Application Of Digital Holographic Interferometry To Pressure Measurements Of Symmetric, Supercritical, And Circulation Control Airfoils In Transonic Flow Fields

Francisco J. Torres

doi:10.1117/12.936744

8 December 1986 Application Of Digital Holographic Interferometry To Pressure Measurements Of Symmetric, Supercritical, And Circulation Control Airfoils In Transonic Flow Fields

Francisco J. Torres

Author Affiliations +

Proceedings Volume 0693, High Speed Photography, Videography, and Photonics IV; (1986) https://doi.org/10.1117/12.936744
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

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.

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Francisco J. Torres "Application Of Digital Holographic Interferometry To Pressure Measurements Of Symmetric, Supercritical, And Circulation Control Airfoils In Transonic Flow Fields", Proc. SPIE 0693, High Speed Photography, Videography, and Photonics IV, (8 December 1986); https://doi.org/10.1117/12.936744

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