Sinusoidal Excitation of a Free Turbulent Jet With Constant Amplitude Transverse Pressure Gradients Near the Nozzle Exit: Part I: Measurement of Mean Shear Velocities

[+] Author and Article Information
A. K. Stiffler

Department of Mechanical Engineering, Mississippi State University, State College, Miss.

J. L. Shearer

Systems and Controls Laboratory, The Pennsylvania State University, University Park, Pa.

J. Dyn. Sys., Meas., Control 95(2), 167-173 (Jun 01, 1973) (7 pages) doi:10.1115/1.3426674 History: Received March 16, 1973; Online July 13, 2010


A free turbulent jet is perturbed transverse to the flow direction by a sinusoidal pressure gradient near the nozzle exit. Velocities in the jet are determined by hot wire anemometer measurements. Moving effective mean velocity profiles are defined and reconstructed from the point-by-point stationary measurements of the mean velocity and of the harmonic content of the time varying signal. The effective velocity profiles are described by the Gaussian distribution function where the spread parameter decays as the cube of the product of the excitation frequency and the downstream location from the nozzle. These profile measurements and analysis of their characteristics lead to a better understanding of the factors determining the gain of a fluidic amplifier under conditions of high frequency operation.

Copyright © 1973 by ASME
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