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RESEARCH PAPERS

High-Cycle Fatigue Design Evolution and Experience of Free-Standing Combustion Turbine Blades

[+] Author and Article Information
A. J. Scalzo

Combustion Turbines, Westinghouse Electric Corporation, Orlando, FL 32826-2399

J. Eng. Gas Turbines Power 114(2), 284-292 (Apr 01, 1992) (9 pages) doi:10.1115/1.2906585 History: Received January 29, 1991; Online April 24, 2008

Abstract

Combustion turbine blade design criteria can generally be classified as either temperature or fatigue related. Since less is usually known about the factors influencing the fatigue phenomenon, it is considered the more challenging. In addition, as analytical and experimental techniques became more sophisticated and more accurate, the natural tendency was to replace archaic “guidelines” or “rules” with less conservative approaches that at times led to the discovery of new high-cycle fatigue “thresholds.” This paper presents the evolution of the combustion turbine blade high cycle fatigue design criteria for free-standing blades. It also presents the analysis and corrective actions taken to resolve several unique combustion turbine blade fatigue problems, all encountered over a 35-year period while the author has been employed at Westinghouse Electric Corporation. Included are high-cycle fatigue problems due to cooling air leakage, seal pin friction, and combustion temperature maldistribution, as well as flow-induced nonsynchronous vibration.

Copyright © 1992 by The American Society of Mechanical Engineers
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