Research Papers: Hydrodynamic Lubrication

A Thermohydrodynamic Analysis of Dry Gas Seals for High-Temperature Gas-Cooled Reactor

[+] Author and Article Information
Wang Hong

Institute of Nuclear and New Energy Technology,
Tsinghua University,
Beijing 100084, China

Zhu Baoshan

Department of Thermal Engineering,
State Key Laboratory of Hydroscience and Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: bszhu@mail.tsinghua.edu.cn

Lin Jianshu

China Nuclear Power Technology Research Institute,
Shenzhen, Guangdong 518026, China

Ye Changliu

China Nuclear Power Design Company Ltd.,
Shenzhen, Guangdong 518031, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 13, 2011; final manuscript received August 9, 2012; published online December 26, 2012. Assoc. Editor: C. Fred Higgs III.

J. Tribol 135(2), 021701 (Dec 26, 2012) (9 pages) Paper No: TRIB-11-1195; doi: 10.1115/1.4007807 History: Received October 13, 2011; Revised August 09, 2012

A comprehensive analysis method is proposed to resolve the problem of simulating the complex thermoflow with two kinds of distinct characteristic lengths in a dry gas seal. A conjugated simulation of the complicated heat transfer and the gas film flow is carried out by using the commercial computational fluid dynamics (CFD) software CFX. By using the proposed method, three-dimensional velocity and pressure fields in the gas film flow and the temperature distribution within the sealing rings are investigated for three kinds of film thickness, respectively. A comparison of thermohydrodynamic characteristics of the dry gas seal is conducted between the sealed gas of air and helium. The latter one is used in a helium compressor for a high-temperature gas-cooled reactor (HTGR). From comparisons and discussions of a series of simulation results, it will be found that the comprehensive proposal is effective and simulation results are reasonable. Even under a hypothetical accidental condition, the maximum temperature rise in the dry gas seal is within the acceptable range of HTGR safety requirements.

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Fig. 1

An example of dry gas seals

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Fig. 2

Boundary conditions of isothermal model

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Fig. 3

Boundary conditions of preliminary model

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Fig. 4

Boundary conditions of detailed model

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Fig. 5

Pressure field in the gas film for three kinds of film thickness

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Fig. 6

Pressure on the edge of groove-ridge pair

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Fig. 7

Heat transfer coefficients of stationary ring (on W1)

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Fig. 8

Heat transfer coefficients of rotating ring (on W2)

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Fig. 9

Friction heat and churning heat

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Fig. 10

Distribution of temperature on the sealing surface for three kinds of film thickness by preliminary model

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Fig. 11

Distribution of temperature on the sealing surface for three kinds of film thickness by detailed model

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Fig. 12

Heat flux distribution on the sealing surface of rotating ring

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Fig. 13

Pressure distribution for helium

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Fig. 14

Pressure on the edge of groove-ridge pair

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Fig. 15

Heat transfer coefficient on surface W1 and W2 in helium and air medium

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Fig. 16

Temperature distribution in seal rings



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