Unsteady aerodynamic forces measured on a fluttering profil

0392263 - ÚT 2014 CZ eng A - Abstract
Vlček, Václav - Zolotarev, Igor - Kozánek, Jan
Unsteady aerodynamic forces measured on a fluttering profil.
ENGINEERING MECHANICS 2013. Praha: Insitute of Thermomechanics ASCR, v. v. i., 2013 - (Zolotarev, I.). s. 167-168. ISBN 978-80-87012-46-8. ISSN 1805-8248.
[Engineering Mechanics 2013 /19./. 13.05.2013-16.05.2013, Svratka]
R&D Projects: GA ČR GA13-10527S
Institutional support: RVO:61388998
Keywords : aeroelastic experiments * self-excited vibrations * fluttering profile
Subject RIV: JU - Aeronautics, Aerodynamics, Aircrafts

The evaluations of optical measurements of the flow field near the fluttering profile NACA0015 with two-degrees of freedom are presented. Mach number of the airflow was M = 0.21 and M = 0.45, the boundaries of the flutter occurrence. Aerodynamic forces acting on the profile were evaluated in the drag and lift components which enabled to obtain independently the forces corresponding to the upper and lower surfaces of the profile. Using the mentioned decomposition, the new information about mechanism of flutter properties was obtained. The force effects on the upper and lower surfaces are in opposite phases and they are partially eliminated as a result of the circulation around the profile. The cycle changes of this forces cause the permanent energy contribution from the airflow to the vibrating system.
Permanent Link: http://hdl.handle.net/11104/0225178