Stability of a U-shaped profile and combination of wind flow velocity 0-18 m/s

0426079 - ÚTAM 2014 CZ eng V - Research Report
Král, Radomil - Kuznetsov, Sergeii - Pospíšil, Stanislav - Buljac, Andrija
Stability of a U-shaped profile and combination of wind flow velocity 0-18 m/s.
Telč: Technische Universität Wien, 2013. 12 s.
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0060
Institutional support: RVO:68378297
Keywords : wind tunnel * aero-elastic stability * U-shaped profile
Subject RIV: JM - Building Engineering

The report presents experimental results regarding the aero-elastic stability of a U-shaped profile withan aspect-ratio (along wind length B, frontal height H) of B/H = 4.65. In the literature it can be found that a square prism (B/H =1) can perform galloping oscillations. However, this is not the case for a flat rectangular prism (B/H = 10). The aspect ratio of the U-beam under consideration here lies between these two values. Additionally, the asymetry of the profile possibly introduces interesting effects. In a comprehensive study of B/H = 4 rectangulsr prism, it is shown experimentally that vortex-induced as well as self-excited one-degree of freedom vibrations are possible. Our investigation aims at understanding the excitation mechanism and estimate critical velocities. Simulations and, more recently wind tunnel experiments are used in our investigations.
Permanent Link: http://hdl.handle.net/11104/0232079