Experimental Investigation Of Transitional Free Shear-Layer Optics

    Authors

    L. Chew;W. Christiansen

    Comments

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    Abbreviated Journal Title

    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.

    Journal 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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