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Proceedings Paper

Application Of Digital Holographic Interferometry To Pressure Measurements Of Symmetric, Supercritical, And Circulation Control Airfoils In Transonic Flow Fields
Author(s): Francisco J. Torres
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Paper Abstract

Six airfoil interferograms were evaluated using a semi-automatic image processor system which digitizes, segments, and extracts the fringe coordinates along a polygonal line. The resulting fringe order function was converted into density and pressure distributions and a comparison was made with pressure transducer data at the same wind tunnel test conditions. Three airfoil shapes were used in the evaluation to test the capabilities of the image processor with a variety of flows. Symmetric, supercritical, and circulation control airfoil interferograms provided fringe patterns with shocks, separated flows, and high-pressure regions for evaluation. Regions along the polygon line with very clear fringe patterns yielded results within 1 % of transducer measurements, while poorer quality regions, particularly near the leading and trailing edges, yielded results that were not as good.

Paper Details

Date Published: 8 December 1986
PDF: 18 pages
Proc. SPIE 0693, High Speed Photography, Videography, and Photonics IV, (8 December 1986); doi: 10.1117/12.936744
Show Author Affiliations
Francisco J. Torres, NASA/Ames Research Center (United States)

Published in SPIE Proceedings Vol. 0693:
High Speed Photography, Videography, and Photonics IV
Bernard G. Ponseggi, Editor(s)

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