This paper presents ongoing investigations on calculation and measurement of rotordynamic coefficients for brush-labyrinth gas seals. The seals are tested on static and dynamic test rigs to measure leakage, pressure distribution, and seal specific forces. To predict seal performance a full three-dimensional eccentric CFD model is considered. Rotordynamic coefficients are calculated using the whirling rotor method. The bristle pack of the brush seal is modeled using the porous medium approach. The prediction results show some deviations in absolute values of stiffness and damping coefficients in comparison with the experimental values, but the trends are similar. Comparing with a staggered labyrinth seal, the brush seal improves rotordynamic characteristics in most cases. Position of the brush seal in sealing configuration has a great influence on the stiffness and damping coefficients, while leakage performance remains relatively unaffected. The capability of the brush seal model based on the porous medium approach to predict rotordynamic coefficients is discussed.
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ASME Turbo Expo 2010: Power for Land, Sea, and Air
June 14–18, 2010
Glasgow, UK
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4401-4
PROCEEDINGS PAPER
CFD Prediction and Test Results of Stiffness and Damping Coefficients for Brush-Labyrinth Gas Seals
Alexander O. Pugachev,
Alexander O. Pugachev
Technische Universita¨t Mu¨nchen, Garching, Germany
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Martin Deckner
Martin Deckner
eta Energieberatung GbR, Pfaffenhofen a. d. Ilm, Germany
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Alexander O. Pugachev
Technische Universita¨t Mu¨nchen, Garching, Germany
Martin Deckner
eta Energieberatung GbR, Pfaffenhofen a. d. Ilm, Germany
Paper No:
GT2010-22667, pp. 175-185; 11 pages
Published Online:
December 22, 2010
Citation
Pugachev, AO, & Deckner, M. "CFD Prediction and Test Results of Stiffness and Damping Coefficients for Brush-Labyrinth Gas Seals." Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 6: Structures and Dynamics, Parts A and B. Glasgow, UK. June 14–18, 2010. pp. 175-185. ASME. https://doi.org/10.1115/GT2010-22667
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