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

Published online by Cambridge University Press:  22 March 2012

Y.-C. Liu  and
F.-B. Hsiao
Y.-C. Liu*
Affiliation:
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C.
F.-B. Hsiao
Affiliation:
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C.
*
*Corresponding author (p4894105@mail.ncku.edu.tw)
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Abstract

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.

Keywords

Post stallLeading-edge separation vorticesWingtip vorticesThin-plate wing
Type
Articles
Information
Journal of Mechanics , Volume 28 , Issue 1 , March 2012 , pp. 77 - 89
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2012

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References

REFERENCES

1. Polhamus, E. C., “A Concept of the Vortex Lift of Sharp-edge Delta Wings Based on a Leading-edgesuction Analogy,” Technical Report TND-3767, NASA (1966).Google Scholar
2. Torres, G. E. and Mueller, T. J., “Low-Aspect-Ratio Wing Aerodynamics at Low Reynolds Numbers,” AIAA Journal, 42, pp. 865–873 (2004).CrossRefGoogle Scholar
3. Mueller, T. J., “The Influence of Laminar Separation and Transition on Low Reynolds Number Airfoil Hysteresis,” Journal of Aircraft, 22, pp. 763–770 (1985).CrossRefGoogle Scholar
4. Hsiao, F. B., Lin, C. Y., Liu, Y. C. and Wang, D. B., “Thickness Effect on Low-aspect-ratio Wing Aerodynamic Characteristics at a Low Reynolds Number,” Journal of Mechanics, 24, pp. 223–228 (2008).CrossRefGoogle Scholar
5. Anderson, J. D. Jr., Fundamentals of Aerodynamics, McGraw-Hill Higher Education, Third Edition, pp. 361–366 (2001).Google Scholar
6. Julius, S. B. and Allan, G. P., Random Data Analysis and Measurement Procedures, A Wiley-Interscience Publication, Third Editions, pp. 86–115 (2000).Google Scholar
7. Torres, G. E. and Mueller, T. J., “Aerodynamic Characteristics of Low Aspect Ratio Wings at Low Reynolds Numbers,” AIAA Journal, 195, pp. 115–140 (2001).Google Scholar
8. Lowry, J. G. and Polhamus, E. C., “A Method for Predicting Lift Increments due to Flap Deflection at Low Angles of Attack in Incompressible Flow,” NACA TN 3911 (1957).Google Scholar
9. Bartlett, G. E. and Vidal, R. J., “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. 517–533 (1955).CrossRefGoogle Scholar
10. Bertin, J. J., Aerodynamics for Engineers, Fourth Edition, Prentice Hall, New Jersey, Chapter 7, pp. 239–244 (2002).Google Scholar
11. Hoerner, S. F., “Fluid-dynamic Drag,” Practical Information on Aerodynamic Drag and Hydrodynamic Resistance, Hoerner Fluid Dynamics, Brick Town, NJ Chapter 8, pp. 7.1–7.3 (1965).Google Scholar
12. Hoerner, S. F. and Borst, H. V., “Fluid-dynamic Lift,” Practical Information on Aerodynamic and Hydrodynamic Lift, Hoerner Fluid Dynamics, Brick Town, NJ (1975).Google Scholar