An Approximate Analysis of the Unsteady Lift on Airfoils in Cascade

[+] Author and Article Information
R. E. Henderson

Ordnance Research Laboratory, Pennsylvania State University, State College, Pa.

J. H. Horlock

Engineering Laboratory, Cambridge University, Cambridge, England

J. Eng. Power 94(4), 233-240 (Oct 01, 1972) (8 pages) doi:10.1115/1.3445678 History: Received November 09, 1971; Online July 14, 2010


An approximate analysis is presented for determining the unsteady lift on airfoils in moving cascades, subject to disturbances in the inlet axial flow. The equations of motion are averaged across the pitch, and the mean pressure in each channel and the pressure difference across it are obtained. The lift on a reference blade dividing two blade channels is then estimated. The analysis is limited to flows in which the frequency parameter based on blade pitch is small, and to blading of low lift coefficient. Comparisons are given with earlier analyses, for flow past isolated airfoils (Sears), for quasi-steady flows through cascades (Gearhart, et al.), and for flow through an actuator disk of small blade chord and flow through cascades of flat blades (Whitehead).

Copyright © 1972 by ASME
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