Experimental Measurement of Alford’s Force in Axial Flow Turbomachinery

[+] Author and Article Information
J. M. Vance

Texas A&M University, College Station, Texas 77843

F. J. Laudadio

Motorola Corporation

J. Eng. Gas Turbines Power 106(3), 585-590 (Jul 01, 1984) (6 pages) doi:10.1115/1.3239610 History: Received January 09, 1984; Online October 15, 2009


This paper presents the results of experimental measurements made on a small, high-speed, axial-flow test apparatus to verify the existence of Alford’s force and to investigate the validity of his mathematical prediction model. The measurements show that the cross-coupled aerodynamic force is linearly proportional to rotor eccentricity, and to stage torque, as predicted by Alford’s theory. However, it was found that the force is also speed-dependent, and that the inlet flow conditions to the stage have a pronounced effect. For some special combinations of rotor speed and stage torque, the direction of the force is reversed.

Copyright © 1984 by ASME
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