Annular labyrinth seals often have a destabilizing effect on pump rotordynamics due to the large cross-coupled forces generated when the fluid is squeezed by an oscillating rotor. In this study several novel groove geometries are investigated for their effect on the rotordynamic coefficients of the labyrinth seal. The groove cavity geometry of a baseline 267 mm balance drum labyrinth seal with a clearance of 0.305 mm and 20 equally spaced groove cavities were optimized for minimum leakage. From the pool of possible groove designs analyzed, nine test cases were selected for maximum or minimum leakage and for a variety of groove cavity shapes. The rotordynamic coefficients were calculated for these cases using a hybrid CFD-bulk flow method. The rotordynamic coefficients obtained by this method were then used with a rotordynamic model of the entire pump to determine the overall stability. Results show that labyrinth seal’s groove shape can be optimized to generate lower leakage rates, while the effects on dynamic properties are only minimally changed. If the seal dynamic response needs to be modified in addition to targeting a lower leakage rate, for instance to exhibit increased damping values, then the leakage rate and the damping coefficient need to be set as objective functions in the optimization loop.
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ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
July 26–31, 2015
Seoul, South Korea
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5721-2
PROCEEDINGS PAPER
Dynamic Response Analysis of Balance Drum Labyrinth Seal Groove Geometries Optimized for Minimum Leakage
Alexandrina Untaroiu,
Alexandrina Untaroiu
University of Virginia, Charlottesville, VA
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Neal Morgan,
Neal Morgan
University of Virginia, Charlottesville, VA
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Vahe Hayrapetian,
Vahe Hayrapetian
Flowserve Corporation, Vernon, CA
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Bruno Schiavello
Bruno Schiavello
Flowserve Corporation, Bethlehem, PA
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Alexandrina Untaroiu
University of Virginia, Charlottesville, VA
Neal Morgan
University of Virginia, Charlottesville, VA
Vahe Hayrapetian
Flowserve Corporation, Vernon, CA
Bruno Schiavello
Flowserve Corporation, Bethlehem, PA
Paper No:
AJKFluids2015-33423, V001T33A012; 10 pages
Published Online:
November 20, 2015
Citation
Untaroiu, A, Morgan, N, Hayrapetian, V, & Schiavello, B. "Dynamic Response Analysis of Balance Drum Labyrinth Seal Groove Geometries Optimized for Minimum Leakage." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 1: Symposia. Seoul, South Korea. July 26–31, 2015. V001T33A012. ASME. https://doi.org/10.1115/AJKFluids2015-33423
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