A Design to Improve the Effective Damping Characteristics of Hole-Pattern-Stator Annular Gas Seals Academic Article uri icon


  • 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. Copyright © 2008 by ASME.

author list (cited authors)

  • Childs, D. W., Shin, Y., & Seifert, B.

citation count

  • 7

publication date

  • January 2008