Improved rotordynamic stability is desired by end users, and centrifugal compressor manufacturers are expected to meet, if not exceed, this expectation. Compressor manufacturers are required to design and build machines that are rotordynamically stable on the test stand and in the field. Confidence has been established in predicting the excitation forces from seals and bearings, but impeller aerodynamic excitation forces continue to be a challenge. While much attention is paid to impellers from an aerodynamic performance point of view, more efforts are needed from a rotordynamic standpoint. A high-pressure, reinjection centrifugal compressor is analyzed in order to predict rotordynamic stability using the best available resources for seals and bearings. Impeller shroud forces are predicted using the bulk-flow model developed by Gupta and Childs (Gupta, M., and Childs, D., Proc. of ASME Turbo Expo 2000, Power for Land, Sea, and Air). Each impeller stage is analyzed and an attempt is made to improve the estimation of impeller aerodynamic excitation forces. Logarithmic decrement (log dec) predictions for the full rotor model consisting of all the stages and seals are compared to the full-load full-pressure test measured values using a magnetic bearing exciter. A good correlation is obtained between the measured test results and analytical predictions.
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e-mail: manoj_k_gupta@dresser-rand.com
e-mail: TSoulas@dresser-rand.com
e-mail: dchilds@mengr.tamu.edu
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March 2008
Research Papers
New Steps to Improve Rotordynamic Stability Predictions of Centrifugal Compressors
Manoj K. Gupta,
e-mail: manoj_k_gupta@dresser-rand.com
Manoj K. Gupta
Dresser-Rand Company
, 1200 W. Sam Houston Pkwy N., Houston, TX 77043
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Thomas A. Soulas,
e-mail: TSoulas@dresser-rand.com
Thomas A. Soulas
Dresser-Rand Company
, 1200 W. Sam Houston Pkwy N., Houston, TX 77043
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Dara W. Childs
Dara W. Childs
Turbomachinery Laboratory,
e-mail: dchilds@mengr.tamu.edu
Turbo Expo 2006, Texas A&M University
, College Station, TX 77843
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Manoj K. Gupta
Dresser-Rand Company
, 1200 W. Sam Houston Pkwy N., Houston, TX 77043e-mail: manoj_k_gupta@dresser-rand.com
Thomas A. Soulas
Dresser-Rand Company
, 1200 W. Sam Houston Pkwy N., Houston, TX 77043e-mail: TSoulas@dresser-rand.com
Dara W. Childs
Turbomachinery Laboratory,
Turbo Expo 2006, Texas A&M University
, College Station, TX 77843e-mail: dchilds@mengr.tamu.edu
J. Eng. Gas Turbines Power. Mar 2008, 130(2): 022505 (5 pages)
Published Online: March 3, 2008
Article history
Received:
May 2, 2007
Revised:
July 6, 2007
Published:
March 3, 2008
Citation
Gupta, M. K., Soulas, T. A., and Childs, D. W. (March 3, 2008). "New Steps to Improve Rotordynamic Stability Predictions of Centrifugal Compressors." ASME. J. Eng. Gas Turbines Power. March 2008; 130(2): 022505. https://doi.org/10.1115/1.2799531
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