Interaction effect of optimized value of geometric parameters of spiral groove of dry gas seal

JIANG Jinbo1 CHEN Yuan1 ZHAO Wenjing1 LI Jiyun1 PENG Xudong1

(1.Engineering Research Center of Process Equipment and Its Remanufacturing of Ministry of Education, Zhejiang University of Technology, Hangzhou, Zhejiang, China 310014)

【Abstract】The interaction effects of other geometric parameters on the optimized value of a certain geometric parameters of spiral groove dry gas seal (DGS) in low pressure were analyzed for the purpose of solving the problem of the interaction effects of geometric parameters of hydrodynamic groove on objective function that are ignored in optimization design of hydrodynamic groove of DGS which leads to the inaccuracy of optimized value of geometric parameters. Geometric and mathematical models of spiral groove DGS were set up according to the theory of gas lubrication. The pressure distribution and steady performance were obtained by solving the Reynolds equations by using finite difference method, and several characterized parameters of spiral groove were defined. The change rules of optimized values for the maximum film stiffness of a certain geometric parameter of spiral groove with other geometric parameters in different operation velocity were presented. The results show that complicated interaction effect relationships exist between the geometric parameters of spiral groove DGS, which suit for the three comprehensive design criteria, including decrease of the amplitude changes of real flow area of groove, groove length-width ratio and groove length-depth ratio. The maximum film stiffness obtained by the optimization method of considering the interaction effect of geometric parameters is about 11.4% larger than that obtained by the single factor optimization method in the given example.

【Keywords】 dry gas seal; optimization; numerical analysis; stability; interaction effect;

【DOI】

【Funds】 National Natural Science Foundation of China (51575490, 51705458) Key Program of Zhejiang Provincial Natural Science Foundation (LZ15E050002) Zhejiang Provincial Natural Science Foundation of Zhejiang Province (LQ17E050008, LQ16E050009)

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(Translated by Song K)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 04, Pages 1518-1527

April 2018

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Article Outline

Abstract

  • Introduction
  • 1 Analytical model
  • 2 Results and discussion
  • 3 Conclusions
  • Symbol description
  • References