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Research Papers: Applications

Thermal Analysis and Simulation of Auxiliary Bearings and Its Application in the High Temperature Reactor-10

[+] Author and Article Information
Yulan Zhao

Institute of Nuclear and New Energy Technology,
Collaborative Innovation Center of Advanced
Nuclear Energy Technology,
The Key Laboratory of Advanced
Reactor Engineering and Safety,
Ministry of Education,
Tsinghua University,
Beijing 100084, China
e-mail: zhaoyulan1989@163.com

Guojun Yang

Institute of Nuclear and New Energy Technology,
Collaborative Innovation Center of Advanced
Nuclear Energy Technology,
The Key Laboratory of
Advanced Reactor Engineering and Safety,
Ministry of Education,
Tsinghua University,
Beijing 100084, China
e-mail: yanggj@tsinghua.edu.cn

Zhengang Shi

Institute of Nuclear and New Energy Technology,
Collaborative Innovation Center of Advanced
Nuclear Energy Technology,
The Key Laboratory of Advanced
Reactor Engineering and Safety,
Ministry of Education,
Tsinghua University,
Beijing 100084, China
e-mail: shizg@tsinghua.edu.cn

Lei Zhao

Institute of Nuclear and New Energy Technology,
Collaborative Innovation Center of Advanced
Nuclear Energy Technology,
The Key Laboratory of
Advanced Reactor Engineering and Safety,
Ministry of Education,
Tsinghua University,
Beijing 100084, China
e-mail: zhaolei@tsinghua.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 15, 2014; final manuscript received June 27, 2015; published online August 14, 2015. Assoc. Editor: Daniel Nélias.

J. Tribol 138(1), 011102 (Aug 14, 2015) (11 pages) Paper No: TRIB-14-1307; doi: 10.1115/1.4031003 History: Received December 15, 2014

The auxiliary bearing is applied to provide mechanical uphold for the rotational dropping rotor when contact event happens due to the active magnetic bearing (AMB) failure emergencies. During the rotor drop process, the auxiliary bearing will endure huge impact force and friction heat generation. The thermal behavior will affect the mechanical interaction and dynamic behavior of the auxiliary bearing and even induce rapid failure especially when excessive temperature growth occurs. The Institute of Nuclear and New Energy Technology (INET) of Tsinghua University in China has proposed the 10 MW high-temperature gas-cooled reactor (HTR-10). It is designed to guarantee the inherent safety and economic competitiveness. The dry-lubricated ceramic auxiliary bearing is utilized to protect the AMB and aims to ensure the safety of the AMB system in the HTR-10 in the case of the special operational requirements in the reactor. This paper simulates the process of the rotor drop on the auxiliary bearings in the AMB system of the helium blower of the HTR-10, including the analysis of thermal growth based on the Hertzian contact model and a one-dimensional (1D) thermal heat transfer network model. The study results demonstrate the validation of the bearing models and elucidate different responses between mechanical and ceramic auxiliary bearings during contact events. The research in this paper offers important theoretical bases for the auxiliary bearing design to guarantee the safety of the whole system.

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References

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Figures

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Fig. 1

The HTR axial rotor-auxiliary bearing system

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Fig. 2

Axial contact surface

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Fig. 3

Radial contact surface

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Fig. 4

The cross-sectioned bearing model with thermal nodes

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Fig. 5

Heat transfer network of auxiliary bearing

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Fig. 6

The flow chart of the matlab codes

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Fig. 8

The axial displacement

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Fig. 9

The rotor's orbit by experiment

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Fig. 10

The axial displacement by experiment

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Fig. 11

The axial velocity of the rotor

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Fig. 12

Axial contact force

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Fig. 13

Radial contact force

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Fig. 14

Axial and radial heat generation

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Fig. 15

Inner race heat generation

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Fig. 16

Outer race heat generation

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Fig. 17

Thermal expansion force

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Fig. 18

Temperature of the nodes

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Fig. 19

Temperature of the inner race

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Fig. 20

Temperature of the inner race contact region

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Fig. 21

Temperature of the ball center

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Fig. 22

Temperature of the inner race

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Fig. 23

Temperature of the inner race contact region

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Fig. 24

Temperature of the ball center

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Fig. 25

Temperature of the inner race contact region

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