Study of Upstream TravellingWaves in Transonic Buffet

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This paper investigates the appearance, propagation and orientation of upstream travelling waves (UTWs) in transonic buffet. Their role has been studied experimentally on a supercritical airfoil (OAT15A) in the transonic-supersonic wind tunnel of TU Delft at Mach number of 0.7, and an angle of attack of 3.5. In the experiments Background Oriented Schlieren (BOS) and Particle Image Velocimetry (PIV) have been used, to observe the suction side of the airfoil in a streamwise-spanwise oriented plane. The experiments detected the frequency and propagation velocity of the UTWs, which have been confirmed to behave as acoustic waves that therefore travel at the speed of sound relative to the flow. The particular set-up configuration used confirmed the two-dimensionality of the velocity field and of the shock wave but showed that the UTWs propagate in the plane of measurement with a non-zero orientation.
Original languageEnglish
Title of host publicationProceedings of the 13th International Symposium on Particle Image Velocimetry
Subtitle of host publication22-27 July, Munich, Germany
EditorsChristian J. Kähler, Rainer Hain, Sven Scharnowski, Thomas Fuchs
PublisherUniversitat der Bundeswehr Munchen
Number of pages11
ISBN (Electronic)978-3-943207-39-2
Publication statusPublished - 2019
Event13th International Symposium on Particle Image Velocimetry - Munchen, Germany
Duration: 22 Jul 201924 Jul 2019
Conference number: 13


Conference13th International Symposium on Particle Image Velocimetry
Abbreviated titleISPIV 2019


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