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research-article

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

[+] Author and Article Information
Rachel A Berg

GE Aviation, Lynn, Massachusetts 01905
rachel.a.berg@gmail.com

Choon S. Tan

MIT Gas Turbine Laboratory, Cambridge, Massachusetts 02139
choon@mit.edu

Zhongman Ding

GE Power, Greenville, South Carolina, 29615
zhongman.ding@ge.com

Gregory M. Laskowski

GE Aviation, Lynn, Massachusetts, 01905
laskowsk@ge.com

Pepe Palafox

GE Aviation, Evendale OH 45215
palafoxp@ge.com

Rinaldo Miorini

GE GRC, Niskayuna, New York, 12309
rinaldo.miorini@ge.com

1Corresponding author.

ASME doi:10.1115/1.4038474 History: Received August 03, 2017; Revised September 05, 2017

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 (c) 2017 by ASME
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