Effect of Time-Dependent Flight Loads on Turbofan Engine Performance Deterioration

[+] Author and Article Information
B. L. Lewis

Teledyne CAE, Toledo, Ohio 43612

A. Jay

United Technologies Corporation, Pratt & Whitney Aircraft Group, Commercial Products Division, East Hartford, Conn. 06108

E. G. Stakolich

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135

J. Eng. Power 104(3), 692-697 (Jul 01, 1982) (6 pages) doi:10.1115/1.3227333 History: Received September 23, 1980; Revised December 23, 1980; Online September 28, 2009


A jet engine’s efficiency is strongly dependent upon clearances between rotating blades and the corresponding stationary gas-path seals. Analytical studies to examine the effects of various flight cycle loads on powerplant clearances suggest that rotor/seal interferences may contribute to the short-term performance deterioration exhibited by all high bypass jet propulsion systems. In prior analytical studies, flight cycle loads were treated in a quasi-steady, static manner, even though some flight cycle loadings are decidedly dynamic in nature. Gust encounters and aircraft landings are classical examples of dynamic flight loads found in typical airline service. An analytical technique for predicting the effects of aircraft dynamic flight loads on engine performance was developed and is described herein.

Copyright © 1982 by ASME
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