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On Mixing and Structure of the Concentration Field of Turbulent Jets

Dowling, David R. and Dimotakis, Paul E. (1988) On Mixing and Structure of the Concentration Field of Turbulent Jets. In: AIAA/ASME/SIAM/APS 1st Fluid Dynamics Conference. AIAA , New York, NY.

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This work is an investigation of the mixing of the nozzle fluid of a round turbulent jet with the entrained reservoir fluid, using laser-Rayleigh scattering methods. Our measurements, at a Reynolds number of 5000, cover the axial range from 20 to 80 jet exit diameters and resolve the full range of temporal & spatial concentration scales. The measured mean & rms values of the concentration, and the mean scalar dissipation rate, when estimated from the time derivative of concentration, are consistent with jet similarity laws. Concentration fluctuation power spectra are found to be self-similar along rays emanating from the jet virtual origin. The probability density functions for the concentration, the time derivative of concentration, and the square of the time derivative of concentration, are compiled and are also self-similar along rays.

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Additional Information:Copyright © 1988 by David R. Dowling. Published by the American Institute of Aeronautics and Astronautics Inc. with permission. 88-3611-CP. The authors wish to ac:knowledge Dr. Daniel B. Lang for his assistance in the design and fabrication of the whole data acquisition system. This work was supported by the Gas Research Institute grant #5083-260-0870 and the Air Force Office of Scientific Research contract # 83-0213.
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Gas Research Institute5083-260-0878
Air Force Office of Scientific Research (AFOSR)83-0213
Record Number:CaltechAUTHORS:20141020-154527512
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50582
Deposited By: Kristin Buxton
Deposited On:21 Oct 2014 15:39
Last Modified:10 Nov 2021 18:57

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