Phase change phenomenon and properties of double spiral groove liquid film seals

CAO Hengchao1 HAO Muming1 YANG Wenjing1 WANG Yanhong1 LI Yongfan1 XU Lushuai1

(1.Institute of Sealing Technology, China University of Petroleum (East China), Qingdao, Shandong Province, China 266580)

【Abstract】In order to investigate the influence of phase change on sealing performance, a liquid film seal phase change model is established by simultaneous N-S equation and mass transport equation, and the governing equations are discretized using a finite volume method. The phase change phenomenon of double spiral groove liquid film seal is simulated and the influence of structural parameters on the phase change region and sealing performance is analyzed. The result shows that the physical parameters change when the phase change occurred, and the flow field in the seal clearance and the pressure distribution at the end face changed obviously. The inner spiral groove can provide stable opening force and ensure the sealing end face to be in good lubrication state, but at the same time lead to the seal leakage increased. The sealing leakage can be reduced, and the sealing performance can be improved by reducing the ratio of groove width to face width, the ratio of groove width to dam width, spiral angle, and groove depth of outer spiral groove or increasing the groove number of outer spiral groove.

【Keywords】 double spiral groove; liquid film seal; phase change phenomenon; performance study;

【DOI】

【Funds】 National Natural Science Foundation of China (51375497) Shandong Special Projects of Independent Innovation and Achievement Transformation (2014ZZCX10102-4)

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(Translated by LIU T)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 05, Pages 2110-2119

May 2018

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Article Outline

Abstract

  • Introduction
  • 1 Physical model
  • 2 Numerical solution
  • 3 Analysis of results
  • 4 Conclusions
  • Symbol descriptions
  • References