Soap bubbles for large-scale PIV in industrial wind tunnels

David Engler Faleiros, Marthijn Tuinstra, Bart D. van Rooijen, Fulvio Scarano, Andrea Sciacchitano

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This work evaluates the use of helium-filled soap bubbles (HFSB) for Particle Image Velocimetry (PIV) measurements at high Reynolds numbers (up to 3.2 million) in aeronautics. The measurements are performed in the Low Speed Tunnel (LST) of the German-Dutch Wind Tunnels (DNW) using a high-lift airfoil in close-to-stall conditions up to 70 m/s. Experiments using Di-ethylhexyl- sebacat (DEHS) particles are performed for a comparison of the two seeding techniques. The signal to noise ratio of HFSB images was two orders of magnitude larger than that of DEHS, which strongly reduced the unwanted effects of background reflections and light intensity spatial variations, compared to DEHS particle images. The mean velocity field obtained with HFSB exhibits differences typically within 1% of the free stream velocity, when compared to DEHS measurements.
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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