کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
792489 | 902148 | 2010 | 18 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of pre-strain and excess length on unsteady fluid–structure interactions of membrane airfoils Effect of pre-strain and excess length on unsteady fluid–structure interactions of membrane airfoils](/preview/png/792489.png)
Aerodynamic characteristics of two-dimensional membrane airfoils were experimentally investigated in a wind tunnel. The effects of the membrane pre-strain and excess length on the unsteady aspects of the fluid–structure interaction were studied. The deformation of the membrane as a function of angle of attack and free-stream velocity was measured using a high-speed camera. These measurements were complemented by the measurements of unsteady velocity field with a high frame-rate Particle Image Velocimetry (PIV) system as well as smoke visualization. Membrane airfoils with excess length exhibit higher vibration modes, earlier roll-up of vortices, and smaller separated flow regions, whereas the membranes with pre-strain generally behave more similarly to a rigid airfoil. Measured frequencies of the membrane vibrations suggest a possible coupling with the wake instabilities at high incidences for all airfoils.
Journal: Journal of Fluids and Structures - Volume 26, Issue 3, April 2010, Pages 359–376