考虑热效应影响的液黏调速离合器流体剪切转矩预测研究  

Prediction on the Fluid Torque by Shear Stress in Hydro-viscous Drive with Consideration of Thermal Effect

作　　者：冯珊珊[1] 姚寿文[1,2] 刘茜[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北京理工大学车辆传动国家重点实验室,北京100081

出　　处：《液压与气动》2015年第7期89-92,95,共5页Chinese Hydraulics & Pneumatics

摘　　要：为了更准确地对液黏调速离合器流体剪切转矩进行预测,以液黏调速离合器摩擦副间的流体为研究对象,建立了考虑热效应影响的三维CFD模型,并考虑了黏温特性的影响,应用计算流体力学软件CFD-ACE+对流场进行求解,得到了摩擦副间流体的压力和温度分布以及流体剪切转矩的数值解;通过实验研究对比分析了不同转速和油膜厚度下的流体剪切转矩。结果表明:影响温度分布的主要因素是流体剪切线速度;热效应对摩擦副间流体的压力分布有较小的影响;由于流体温度对黏度的影响,流体剪切转矩随着转速差的增加而缓慢增大。因此,通过与实验数据对比分析,考虑热效应影响的三维CFD模型能够更为准确地对转矩进行预测。In order to predict the fluid torque by shear stress of hydro-viscous drive more precisely. Taking account into the effect of viscosity-temperature characteristics, we develop a three-dimensional model with consideration thermal effect by using a commercial software CFD-ACE ＋. The pressure, temperature distribution and fluid torque by shear stress are obtained. The result indicates that the most important factor effecting the temperature distribution is line velocity of fluid shear; thermal effect has a little contribution on pressure increasing; torque of fluid power transmission by shear stress increase more slowly as the rotate velocity increase. The simulation result is close to ex- perimental data. The model with consideration of heat transfer could predicted the torque more precisely.

关 键 词：液黏调速离合器 热效应 流体剪切转矩 

分 类 号：TH137[机械工程—机械制造及自动化]