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Research Papers: Multiphase Flows

Study on Aeration for Disengaged Wet Clutches Using a Two-Phase Flow Model

[+] Author and Article Information
Shihua Yuan, Jibin Hu, Zengxiong Peng

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

Kai Guo

National Key Laboratory of Vehicular Transmission, Beijing Institute of Technology, Beijing 100081, Chinaguokai@bit.edu.cn

J. Fluids Eng 132(11), 111304 (Nov 17, 2010) (6 pages) doi:10.1115/1.4002874 History: Received November 20, 2009; Revised October 07, 2010; Published November 17, 2010; Online November 17, 2010

The existing computational models for disengaged wet clutches are deduced based on the single-phase flow theory. However, the complex gas-liquid two-phase flow is formed due to aeration at high rotational speeds. The objective of this study is to use a two-phase flow model to demonstrate the aeration process at different rotational speeds not only of the friction plate but also of the separator plate. A nongrooved, steady-state, two-phase flow computational fluid dynamics model is built using FLUENT , and it is validated by experimental data. The results reveal that air enters the clearance at a critical rotational speed, which causes the drag torque to sharply decrease. The aeration mode and flow pattern are obtained via simulations. The rotational speed of the separator plate has a significant effect on the aeration, including the speed magnitude and direction.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of a disengaged wet clutch pack

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Figure 2

Schematic of a partial oil film

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Figure 3

Geometric structure of the wet clutch

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Figure 5

Photograph of the experimental apparatus

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Figure 6

Diagram of the test rig

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Figure 7

Comparison of drag torque between simulation results and test data

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Figure 8

Flow patterns with a stationary SP

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Figure 9

Comparison of flow patterns between stationary and rotational SP at low speeds

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Figure 10

Comparison of drag torques between stationary and rotational SP at low speeds

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Figure 11

Flow patterns while SP rotates at −1000 r/min

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Figure 12

Flow patterns while SP rotates at 1000 r/min

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Figure 13

Comparison of drag torques while SP rotates at high speeds

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