Author:
DIMOTAKIS P. E.,CATRAKIS H. J.,FOURGUETTE D. C.
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.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
83 articles.
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