Averaging Methods for Determining the Performance of Large Fans from Field Measurements

[+] Author and Article Information
P. M. Gerhart

The University of Akron, Akron, Ohio 44325

J. Eng. Power 103(2), 345-347 (Apr 01, 1981) (3 pages) doi:10.1115/1.3230727 History: Received January 28, 1980; Online November 09, 2009


When testing large fans in the field, it is often necessary to make measurements at locations where the distributions of gas velocity, pressure, and temperature are highly irregular. When this occurs the fan pressure rise or fan specific energy is usually expressed in terms of average values of pressure, density, and temperature. This paper proposes criteria for the definition of such averages and develops defining equations for them. The averages proposed allow the continuity, energy, and ideal gas state equations to be written in simple one-dimensional form without correction factors. Performance variables such as total pressure are defined in the customary way from the averages of the fundamental flow properties.

Copyright © 1981 by ASME
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