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Optical Engineering

Focused Shadowgraph Visualization of Boundary-Layer Transition in Aeroballistic Range Studies*
Author(s): O. H. Bock
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Paper Abstract

Focused shadowgraph systems employing schlieren quality optics have been used successfully in AEDC Ranges G and K to study the location of transition from laminar to turbulent flow in the boundary layers of test models. A spark light source proved advantageous in flow visualization studies of relatively low velocity models, while a pulsed ruby laser with its very short exposure time (20 nanoseconds) allowed excellent stop-motion shadowgraph photography at higher speeds. Use of the pulsed laser also allowed the preliminary evaluation of a combination front light/focused shadowgraph system - a unique instrumentation system in ballistic range application, to the best of the author's knowledge.

Paper Details

Date Published: 1 April 1974
PDF: 4 pages
Opt. Eng. 13(2) doi: 10.1117/12.7971688
Published in: Optical Engineering Volume 13, Issue 2
Show Author Affiliations
O. H. Bock, ARO, Inc. (United States)

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