摘要
为了准确预测液黏离合器内部流场及带排转矩特性,以双圆弧槽摩擦副间隙流场为研究对象,基于流体动力学原理以及牛顿内摩擦定律,建立了考虑空化效应的两相流CFD数学模型,并运用FLUENT软件对流体域进行数值模拟,对比研究空化效应下不同转速、进油压力以及油膜厚度对流场分布、压力分布及带排转矩特性的影响。结果表明,速度分布具有不均匀性,与旋转方向一致的沟槽流体速度较高,且具有导流作用;空化发生在沟槽交叉部位,转速越高,膜厚越大,其空化现象越显著;高压区域发生在入口处,压力随着径向呈现递减趋势,在外径边缘处产生负压效应,承载力随着转速近似线性关系;转速越大,剪切应力提升越明显,当转速ω<(1 400~1 600)r/min时,带排转矩随着转速近似线性关系,当达到某一峰值后又缓慢降低;随着油膜厚度减小,带排转矩有所提升,其峰值点对应的速度有所提高。
In order to accurately predict the internal flow field and drag torque characteristics of the hydro-viscous clutch,with the flow field of double circular groove clearance as the research object,based on the principle of hydrodynamics and the Newtonian internal friction law,a two-phase flow CFD mathematical model considering cavitation effect is established,the fluid field is numerically simulated by FLUENT,and the influence of different rotational speed,inlet pressure and film thickness on field distribution,pressure distribution and drag torque characteristics are studied. The results show that the velocity distribution is inhomogeneous,and the fluid with the same direction of rotation has high velocity and has the function of diversion. The cavitation occurs in the intersection of the groove,the higher the speed,the larger the film thickness,the more the cavitation phenomenon. The high pressure region occurs at the entrance,and the pressure decreases with the radial direction,the negative pressure effect is generated at the outer edge. The bearing capacity is approximately linear with the rotation speed. The higher the rotational speed,the more obvious the shear stress increases. When the speed is less than（ 1 400 ~ 1 600） r/min,the drag torque is approximately linear with speed and then decreases slowly when reaching a certain peak. With the film thickness decreases,the drag torque is improved,and its peak point corresponds to a higher speed.
作者
孙春莲
Sun Chunlian(Department of Materials Engineering,Xinxiang Vocational and Technical College,Xinxiang 453006,China)
出处
《机械传动》
CSCD
北大核心
2018年第8期51-54,共4页
Journal of Mechanical Transmission
关键词
液黏离合器
空化效应
流场分布
带排转矩
Hydro-viscous clutch
Cavitation effect
Flow field distribution
Drag torque
