Turbulence as a Producer of Noise in Proportional Fluid Amplifiers

[+] Author and Article Information
D. W. Prosser, M. J. Fisher

IIT Research Institute, Chicago, Ill.

J. Appl. Mech 33(4), 728-734 (Dec 01, 1966) (7 pages) doi:10.1115/1.3625175 History: Received March 22, 1965; Revised February 14, 1966; Online September 15, 2011


A theory was developed to predict the signal and noise, in terms of stagnation pressures, at the entrance to a blocked rectangular receiver placed in an otherwise free two-dimensional turbulent jet. Experimental verification of the theory was then undertaken. The results showed that a reversal of flow takes place within the entrance of a blocked receiver, so that stagnation conditions do not exist at the entrance and, hence, the theory is not valid under these conditions. The theory was easily altered to predict the momentum flux through a receiver which presents very little resistance to flow through its passageway. Employing a device called a momentum meter the altered theory was verified. The main results of this work are: (a) The noise-to-signal ratio of a receiver held fixed in the jet is minimized by keeping the receiver near the centerline of the jet. (b) The ratio of noise to change in signal, with relative movement between the jet and receiver, is minimized by keeping the receiver away from the centerline of the power jet.

Copyright © 1966 by ASME
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