An Investigation Into the Dynamic Performance of a Variable Pitch Turbofan Using a Hybrid Computer PUBLIC ACCESS

[+] Author Affiliations
B. D. MacIsaac

National Research Council, Ottawa, Canada

H. I. H. Saravanamuttoo

Carleton University, Ottawa, Canada

Paper No. 76-GT-31, pp. V01AT01A031; 11 pages
  • ASME 1976 International Gas Turbine and Fluids Engineering Conference
  • Volume 1A: General
  • New Orleans, Louisiana, USA, March 21–25, 1976
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7974-0
  • Copyright © 1976 by ASME


This paper discusses the results of a study of the dynamic performance of a hypothetical variable pitch turbofan; the study was conducted via a hybrid computer simulation of the engine dynamics. It was found that, by change of fan pitch, the steady-state thrust could be held constant over a wide range of fan speeds. The variable pitch fan could contribute only marginally to improving transient response, by utilizing the stored “flywheel” energy which can be extracted by increasing pitch during the transient. This is made possible by maintaining high fan speeds at low thrust by an appropriate selection of initial pitch. Such operation may cause significant excursions in fan speed, and control by pitch variation may require some increase in the complexity of the engine control system.

Copyright © 1976 by ASME
Topics: Computers , Turbofans
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