A recent CFD perturbation model for turbomachinery seal rotordynamics was extended for labyrinth shunt injection with an arbitrarily high pressure gas. A large number of measured cases with labyrinth injection pressure at approximately 13.8 bars (200 psi) were computed and compared with measurements. The drastically reduced (negative) cross-coupled stiffness, which is the primary advantage from the use of shunt injection in gas labyrinth seal applications, was well predicted. The agreement with measurements for , , and was within about 40%, 60% and 10%, respectively. In addition, it was found that moving the injection toward the high pressure end of the seal gives , , and values that are rotordynamically only slightly more stabilizing. Further, the radial distributions of the flow perturbation quantities give support to the two-control volume approach for developing bulk-flow models for labyrinth seal rotordynamics.
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January 2003
Technical Papers
Predicted Effects of Shunt Injection on the Rotordynamics of Gas Labyrinth Seals
N. Kim, Graduate Assistant,,
N. Kim, Graduate Assistant,
Weatherford International, Inc., Houston, TX
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S.-Y. Park, Graduate Assistant,
S.-Y. Park, Graduate Assistant
Mechanical Engineering Department, Texas A&M University, College Station, TX
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D. L. Rhode, Professor
D. L. Rhode, Professor
Mechanical Engineering Department, Texas A&M University, College Station, TX
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N. Kim, Graduate Assistant,
Weatherford International, Inc., Houston, TX
S.-Y. Park, Graduate Assistant
Mechanical Engineering Department, Texas A&M University, College Station, TX
D. L. Rhode, Professor
Mechanical Engineering Department, Texas A&M University, College Station, TX
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, New Orleans, LA, June 4–7, 2001; Paper 2001-GT-239. Manuscript received by IGTI, Dec. 2000, final revision, Mar. 2001. Associate Editor: R. Natole.
J. Eng. Gas Turbines Power. Jan 2003, 125(1): 167-174 (8 pages)
Published Online: December 27, 2002
Article history
Received:
December 1, 2000
Revised:
March 1, 2001
Online:
December 27, 2002
Citation
Kim, N., Park, S., and Rhode, D. L. (December 27, 2002). "Predicted Effects of Shunt Injection on the Rotordynamics of Gas Labyrinth Seals ." ASME. J. Eng. Gas Turbines Power. January 2003; 125(1): 167–174. https://doi.org/10.1115/1.1520539
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