Title

Experimental Investigation Of Transitional Free Shear Layer Optics

Abstract

Measurements of Strehl ratio vs downstream distance, when a beam propagates through a shear layer (Reynolds number = 810/length), reveal minimal phase distortion in the pretransition region and a sudden decrease in the Strehl ratio when transition occurs. The Strehl ratio levels off to a constant asymptotic value (which is a function of the velocity ratio) in the post-transition region. The constant Strehl ratio (in the fully developed region) is attributed to fast mixing that occurs within the core of the vortices. Measurements in the post-transition region show that the Strehl ratio takes a U-shape profile when the velocity ratio is varied from 0.4 to 0.8. Results of mathematical simulation show that coherent structures may be modeled as a sinusoidal phase plate. © 1993 American Institute of Aeronautics and Astronautics, Inc., All rights reserved.

Publication Date

1-1-1993

Publication Title

AIAA Journal

Volume

31

Issue

12

Number of Pages

2290-2295

Document Type

Article

Identifier

scopus

Personal Identifier

scopus

DOI Link

https://doi.org/10.2514/3.11927

Socpus ID

0027834497 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0027834497

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