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Mathematical model and experiment validation of fluid torque by shear stress under influence of fluid temperature in hydro-viscous clutch

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Abstract

The current design of hydro-viscous clutch(HVC) in tracked vehicle fan transmission mainly focuses on high-speed and high power. However, the fluid torque under the influence of fluid temperature can not be predicted accurately by conventional mathematical model or experimental research. In order to validate the fluid torque of HVC by taking the viscosity-temperature characteristic of fluid into account, the test rig is designed. The outlet oil temperature is measured and fitted with different rotation speed, oil film thickness, oil flow rate, and inlet oil temperature. Meanwhile, the film torque can be obtained. Based on Navier-Stokes equations and the continuity equation, the mathematical model of fluid torque is proposed in cylindrical coordinate. Iterative method is employed to solve the equations. The radial and tangential speed distribution, radial pressure distribution and theoretical flow rate are determined and analyzed. The models of equivalent radius and fluid torque of friction pairs are introduced. The experimental and theoretical results indicate that tangential speed distribution is mainly determined by the relative rotating speed between the friction plate and the separator disc. However, the radial speed distribution and pressure distribution are dominated by pressure difference at the lower rotating speed. The oil film fills the clearance and the film torque increases with increasing rotating speed. However, when the speed reaches a certain value, the centrifugal force will play an important role on the fluid distribution. The pressure is negative at the outer radius when inlet flow rate is less than theoretical flow, so the film starts to shrink which decreases the film torque sharply. The theoretical fluid torque has good agreement with the experimental data. This research proposes a new fluid torque mathematical model which may predict the film torque under the influence of temperature more accurately.

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Authors and Affiliations

  1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China

    Hongwei Cui, Shouwen Yao, Qingdong Yan, Shanshan Feng & Qian Liu

  2. National Key Laboratory of Vehicular Transmission, Beijing Institute of Technology, Beijing, 100081, China

    Shouwen Yao & Qingdong Yan

Authors
  1. Hongwei Cui
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  2. Shouwen Yao
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  3. Qingdong Yan
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  4. Shanshan Feng
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  5. Qian Liu
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Corresponding author

Correspondence to Shouwen Yao.

Additional information

This project is supported by National Natural Science Foundation of China (Grant No. 51275039)

CUI Hongwei, born in 1986, is currently a PhD candidate at Beijing Institute of Technology, China. He received his bachelor degree from Beijing Institute of Technology, China, in 2008. His research interests include the technology of vehicular transmission and viscous drive.

YAO Shouwen, born in 1971, is currently an associate professor at Beijing Institute of Technology, China. He received his PhD degree from China Academy of Railway Sciences, China, in 2000. His research interests include the technology of vehicular transmission, viscous drive, etc.

YAN Qingdong, born in 1964, is currently a professor at Beijing Institute of Technology, China. He received his PhD degree from Beijing Institute of Technology, China, in 1995. His research interests include the technology of vehicular transmission, hydraulic transmission, viscous drive, etc.

FENG Shanshan, born in 1989, is currently a master candidate at Beijing Institute of Technology, China.

LIU Qian, born in 1989, is currently a graduate student at Beijing Institute of Technology, China.

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Cui, H., Yao, S., Yan, Q. et al. Mathematical model and experiment validation of fluid torque by shear stress under influence of fluid temperature in hydro-viscous clutch. Chin. J. Mech. Eng. 27, 32–40 (2014). https://doi.org/10.3901/CJME.2014.01.032

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  • DOI: https://doi.org/10.3901/CJME.2014.01.032

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