfer characteristics in the cavity are simulated and analyzed based on Fluent.The VOF multiphase flow calculation model and SST k-ωturbulence model are selected,and the inlet parameters are defined by UDF method in combination with the piston stroke characteristics.The change rules of liquid phase proportion distribution,oil velocity field and convective heat transfer coefficient at different piston positions are obtained.The results show that the proportion of oil is closely related to the speed,and improving the oil speed is an important means to improve the heat transfer performance.The reliability of the multiphase flow model is high.There is no obvious difference between the average convective heat transfer coefficient obtained by the near wall model method and the wall function method.
作者
王香
WANG Xiang(Yantai Automotive Engineering Career Academy,Yantai 265500,China)
出处
《液压气动与密封》
2021年第5期30-34,共5页
Hydraulics Pneumatics & Seals
基金
山东省自然科学基金项目(ZR2016EEB36)。
关键词
流体
液压缸
活塞
多相流
有限元
湍流
fluid
hydraulic cylinder
piston
multiphase flow
finite element
turbulence
