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Mathematical Problems in Engineering
Volume 2011, Article ID 929574, 22 pages
http://dx.doi.org/10.1155/2011/929574
Research Article

Fluid-Structure Interaction Analysis on Turbulent Annular Seals of Centrifugal Pumps during Transient Process

1Department of Chemical and Biological Engineering, Institute of Chemical Machinery and process equipment, Zhejiang University, Hangzhou 310027, China
2Engineering Research Center of High Pressure Process Equipment and Safety, Ministry of Education, Hangzhou 310027, China

Received 6 February 2011; Accepted 31 August 2011

Academic Editor: Christos H. Skiadas

Copyright © 2011 Qinglei Jiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The current paper studies the influence of annular seal flow on the transient response of centrifugal pump rotors during the start-up period. A single rotor system and three states of annular seal flow were modeled. These models were solved using numerical integration and finite difference methods. A fluid-structure interaction method was developed. In each time step one of the three annular seal models was chosen to simulate the annular seal flow according to the state of rotor systems. The objective was to obtain a transient response of rotor systems under the influence of fluid-induced forces generated by annular seal flow. This method overcomes some shortcomings of the traditional FSI method by improving the data transfer process between two domains. Calculated results were in good agreement with the experimental results. The annular seal was shown to have a supportive effect on rotor systems. Furthermore, decreasing the seal clearance would enhance this supportive effect. In the transient process, vibration amplitude and critical speed largely changed when the acceleration of the rotor system increased.