Abstract
In order to identify the influence of large-scale freestream turbulence on the transient loads occurring over an airfoil, surface pressures were measured at various chordwise and spanwise stations over a thin flat–plate airfoil. The turbulence intensity was varied from nominally smooth flow conditions (1.2%) to 12.3% while the integral length scale ranged from 0.15 m up to 1.3 m. The individual influence of turbulence intensity and integral length scale on the transient lift, pressure drag, pitching and rolling moments experienced by the airfoil was identified from these representative turbulence conditions. Increase in turbulence intensity resulted in a significant increase in the magnitude of force and pitching moment fluctuations experienced by the airfoil. Similar to the effect of changing turbulence intensity, increase in integral length scale also rendered an increase in lift and pressure drag fluctuations. However the rolling moment fluctuations were smaller at longer length scales. While the increase in force fluctuations at longer length scales has been attributed to the higher peak energy present at lower frequencies at longer length scales, the reduction in rolling moment was due to the increased lateral correlation of the oncoming turbulent eddies.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
