Labyrinth seals are used in various kinds of turbo machines to reduce internal leakage flow. The working fluid or, the gas passing through the rotor shaft labyrinth seals, often generates driving force components that may increase the unstable vibration of the rotor. It is important to know the accurate rotordynamic force components for predicting the instability of the rotor-bearing-seal system. The major goals of this research was to calculate the rotordynamic force of a labyrinth seals utilizing a commercial CFD program and to further compare those results to an existing bulk flow computer program currently used by major US machinery manufacturers. The labyrinth seals of a steam turbine and a compressor eye seal are taken as objects of analysis. For each case, a 3D model with eccentric rotor was solved to obtain the rotordynamic force components. The leakage flow and rotor dynamics force predicted by CFX TASCFlow are compared with the results the existing bulk flow analysis program DYNLAB. The results show that the bulk flow program gives a pessimistic prediction of the destabilizing forces for the conditions under investigation. Further research work will be required to fully understand the complex leakage flows in turbo machinery.
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ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
June 16–19, 2003
Atlanta, Georgia, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-3687-8
PROCEEDINGS PAPER
Application of CFD Analysis for Rotating Machinery: Part 2 — Labyrinth Seal Analysis
Toshio Hirano,
Toshio Hirano
Virginia Polytechnic Institute and State University, Blacksburg, VA
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Zenglin Guo,
Zenglin Guo
Virginia Polytechnic Institute and State University, Blacksburg, VA
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R. Gordon Kirk
R. Gordon Kirk
Virginia Polytechnic Institute and State University, Blacksburg, VA
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Toshio Hirano
Virginia Polytechnic Institute and State University, Blacksburg, VA
Zenglin Guo
Virginia Polytechnic Institute and State University, Blacksburg, VA
R. Gordon Kirk
Virginia Polytechnic Institute and State University, Blacksburg, VA
Paper No:
GT2003-38984, pp. 661-667; 7 pages
Published Online:
February 4, 2009
Citation
Hirano, T, Guo, Z, & Kirk, RG. "Application of CFD Analysis for Rotating Machinery: Part 2 — Labyrinth Seal Analysis." Proceedings of the ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. Volume 4: Turbo Expo 2003. Atlanta, Georgia, USA. June 16–19, 2003. pp. 661-667. ASME. https://doi.org/10.1115/GT2003-38984
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