Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Aerodynamics of a 2-D Flat-plate Airfoil with Tripwire

2차원 평판날개에서의 Tripwire가 공력에 미치는 영향

  • Je, Du-Ho (Dep. Weapons and Mechanical Engineering, Korea Military Academy) ;
  • Lee, Jongwoo (Dep. Weapons and Mechanical Engineering, Korea Military Academy)
  • 제두호 (육군사관학교 무기기계공학과) ;
  • 이종우 (육군사관학교 무기기계공학과)
  • Received : 2013.04.15
  • Accepted : 2013.07.26
  • Published : 2013.08.05
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Abstract

In this paper, we experimentally investigated the effects of attached cylindrical tripwires on the aerodynamic performance. The research was carried out with a simple two-dimensional (2-D) rectangular airfoil fabricated from thin flat-plate aluminium, with elliptical leading and trailing edges. Tripwires of varying widths and thicknesses, and attack angles of $-5^{\circ}{\sim}20^{\circ}$ were used to investigate the aerodynamic characteristics (e.g. lift and drag forces) of the airfoil. We found that attaching the tripwires to the lower surface of the airfoil enhanced the lift force and increased the lift-to-drag ratio for low attack angles. However, attaching the tripwires to the upper surface tended to have the opposite effects. Moreover, we found that attaching the tripwires to the trailing edge had similar effects as a Gurney flap. The aerodynamic characteristics of the flat-plate airfoil with tripwires can be used to develop passive control devices for aircraft wings in order to increase their aerodynamic performance when gliding at low attack angles.

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References

  1. Pelletier, A. and Mueller, T. J., Low Reynolds Number Aerodynamics of Low-aspect-ratio, Thin/Flat/Cambered-plate Wings, J. Aircraft, Vol. 37, No. 5, 825-832, 2000. https://doi.org/10.2514/2.2676
  2. Selig, M. S. and Donovan, J. F., and Fraser, D. B., Airfoils at Low Speeds, Stokely, Virginia Beach, VA, 1989.
  3. Null, W., and Shkarayev, S., Effect of Camber on the Aerodynamics of Adaptive-wing Micro Air Vehicles, J. Aircraft, Vol. 42, No. 6, 1537-1542, 2005. https://doi.org/10.2514/1.12401
  4. Barlow, J. B., Rae, W. H. JR. and Pope, A., Lowspeed Wind Tunnel Testing, 3rd ed. 288, 353-358, NewYork : Wiley, 1999.
  5. Mueller, T. J. and Burns, T. F., Experimental Studies of the Eppler 61 Airfoil at Low Reynolds Numbers, AIAA paper. 82-0345, 1982.
  6. Selig, M. S. and McGranahan, B. D., Wind Tunnel Aerodynamic Tests of Six Airfoils for Use on Small Wind Turbines, Report. NREL/SR-500-34515, 2003.
  7. Mueller, T. J. and DeLaurier, J. D., Aerodynamic of Small Vehicles, Annu. Rev. 35, 89-111, 2003.
  8. McCullough, G. B. and Gault, D. E., Examples of Three Representative Types of Airfoil-section Stall at Low Speed, NACA TN-2502, 1951.
  9. Storms, B. L. and Jang, C. S., Lift Enhancement of an Airfoil using a Gurney Flap and Vortex Generators, J. Aircraft, Vol. 31, 542-547, 1994. https://doi.org/10.2514/3.46528
  10. Troolin, D. R., Longmire, E. K. and Lai, W. T., Time Resolved PIV Analysis of Flow Over a NACA0015 Airfoil with Gurney Flap, Exp. Fluids, 41, 241-254, 2006. https://doi.org/10.1007/s00348-006-0143-8
  11. Liu, T. C. and Montefort, J., Thin-airfoil Theoretical Interpretation for Gurney Flap Lift Enhancement, J. Aircraft, Vol. 44, 667-671, 2007. https://doi.org/10.2514/1.27680
  12. Wang, J. J., Li, Y. C. and Choi, K. S., Gurney Flap - Lift Enhancement, Mechanisms and Application, Aeronaut J. Vol. 44, 22-47, 2008.
  13. Li, Y. C., Wang, J. J., Tan, G. K. and Zhang, P. F., Effects of Gurney Flaps on the Lift Enhancement of a Cropped Nonslender Delta Wing, Exp. Fluids, 32, 99-105, 2009.