The energy industry depends on centrifugal compressors to produce, process, reinject, and transport many different gases. Centrifugal compressors use one or more impellers to impart momentum to the flowing gas and, thereby, produce an increase in pressure through diffusion. As the operating pressure in a compressor increases, the fluid-rotor interaction at the seals and impellers become more important. Also, the new generation of megascale liquefied natural gas compressors is dependent on accurate assessment of these forces. The aerodynamic forces and cross-coupled stiffness from the impellers cannot be accurately predicted with traditional methods and must be estimated with semiempirical formulations. The result of these inaccuracies is a potential for compressor designs that can experience unexpected, dangerous, and damaging instabilities and subsynchronous vibrations. The current investigation is intended to advance the state of the art to achieve an improved, physics-based method of predicted aerodynamic destabilizing cross-coupling forces on centrifugal compressor impellers using computational fluid dynamics (CFD). CFD was employed in this study to predict the impeller-fluid interaction forces, which gives rise to the aerodynamic cross coupling. The procedure utilized in this study was developed by Moore and Palazzolo (2002, “Rotordynamic Force Prediction of Centrifugal Impeller Shroud Passages Using Computational Fluid Dynamic Techniques With Combined Primary Secondary Flow Model,” ASME J. Eng. Gas Turbines Power, 123, pp. 910–918), which applied the method to liquid pump impellers. Their results showed good correlation to test data. Unfortunately, no such data exist for centrifugal compressors. Therefore, in order to validate the present model, comparisons will be made to predict the instability of an industrial centrifugal compressor. A parametric CFD study is then presented leading to a new analytical expression for predicting the cross-coupled stiffness for centrifugal impellers.
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e-mail: jeff.moore@swri.org
e-mail: david.ransom@swri.org
e-mail: flavia.viana@swri.org
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April 2011
Research Papers
Rotordynamic Force Prediction of Centrifugal Compressor Impellers Using Computational Fluid Dynamics
J. Jeffrey Moore,
J. Jeffrey Moore
Mechanical and Materials Engineering Division,
e-mail: jeff.moore@swri.org
Southwest Research Institute®
, Post Office Drawer 28510, San Antonio, TX 78228-0510
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David L. Ransom,
David L. Ransom
Mechanical and Materials Engineering Division,
e-mail: david.ransom@swri.org
Southwest Research Institute®
, Post Office Drawer 28510, San Antonio, TX 78228-0510
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Flavia Viana
Flavia Viana
Mechanical and Materials Engineering Division,
e-mail: flavia.viana@swri.org
Southwest Research Institute®
, Post Office Drawer 28510, San Antonio, TX 78228-0510
Search for other works by this author on:
J. Jeffrey Moore
Mechanical and Materials Engineering Division,
Southwest Research Institute®
, Post Office Drawer 28510, San Antonio, TX 78228-0510e-mail: jeff.moore@swri.org
David L. Ransom
Mechanical and Materials Engineering Division,
Southwest Research Institute®
, Post Office Drawer 28510, San Antonio, TX 78228-0510e-mail: david.ransom@swri.org
Flavia Viana
Mechanical and Materials Engineering Division,
Southwest Research Institute®
, Post Office Drawer 28510, San Antonio, TX 78228-0510e-mail: flavia.viana@swri.org
J. Eng. Gas Turbines Power. Apr 2011, 133(4): 042504 (10 pages)
Published Online: November 19, 2010
Article history
Received:
May 11, 2007
Revised:
January 3, 2008
Online:
November 19, 2010
Published:
November 19, 2010
Citation
Moore, J. J., Ransom, D. L., and Viana, F. (November 19, 2010). "Rotordynamic Force Prediction of Centrifugal Compressor Impellers Using Computational Fluid Dynamics." ASME. J. Eng. Gas Turbines Power. April 2011; 133(4): 042504. https://doi.org/10.1115/1.2900958
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