Passive Control of Unstable Characteristics of a High Specific Speed Diagonal-Flow Fan by an Annular Wing FREE

[+] Author Affiliations
Kenji Kaneko, Toshiaki Setoguchi

Saga University, Saga, Japan

Masahiro Inoue

Kyushu University, Fukuoka, Japan

Paper No. 90-GT-159, pp. V001T01A055; 7 pages
  • ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Brussels, Belgium, June 11–14, 1990
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7904-7
  • Copyright © 1990 by ASME


A passive control of an unstable characteristics of a high specific speed diagonal-flow fan has been proposed. It is possible to eliminate the unstable characteristics of pressure-flow rate curve in a low flow region without deterioration of performance at design point. The control action is done naturally (passively) without any energy input. The inlet nozzle of an ordinary diagonal-flow fan was replaced by an annular wing with Göttingen 625 airfoil section. The mechanism of the passive control and the optimum geometrical parameter are discussed on the basis of the performance tests and internal flow measurements.

Copyright © 1990 by ASME
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