Title

Experimental Investigation Of Transitional Free Shear-Layer Optics

Title - Alternative

Aiaa J.

Keywords

Engineering, Aerospace

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.

Publication Title

Aiaa Journal

Volume

31

Issue/Number

12

Publication Date

1-1-1993

Document Type

Article

Language

English

First Page

2290

Last Page

2295

WOS Identifier

WOS:A1993MK13500015

ISSN

0001-1452

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