Predictions are presented for hole-pattern-stator seals for which the hole depth is varied axially, showing that various depth patterns can significantly improve damping performance in terms of both increasing the seal’s effective damping and reducing its crossover frequency—the frequency at which effective damping changes from positive to negative. Test results are presented for the seal with the best variable hole depth (VHD) pattern showing an increase in peak damping by a factor of 1.6 over a constant hole depth (CHD) design versus predictions of 2.7. The crossover frequency is reduced by approximately 40%. The VHD seal has a significant negative static stiffness that probably arises from a friction-factor-jump phenomenon, not flow path divergence. The VHD seal leaks less than a comparable CHD design.
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January 2008
Research Papers
A Design to Improve the Effective Damping Characteristics of Hole-Pattern-Stator Annular Gas Seals
Dara W. Childs,
Dara W. Childs
The Leland T. Jordan Professor of Mechanical Engineering
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Yoon-Shik Shin,
Yoon-Shik Shin
Graduate Research Assistant
Turbomachinery Laboratory,
Texas A&M University
, College Station, TX 77843
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Brent Seifert
Brent Seifert
Graduate Research Assistant
Turbomachinery Laboratory,
Texas A&M University
, College Station, TX 77843
Search for other works by this author on:
Dara W. Childs
The Leland T. Jordan Professor of Mechanical Engineering
Yoon-Shik Shin
Graduate Research Assistant
Turbomachinery Laboratory,
Texas A&M University
, College Station, TX 77843
Brent Seifert
Graduate Research Assistant
Turbomachinery Laboratory,
Texas A&M University
, College Station, TX 77843J. Eng. Gas Turbines Power. Jan 2008, 130(1): 012505 (7 pages)
Published Online: January 9, 2008
Article history
Received:
June 13, 2006
Revised:
August 16, 2006
Published:
January 9, 2008
Citation
Childs, D. W., Shin, Y., and Seifert, B. (January 9, 2008). "A Design to Improve the Effective Damping Characteristics of Hole-Pattern-Stator Annular Gas Seals." ASME. J. Eng. Gas Turbines Power. January 2008; 130(1): 012505. https://doi.org/10.1115/1.2771242
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