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Experimental and Analytical Assessment of Cavity Modes in a Gas Turbine Wheelspace

[+] Author Affiliations
Rachel A. Berg, Gregory Laskowski

GE Aviation, Lynn, MA

C. S. Tan

MIT Gas Turbine Laboratory, Cambridge, MA

Zhongman Ding

GE Power, Greenville, SC

Pepe Palafox

GE Aviation, Evendale, OH

Rinaldo Miorini

GE Global Research Center, Niskayuna, NY

Paper No. GT2017-63734, pp. V05BT15A013; 16 pages
doi:10.1115/GT2017-63734
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 5B: Heat Transfer
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5088-6
  • Copyright © 2017 by ASME

abstract

Fast response pressure data acquired in a high-speed 1.5-stage turbine Hot Gas Ingestion Rig shows the existence of pressure oscillation modes in the rim-seal-wheelspace cavity of a high pressure gas turbine stage with purge flow. The experimental results and observations are complemented by computational assessments of pressure oscillation modes associated with the flow in canonical cavity configurations. The cavity modes identified include shallow cavity modes and Helmholtz resonance. The response of the cavity modes to variation in design and operating parameters are assessed. These parameters include cavity aspect ratio, purge flow ratio, and flow direction defined by the ratio of primary tangential to axial velocity. Scaling the cavity modal response based on computational results and available experimental data in terms of the appropriate reduced frequencies appears to indicate the potential presence of a deep cavity mode as well. While the role of cavity modes on hot gas ingestion cannot be clarified based on the current set of data, the unsteady pressure field associated with turbine rim cavity modal response can be expected to drive ingress/egress.

Copyright © 2017 by ASME

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