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Unseeded Velocity Measurements Around a Transonic Airfoil Using Femtosecond Laser Tagging

Ross A. Burns

NASA Langley Research Center, Hampton, Virginia 23681

*Research Engineer, National Institute of Aerospace. Member AIAA.

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and

Paul M. Danehy

NASA Langley Research Center, Hampton, Virginia 23681

†Senior Researcher, Advanced Measurements and Data Systems Branch. Associate Fellow AIAA.

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Published Online:31 Oct 2017https://doi.org/10.2514/1.J056154

Abstract

Femtosecond laser electronic excitation tagging velocimetry was used to study the flowfield around a symmetric, transonic airfoil in the NASA Langley Research Center’s 0.3 m transonic cryogenic tunnel facility. A nominal Mach number of 0.85 was investigated with a total pressure of 125 kPa and a total temperature of 280 K. Two components of velocity were measured along vertical profiles at different locations above, below, and aft of the airfoil at angles of attack of 0 and 7 deg. Velocity profiles within the wake showed sufficient accuracy, precision, and sensitivity to resolve both the mean and fluctuating velocities and general flow physics, such as shear-layer growth. Evidence of flow separation was found at high angles of attack. Velocity measurements were assessed for their accuracy, precision, dynamic range, spatial resolution, and overall measurement uncertainty as they relate to the present experiments. Measurement precisions as low as $1 m / s$ were observed, whereas the velocity dynamic range was found to be nearly a factor of 500. The spatial resolution of between 1 and 5 mm was found to be primarily limited by the femtosecond laser electronic excitation tagging spot size and advection of the flow. Overall measurement uncertainties ranged from 3 to 4%.

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Volume 55, Number 12December 2017

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Copyright © 2017 by Ross Burns and United States Government as represented by the Administrator of the National Aeronautics and Space Administration. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the ISSN 0001-1452 (print) or 1533-385X (online) to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.

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Acknowledgments

This work was funded through the NASA Langley Research Center’s Internal Research and Development program as well as the Aeronautics Evaluation and Testing Capabilities program, which is part of the Advanced Air Vehicles Program in the NASA Aeronautics Research Mission Directorate. The authors would like to thank all of the expert staff at the NASA Langley Research Center’s 0.3 m transonic cryogenic tunnel, including Wes Goodman, Michael Chambers, Karl Maddox, Cliff Obara, Chris Cramer, Reggie Brown, Gary Beachem, and Lynn Bobbitt. These tests would not have been possible without the long hours and hard work everyone contributed. Additional thanks are given to Lonnie Brown and Doug Webber for their input in the design and assessment of the test model and to Joe Morrison, Greg Jones, and Bill Milholen from NASA Langley Research Center for their helpful discussions in choosing the test geometry. Finally, the authors would like to thank Mark Kulick for his role in fabricating the window and model mounting system, as well as other mechanical equipment necessary for these tests.

Received19 April 2017
Accepted14 July 2017
Published online31 October 2017

Unseeded Velocity Measurements Around a Transonic Airfoil Using Femtosecond Laser Tagging

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