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Measurements of Entrainment and Mixing in Turbulent Jets

Dahm, W. A. and Dimotakis, P. E. (1985) Measurements of Entrainment and Mixing in Turbulent Jets. In: 23rd Aerospace Sciences Meeting. , Reno, NV. http://resolver.caltech.edu/CaltechAUTHORS:20170731-105835407

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Abstract

An experimental investigation of entrainment and mixing in the self-similar far field of an axisymmetric free turbulent jet in water is presented. Length and time scales for the flame length fluctuations of reacting jets are shown to be approximately equal to the local characteristic large scale length and time of the flow. It is also shown that instantaneous radial profiles of concentration across the jet do not resemble the mean concentration profile, indicating that the mean profile is a poor representation of the mixed fluid states within the jet. These instantaneous profiles also show that unmixed ambient fluid is transported throughout the entire extent of the jet, and that the mixed fluid composition within the jet can be fairly uniform in regions extending across a large part of the local jet diameter. Lastly, the amount of unmixed ambient fluid on the jet centerline is found to vary roughly periodically with a period approximately equal to the local characteristic large scale time of the flow. These results suggest that large scale transport mechanisms, displaying a characteristic organization, play an important role in entrainment and mixing in the far filed of turbulent jets.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.1985-56DOIArticle
https://arc.aiaa.org/doi/10.2514/6.1985-56PublisherArticle
http://resolver.caltech.edu/CaltechAUTHORS:20160602-173708153Related ItemArticle
Additional Information:© 1984 Werner J.A. Dahm.
Group:GALCIT
Record Number:CaltechAUTHORS:20170731-105835407
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170731-105835407
Official Citation:MEASUREMENTS OF ENTRAINMENT AND MIXING IN TURBULENT JETS W.A. DAHM and P.E. DIMOTAKIS 23rd Aerospace Sciences Meeting. Reno,NV,U.S.A..
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79594
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Aug 2017 19:49
Last Modified:01 Aug 2017 19:49

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