Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Evaluation of Interferograms of Unsteady Subsonic Airflow Past a Fluttering Airfoil
Šidlof P., Riss Š., Vlček V.
Abstract:
The paper reports on time-resolved interferometric measurements of unsteady flow fields around a uttering NACA0015 airfoil. A mechanical model with two degrees of freedom (pitch and plunge) has been designed and tested in a high-speed subsonic wind tunnel. Aeroelastic instability of the classical utter and dynamic stall type has been observed in the Mach number range M = 0.2 - 0.5. The interferograms were recorded using a Mach-Zehnder interferometer and a high-speed camera. An in-house software IFGPro was developed for the postprocessing and evaluation of the interferogram sequences, yielding pressure distribution, lift and drag force on the airfoil.
Keywords:
interferometry, flow-induced vibration, dynamic stall, NACA0015 airfoil

Fulltext: PDF DOI: http://dx.doi.org/10.14311/TPFM.2016.030

In Proceedings Topical Problems of Fluid Mechanics 2016, Prague, 2016 Edited by David Šimurda and Tomáš Bodnár, pp. 223-228 ISBN 978-80-87012-58-1 (Print) ISSN 2336-5781 (Print)