Dynamic transmission of oil film in soft-start process of HVD considering surface roughness
Abstract
Purpose
The purpose of this paper is to study the dynamic transmission of the oil film in soft start process of hydro-viscous drive (HVD) between the friction pairs with consideration of surface roughness, and obtain the distribution law of temperature, velocity, pressure, shear stress and viscous torque of the oil film.
Design/methodology/approach
The revised soft-start models of HVD were derived and calculated, including average Reynolds equation, asperity contact model, load force model and total torque model. Meanwhile, a 2D model of the oil film between friction pair was built and solved numerically using computational fluid dynamics (CFD) technique in FLUENT.
Findings
The results show that the maximum temperature gradually reduces from the intermediate range (z = 0.5 h) to the inner side of the friction pair along the direction of oil film thickness. As the soft-start process continues, pressure gradient along the direction of the oil film thickness gradually changes to zero. In addition, tangential velocity increases and yet radial velocity decreases with the increase of the radius.
Originality/value
In this paper, it was found that the viscous torque calculated by the numerical method is smaller than that by the CFD model, but their overall trend is almost the same. This also demonstrates the effectiveness of the numerical simulation.
Keywords
Acknowledgements
The authors would like to acknowledge the support of the National Natural Science Foundation of China (51675234, 51575245), and the Special Program of the China Postdoctoral Science Foundation (2013T60502).
Citation
Xie, F., Zhu, J., Cui, J., Zheng, X., Guo, X., Wang, Y. and Agarwal, R.K. (2018), "Dynamic transmission of oil film in soft-start process of HVD considering surface roughness", Industrial Lubrication and Tribology, Vol. 70 No. 3, pp. 463-473. https://doi.org/10.1108/ILT-01-2017-0002
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited