The investigation focused on the conversions of flow structures with a change in angle of attack (AOA) for a flexible cantilever wing, which experienced a self-excited vibration. Stereoscopic particle imaging velocimetry (Stereo-PIV) was utilized to measure the velocity field in the wing-tip region as AOA varied from 0 deg to 12 deg. At the Reynolds number (Re) of 3 × 104, instability waves shedding from the wing were amplified as they propagated and developed into Karman Vortex Street in the far downstream region at low AOAs (AOA = 4 deg and 6 deg). As AOA increased to 8 deg with the wing model was still steady, the Karman Vortex Street no longer existed. The wing started to vibrate at AOA = 10 deg owing to the self-excited vibration, and the Karman Vortex Street appeared again. The inception location of the Karman Vortex Street moved further upstream than in the cases at AOA = 4 deg and 6 deg. A new vortex structure, secondary vortex-pairs, appears outside the main wing-tip vortex (WTV).
Flow Over the Tip Region of a Flexible Cantilever Wing With the Effect of Angle of Attack
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received June 28, 2018; final manuscript received January 24, 2019; published online March 18, 2019. Assoc. Editor: Hui Hu.
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Hu, Y., Liu, X., Shyy, W., and Qiu, H. (March 18, 2019). "Flow Over the Tip Region of a Flexible Cantilever Wing With the Effect of Angle of Attack." ASME. J. Fluids Eng. September 2019; 141(9): 094501. https://doi.org/10.1115/1.4042667
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