摘要
为精确预测高速工况的流场特性,运用自由表面(VOF)模型,对摩擦副流体进行了数值模拟,得到了两相流区域分布及其演变规律,预测了全转速范围的转矩。研究表明:两相流区域主要受流体动压效应、流体静压效应影响;输入转速越高,摩擦副流体空气体积分数越大,供油量越大,空气体积分数越小;流体转矩随着转速升高而增大,而过某临界值时,转矩下降。作者还构建了液黏调速离合器性能试验台架,对摩擦副的油膜转矩传递特性进行试验,验证了预测模型的合理性。
With the increase of vehicle transmission power,the speed of cooling fan＇s hydroviscous clutch is also increased more highly. In order to simulate the flow field of oil film more precisely for high speed condition,free surface model（ VOF） is used to simulate the gas-liquid two-phase flow field. The regional distribution and evolution of two-phase are finally obtained with the torque of full speed range. The results show that two-phase region is mainly affected by hydrodynamic and hydrostatic effect of fluid,and the higher the input speed,the bigger the air volume fraction,while the air volume fraction is getting smaller when the oil supply is greater. The fluid torque increases with the input rotation speed and decreases after the critical speed. Finally, the experimental bench of hydro-viscous speed clutch performance is established,and the friction torque transfer characteristics versus speed performance are compared with experiments,which verifies the reasonableness of the prediction model.
出处
《兵器装备工程学报》
CAS
2017年第7期1-7,共7页
Journal of Ordnance Equipment Engineering
基金
国家自然科学基金资助项目(51275039)
关键词
液黏调速离合器
VOF模型
两相流
数值模拟
流体剪切转矩
hydro-viscous clutch
VOF model
Two-phase flow
numerical simulation
fluid torque caused by shear stress
