Original title: Aerodynamic coefficients and pressure distribution on U-beams with porous flanges
Authors: Macháček, Michael ; Hračov, Stanislav ; Dejmal, Karel
Document type: Papers
Conference/Event: Engineering mechanics 2025. International conference /31./, Medlov (CZ), 20250512
Year: 2025
Language: eng
Abstract: This study presents the results of wind tunnel experiments on U-shaped beams with either solid flanges or flanges with 50% porosity. Aerodynamic drag and lift coefficients, along with pressure coefficient distributions on the beam surfaces, were evaluated and compared for both configurations. The findings demonstrate that flange porosity significantly affects the aerodynamic forces and flow around the U-beam. Across most angles of attack, the solid-flange beam exhibited higher drag than the porous-flange beam. However, within the range of approximately −11.5° to −5.5°, the porous configuration showed higher drag. Furthermore, at negative angles of attack, the lift force on the porous-flanged beam acted in the opposite direction to that on the solid-flanged beam. Finally, incorporating flange porosity reduced the magnitude of suction pressures on both the top and bottom surfaces of the U-beam.
Keywords: aerodynamic coefficients; porous flanges; pressure coefficients; U-shaped beam; wind tunnel testing
Project no.: GA24-13061S (CEP)
Funding provider: GA ČR
Host item entry: Engineering mechanics 2025. Book of full texts, ISBN 978-80-86246-96-3, ISSN 1805-8248

Institution: Institute of Theoretical and Applied Mechanics AS ČR (web)
Document availability information: Fulltext is available in the digital repository of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0366375

Permalink: http://www.nusl.cz/ntk/nusl-679010


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