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Flow structure and optical beam propagation in high-Reynolds-number gas-phase shear layers and jets

Dimotakis, P. E. and Catrakis, H. J. and Fourguette, D. C. (2001) Flow structure and optical beam propagation in high-Reynolds-number gas-phase shear layers and jets. Journal of Fluid Mechanics, 433 . pp. 105-134. ISSN 0022-1120. http://resolver.caltech.edu/CaltechAUTHORS:DIMjfm01

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Abstract

We report on the structure of the scalar index-of-refraction field generated by turbulent, gas-phase, incompressible and compressible shear layers and incompressible jets, and on associated beam-propagation aero-optical phenomena. Using simultaneous imaging of the optical-beam distortion and the turbulent-flow index-of-refraction field, wavefront-phase functions were computed for optical beams emerging from the turbulent region in these free-shear flows, in an aero-optical regime producing weak wavefront distortions. Spatial wavefront-phase behaviour is found to be dominated by the large-scale structure of these flows. A simple level-set representation of the index-of-refraction field in high-Reynolds-number, incompressible shear layers is found to provide a good representation of observed wavefront-phase behaviour, indicating that the structure of the unsteady outer boundaries of the turbulent region provides the dominant contributions.


Item Type:Article
Additional Information:©2001 Cambridge University Press. Received 6 May 1999 and in revised form 16 October 2000. This work was sponsored by AFOSR Grant F49620-94-1-0283 and completed under F49620-98-1-0052 and F49620-00-1-0036. We would like to acknowledge the expert assistance by Earl Dahl in the execution of both the shear-layer and jet experiments, Dan Lang for the design of the data-acquisition and computer-network systems that were essential for this work, the help of Pavel Svitek with some of the figures, Michael Slessor for his participation in the shear-layer experiments that generated the matching Schlieren images and his assistance with the text, and Omer Savas for assistance with the text.
Subject Keywords:LARGE-SCALE STRUCTURES; TURBULENT JETS; MIXING LAYER; DISTORTION; FIELD
Record Number:CaltechAUTHORS:DIMjfm01
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:DIMjfm01
Alternative URL:http://journals.cambridge.org/action/displayIssue?iid=78552
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5542
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:24 Oct 2006
Last Modified:26 Dec 2012 09:13

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