Numerical Analysis of Gas Thermal Viscosity Effect on Performance of a Spiral-Groove Gas Face Seal

Abstract

Abstract: The modified Reynolds equation was presented based on the theories of both gas polytrophic process and gas lubrication so as to study the thermal viscosity effect of gas on seal performance of a spiralgrooved dry gas seal (SDGS). The finite element method was used to solve the governing equations and analyze the influence of thermalviscosity on the dry gas seal sealing performance. The results show that due to the high polytrophic exponent, the greater the values of gas film pressure, gas film temperature and gas film viscosity, the stronger the loading capacity of gas film. When an SDGS is operating at high speed or at medial or high pressures of sealed gas, the thermal viscosity effect should be considered to get more accurate simulation values of seal performance. The variations of seal performance with film thickness would not be affected by thermalviscosity effect when film thickness is greater than two micrometer.
Key words：

Key words: spiral-grooved dry gas seal (S-DGS), polytrophic exponent, thermal viscosity effect, finite element method

CLC Number:

TH 138

XU Jing-a, PENG Xu-Dong-a, b , BAI Shao-Xian-a, b , MENG Xiang-Kai-a, b , LI Ji-Yun-a, b . Numerical Analysis of Gas Thermal Viscosity Effect on Performance of a Spiral-Groove Gas Face Seal[J]. Journal of Shanghai Jiaotong University, 2012, 46(05): 722-728.

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