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

[+] Author and Article Information
K. Kaneko, T. Setoguchi

Department of Mechanical Engineering, Saga University, Saga, Japan

M. Inoue

Department of Mechanical Engineering, Power Division, Kyushu University, Fukuoka, Japan

J. Turbomach 113(4), 703-709 (Oct 01, 1991) (7 pages) doi:10.1115/1.2929137 History: Received January 18, 1990; Online June 09, 2008


Passive Control of the unstable characteristics of a high specific speed diagonal-flow fan has been proposed. It is possible to eliminate the unstable characteristics of the 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 a Göttingen 625 airfoil section. The mechanism of the passive control and the optimum geometric parameter are discussed on the basis of performance tests and internal flow measurements.

Copyright © 1991 by The American Society of Mechanical Engineers
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