Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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THE ANALYSIS OF AERODYNAMIC CHARACTERISTICS FOR BUSEMANN BIPLANE WITH FLAP

초음속 조건의 플랩을 장착한 Busemann Biplane의 플랩 길이와 각도 변화에 따른 양항비 성능 비교

  • Tai, Myungsik (Dept. of Aerospace Engineering, Pusan Nat'l Univ.) ;
  • Son, Chankyu (Dept. of Aerospace Engineering, Pusan Nat'l Univ.) ;
  • Oh, Sejong (Dept. of Aerospace Engineering, Pusan Nat'l Univ.)
  • 태명식 (부산대학교 항공우주공학과) ;
  • 손찬규 (부산대학교 항공우주공학과) ;
  • 오세종 (부산대학교 항공우주공학과)
  • Received : 2013.07.04
  • Accepted : 2013.09.16
  • Published : 2013.09.30
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Abstract

The supersonic airplane with flapped biplane, Busemann biplane equipped flap, is superior to drag and noise reduction due to wave cancelation effect between upper and lower airfoils. In this study, it is numerically calculated and analyzed the lift, drag and lift to drag ratio of flapped biplane with respect to various the length and angle of the flap. Euler solver of EDISON CFD, web based computational fluid dynamic solver for the purpose of education, is employed. Depending on the length of the flap, lift and drag increase linearly, and there exists the optimum flap angle which maximize the lift-to-drag ratio at the freestream mach 2.0 on-design condition. The predictable relational expression is driven as liner equation. As a results of comparison with drag of flapped biplane, Busemann biplane, and diamond airfoil with the same lift, the drag of flapped biplane is 88.76% lower than that of the Busemann biplane and 70.67% lower than that of the diamond airfoil. In addition, the change of pressure is compared to confirm the noise reduction effect of flapped biplane at h/c=5 of lower airfoil. The shock strength of flapped biplane is smaller than that of other airfoils.

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References

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