Wind Tunnel Analysis of the Detachment Bubble on Bolund Island

The Science of Making Torque from Wind 2012

Yeow, T.S.^1 ; Cuerva, A.^1 ; Conan, B.^2 ; Pérez-Álvarez, J.^1

IDR/UPM, E.T.S.I. Aeronáuticos, Universidad Politécnica de Madrid, Madrid

E-28040, Spain^1

Von Karman Institute, Rhode-Saint-Genèse Belgium, Belgium^2

关键词: Atmospheric conditions;    Particle image velocimetries;    Recirculation regions;    Scale modeling;    Velocity field;    Vertical plane;    Wind directions;    Wind tunnel analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012021/pdf
DOI  :  10.1088/1742-6596/555/1/012021

来源: IOP

【 摘 要 】

The flow topology on two scaled models (1:230 and 1:115) of the Bolund Island is analysed in two wind tunnels, focusing on the characteristics of the detachment pattern when the wind blows from 270° wind direction and the atmospheric condition is neutral. Since the experiments are designed as the simplest possible reference cases, no additional roughness is added neither to the models surface nor to the wind tunnel floor. Pressure measurements on the surface of the 1:230 scale model are used to estimate the horizontal extension of the intermittent recirculation region, by applying the diagnostic means based in exploring the pressure statistics, proposed in the literature for characterising bubbles on canonical obstacles. The analysis is done for a range of Reynolds numbers based on the mean undisturbed wind speed, U∞and the maximum height of the island, h[5.1×104,8.5×104]. An isoheight mapping of the velocity field is obtained using 3D hotwire (3D HW). The velocity field in a vertical plane is determined using 3D HW and 2D particle image velocimetry (PIV) on the 1:115 scale model in order to reproduce and complete already existing results in the literature.