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    Bai, Chi-Jeng Wang, Wei-Cheng and Chen, Po-Wei 2016. The Effects of Sinusoidal Leading Edge of the Turbine Blade on the Power Coefficient of Horizontal-Axis Wind Turbine (HAWT). International Journal of Green Energy,

    Liu, Yi-Chung and Hsiao, Fei-Bin 2014. Experimental Investigation on Critical Reynolds Numbers Aerodynamic Properties of Low Aspect Ratios Wings. Procedia Engineering, Vol. 79, p. 76.

    Hsiao, Fei-Bin Bai, Chi-Jeng and Chong, Wen-Tong 2013. The Performance Test of Three Different Horizontal Axis Wind Turbine (HAWT) Blade Shapes Using Experimental and Numerical Methods. Energies, Vol. 6, Issue. 6, p. 2784.


Aerodynamic Investigations of Low-Aspect-Ratio Thin Plate Wings at Low Reynolds Numbers

  • Y.-C. Liu (a1) and F.-B. Hsiao (a1)
  • DOI:
  • Published online: 22 March 2012

To realize the relationship between flow structures of wingtip vortices and post stall characteristics of low aspect-ratio wings, this paper experimentally studies the aerodynamic characteristics and the corresponding flow structures of the rectangular thin-plate wings at Reynolds numbers between 104 and 105. The aerodynamic properties to be studied include lift, drag, slopes at linear and nonlinear range of the lift curves and lift-to-drag ratios of the tested wings with the aspect ratio varying from 1.0 to 3.0. The flow structures regarding the leading-edge separation vortices and wingtip vortices at upper surface and near-wake regions of the wings are also investigated by smoke-wire visualization. Results indicate that the high stall angle of attack and vortex lift are clearly manifested to induce the nonlinear increase in the lift curves as the aspect ratio reaches less than 1.6. This phenomenon is specifically observed to augment the aerodynamic properties with the decrease of the aspect ratio. Additionally, the corresponding flow visualization also indicates that the wingtip vortices and the areas of highly affected regions are duly increased with the increase of the angle of attack up to 40°, which makes certain that the extra increase of the nonlinear lift results from these vortices. This result can be practically applied to the planform design for unmanned aerial vehicles.

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2. G. E. Torres and T. J. Mueller , “Low-Aspect-Ratio Wing Aerodynamics at Low Reynolds Numbers,” AIAA Journal, 42, pp. 865873 (2004).

3. T. J. Mueller , “The Influence of Laminar Separation and Transition on Low Reynolds Number Airfoil Hysteresis,” Journal of Aircraft, 22, pp. 763770 (1985).

9. G. E. Bartlett and R. J. Vidal , “Experimental Investigation of Influence of Edge Shape on the Aerodynamic Characteristics of Low-Aspect-Ratio Wings at Low Speed,” Journal of Aeronautical Sciences, 22, pp. 517533 (1955).

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Journal of Mechanics
  • ISSN: 1727-7191
  • EISSN: 1811-8216
  • URL: /core/journals/journal-of-mechanics
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