摘要
基于计算流体动力学理论,建立液黏调速离合器摩擦副间流体域数学模型,运用CFD模拟软件对径向槽摩擦副间复杂多相流流场进行数值模拟,研究空化效应下沟槽数量和转速对油膜压力分布的影响;采用相间耦合的方式,数值分析固定工况下承载力随着颗粒质量分数和直径的变化规律。结果表明,随着转速的增加,压力随之增大,并呈现周期性、不均匀性,其中压力沿半径增大的方向逐渐减小并趋于一致,槽数对最大压力几乎无影响;过渡区域压力波动较显著,并在沟槽边缘出现负压,空化效应最显著的地方发生在与旋转方向相反的沟槽内侧壁面;随着颗粒质量分数的增加,承载力有所增大,相比于最小膜厚,颗粒直径过大或过小,其对承载力的影响不大;当粒径超过某一固定值时,承载力将会显著提高。
Based on the computational fluid dynamics theory,the mathematical model of the fluid domain inside the hydro-viscous speed regulating clutch is established,and the multi-phase flow field in the radial groove friction pair is solved numerically by the CFD software.The influence of the groove number and speed on the oil film pressure distribution under cavitation effect is studied,and the change of load-carrying capacity along with particle mass fraction and diameter is analyzed by the method of phase coupling.The result indicates that the pressure increases with the increase of the speed,and shows the periodicity and inhomogeneity,in which the pressure decreases gradually along the direction of the radius increase and tends to be consistent,and the groove number has little effect on the maximum pressure.In the transitional region,the pressure fluctuates obviously,and the negative pressure appears at the edge of the groove,the most significant cavitation effect occurs in the inner wall of the groove opposite to the direction of rotation.With the increase of the particles mass fraction,the load-carrying capacity increases,and compared with the minimum film thickness,the particle diameter is too large or too small,its influence on load-carrying capacity is not significant,when the particle size exceeds a certain value,the load-carrying capacity will be significantly improved.
作者
郭广超
邢作辉
Guo Guangchao;Xing Zuohui(Department of Automotive Technical,Xinxiang Vocational and Technical College,Xinxiang 453000,China)
出处
《机械传动》
CSCD
北大核心
2018年第9期72-74,139,共4页
Journal of Mechanical Transmission
基金
国家自然科学基金(51375019)
关键词
液黏调速离合器
空化
颗粒
承载力
Hydro-viscous speed regulating clutch
Cavitation
Particle
Load-carrying capacity
