کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
794012 | 902460 | 2010 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The manipulation of trailing-edge vortices for an airfoil in plunging motion The manipulation of trailing-edge vortices for an airfoil in plunging motion](/preview/png/794012.png)
Trailing-edge vortex manipulation has been investigated using particle image velocimetry (PIV) for an airfoil undergoing harmonic plunging superimposed with a pitching motion near the bottom of the stroke. The so-called quick-pitch motion has been evaluated through a comparison with a benchmark pure-sinusoidal plunge motion for Re=30000 and k=0.25k=0.25. It has been shown that the trailing-edge vortex circulation can be reduced by more than 60% for all quick-pitch cases. The reduction in trailing-edge vortex circulation has been achieved without diminishing the strength of the leading-edge vortex, thus maintaining the lift augmentation achieved through dynamic stall. The improvement over the benchmark case is then confirmed through a statistical analysis. Finally, an analysis of the flow separation over the airfoil shows that the various quick-pitch motions facilitate earlier flow reattachment at the bottom of the stroke.
Journal: Journal of Fluids and Structures - Volume 26, Issue 2, February 2010, Pages 193–204