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Analysis of cavitation of downstream pumping spiral groove liquid film seal considering mass conserving boundary condition

YANG Wenjing1 HAO Muming1 CAO Hengchao1 YUAN Junma1 LI Han1

(1.College of Chemical Engineering, China University of Petroleum (East China) , Qingdao, Shandong, China 266580)

【Abstract】Cavitation occurrence in the liquid film affects the lubrication performance of mechanical seals. A mathematical model of spiral groove liquid film seal was established based on the mass-conserving JFO cavitation boundary condition. The Reynolds governing equation was solved by the streamline upwind finite element method, and cavitation distribution was obtained. The calculation result was verified by cavitation visualization experiment. The influences of the geometrical parameters of spiral groove on cavitation characteristics were analyzed with the critical speed and critical pressure of cavitation as the characterization. The results indicate that the cavitation area in spiral groove is of wing section type, and it increases with increasing rotating speed and decreases with increasing inner pressure. The maximum circumferential length of cavitation is located near the groove radius. The critical speed of cavitation increases with the increase of groove number and depth, but decreases with the increase of spiral angle, radial seal dam extent and groove width ratio. The changing trends of critical pressure of cavitation with geometrical parameters are opposite to those of critical speed of cavitation. The effective control of cavitation can be achieved by reasonable selection of geometrical parameters.

【Keywords】 spiral groove liquid film seal; cavitation; geometrical parameters; critical speed of cavitation; critical pressure of cavitation; finite element method;

【DOI】

【Funds】 National Natural Science Foundation of China (51375497) Key Research Program of Dongying (2016YF01)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 09, Pages 3932-3943+3758

September 2018

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Article Outline

Abstract

  • Introduction
  • 1 Computation model
  • 2 Calculation results and analysis
  • 3 Conclusion
  • Symbol description
  • References