Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Aerodynamic Interference Effect of Aircraft Wing Tip Vortex in Formation Flight

편대비행상태에서 날개 끝 와류의 공력 간섭 효과

  • Cho, Hwan-Kee (Department of Flight Operation and Aeronautical Science, CheongJu University) ;
  • Lee, Sang-Hyun (Department of Aerospace/Mechnical Engineering, ROK Air Force Academy) ;
  • Lee, Soontae (Department of Aerospace/Mechnical Engineering, ROK Air Force Academy)
  • Received : 2013.06.13
  • Accepted : 2013.10.22
  • Published : 2013.11.01
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Abstract

Experimental study was conducted to investigate aerodynamic interference effect of wing tip vortex in formation flight of high speed aircraft. In formation flight, wing tip vortex produced by leading aircraft can affect on the aerodynamic characteristics of trailing aircraft. The interference effect of flow is varied with distances between wing tips of leading and trailing aircraft. It is confirmed, in this study, that the interference of wing tip vortex generated from the leading aircraft makes the aerodynamic forces and moments of the trailing aircraft with the vertical or horizontal positions of the trailing aircraft. Especially, the lift coefficients of trailing aircraft were highly increased at y/b=-0.125, z/b=0.0 or deeply decreased at y/b=-0.5, z/b=0.38. The interfering pattern of wing tip vortices from two aircraft is precisely observed.

본 연구에서는 편대비행하는 고속 항공기의 날개 끝 와류의 공력 간섭 효과를 연구하기 위해서 풍동실험기법이 적용되었다. 편대비행에서 앞선 항공기의 날개 끝에서 발생하는 와류가 뒤따르는 항공기의 공력 특성에 영향을 미칠 수 있다. 흐름의 간섭 효과는 앞선 항공기와 뒤따르는 항공기의 날개 끝 사이의 거리에 따라서 변화된다. 본 연구의 실험결과 앞선 항공기에서 발생되는 날개 끝 와류는 뒤따르는 항공기의 공력 및 모멘트 계수를 변화시킴을 확인하였다. 특히, 후방 항공기의 양력계수는 수직 및 수평 위치에 따라 y/b=-0.125, z/b=0.0에서 가장 많이 증가되거나 y/b=-0.5, z/b=0.38에서 가장 크게 감소됨을 확인하였으며, 두 항공기로부터 발생된 날개 끝 와류의 간섭 현상이 자세히 관찰되었다.

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References

  1. Lebar Bajec, I. and Heppner, F. H., Organized flihgt in birds, Animal Behaviour, Vol. 78(4), PP. 777-789, 2009. https://doi.org/10.1016/j.anbehav.2009.07.007
  2. Hansen, J .L and Cobleigh, B. R., "Induced Moment Effects of Formation Flight Using Two F/A-18 Aircraft", Flight Mechanics Conference and Exhibit, AIAA 2002-4489, 2002..
  3. Hyatt, J. H. and Blake, W. B., "Aerodynamic Database Issues for Modeling Close Formation Flight", AIAA 99-4194, 1999.
  4. Bangash, Z. A., Sanchez, R. P. and Ahmed, A., "Aerodynamics of Formation Flight", J. of Aircraft, Vol. 43, No. 4, pp. 907-912, 2006. https://doi.org/10.2514/1.13872
  5. Blake, W. B. and Gingras, D. R., "Comparison of Predicted and Measured Formation Flight Interference Effects", Journal of Aircraft, Vol. 41, No. 2, pp. 201-207, 2004 https://doi.org/10.2514/1.9278
  6. Porter, D. B. and Howardf, R. M., ",Aerodynamic Interference of Dissimilar Aircraft Flying in Close Proximity", Journal of Aircraft Vol. 33, No. 2, Engineering Notes, pp. 440-441, 1995.