Open AccessExperimental study of the effect of turbulence on a section model blade oscillating in stall
Author(s) -
Amandolèse X.,
Széchényi E.
Publication year - 2004
Publication title -
wind energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 92
eISSN - 1099-1824
pISSN - 1095-4244
DOI - 10.1002/we.137
Subject(s) - airfoil , chord (peer to peer) , stall (fluid mechanics) , turbulence , pitching moment , angle of attack , wind tunnel , aerodynamics , aerodynamic center , mechanics , naca airfoil , reduced frequency , physics , reynolds number , structural engineering , engineering , computer science , distributed computing
This article highlights part of the recent static and dynamic section model tests performed on a NACA 63 4 _421 aerofoil for Reynolds numbers close to 10 6 and three flow turbulence levels, 1·1%, 4·5% and 7·5%. These tests were conducted in the 5 m × 3 m S4 wind tunnel at the Institut AéroTechnique, using an experimental rig which forces the section model to oscillate in pitch. An upwind grid was used to generate the higher turbulence intensities characterized by turbulence length scales smaller than the chord of the aerofoil. The aerofoil's static characteristics were measured at angles of attack ranging from 0° to 30°. In the dynamic tests the aerofoil was made to oscillate in pitch around its fore quarter‐chord line at different values of mean angle of attack (below, in and beyond the static stall region), reduced frequency (ranging from 0·0183 to 0·183) and amplitude of motion (from 2° to 8°). For all tests the aerodynamic loads were obtained through unsteady surface pressure measurements. The unsteady lift, pitching moment and pressure distributions are analysed and the effects of both the motion characteristics and the turbulence level of the incident flow are highlighted. Copyright © 2004 John Wiley & Sons, Ltd.