Experiment on Gas Ingestion Through Axial-Flow Turbine Rim Seals
Author:
Roy R. P.1, Feng J.1, Narzary D.1, Paolillo R. E.2
Affiliation:
1. Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287-6106 2. Pratt & Whitney, East Hartford, CT 06108
Abstract
It has been suggested by researchers that ingestion, through rim seals, of mainstream gas into axial-flow turbine disk cavities is a consequence of the prevailing unsteady three-dimensional flow field. The cause–effect relationship is complex—to help understand it, experiments were performed in a model single-stage turbine rig using two different vane-blade configurations. Selected measurements from one of the configurations were reported earlier (1999–2001). The second configuration is new, featuring smaller numbers of vanes and blades and a larger vane turning angle. Selected measurements are presented and compared to those from the first configuration. The measurements include unsteady and rotor revolution time-average static pressure spatial distributions, and spatial distribution, in the rotor-stator cavity, of time-average ingestion. The parameters in the experiments were the main airflow rate, the purge/seal airflow rate, and the rotor speed. Unsteady three-dimensional CFD simulation may be helpful in identifying the roles of the many intertwined phenomena in the ingestion process.
Publisher
ASME International
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference16 articles.
1. Owen, J. M., and Rogers, R. H., 1989, Flow and Heat Transfer in Rotating-Disc Systems. Volume 1—Rotor–Stator Systems, Research Studies Press Ltd, Taunton, Somerset, England. 2. Dring, R. P., Joslyn, H. D., Hardin, L. W., and Wagner, J. H., 1982, “Turbine Rotor–Stator Interaction,” ASME J. Eng. Power, 104, pp. 729–742. 3. Green, T., and Turner, A. B., 1994, “Ingestion Into the Upstream Wheelspace of an Axial Turbine Stage,” ASME J. Turbomach., 116, pp. 327–332. 4. Johnson, B. V., Mack, G. J., Paolillo, R. E., and Daniels, W. A., 1994, “Turbine Rim Seal Gas Path Flow Ingestion Mechanisms,” AIAA Paper 94-2703. 5. Bohn, D., Rudzinski, B., Surken, N., and Gartner, W., 1999, “Influence of Rim Seal Geometry on Hot Gas Ingestion Into the Upstream Cavity of an Axial Turbine Stage,” ASME Paper 99-GT-248.
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