Acoustically Induced Enhancement of Widening and Fluctuation Intensity in a Two-Dimensional Turbulent Jet

[+] Author and Article Information
F. O. Thomas

School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK

V. W. Goldschmidt

School of Mechanical Engineering, Purdue University, West Lafayette, IN

J. Fluids Eng 108(3), 331-337 (Sep 01, 1986) (7 pages) doi:10.1115/1.3242582 History: Received April 22, 1985; Online October 26, 2009


The enhancement of widening rate and turbulence intensity in a turbulent plane jet, due to an acoustic disturbance are considered. Detailed data at a representative Strouhal number suggest a well organized symmetric structural array in the initial region of the flow. These highly organized flow structures act as efficient agents in the transport of energy to the fine-grained turbulence, leading to greater diffusivity, enhanced turbulence and an increase in widening. The data also suggest significant differences in the underlying structure of the natural and excited jet flows, hence putting in jeopardy any generalization of coherent motions especially excited to facilitate their study.

Copyright © 1986 by ASME
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