Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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SELECTION OF THE OPTIMAL POSITION OF THE FLAP FOR THE IMPROVEMENT OF AERODYNAMIC PERFORMANCE

공기역학적 성능 향상을 위한 플랩의 최적 위치 선정

  • Kang, H.M. (Aerodynamics Team, Korea Aerospace Research Institute) ;
  • Park, Y.M. (Civil Aircraft Systems Design Team, Korea Aerospace Research Institute) ;
  • Kim, C.W. (Aerodynamics Team, Korea Aerospace Research Institute) ;
  • Lee, C.H. (Aerodynamics Team, Korea Aerospace Research Institute)
  • 강형민 (한국항공우주연구원, 공력성능팀) ;
  • 박영민 (한국항공우주연구원, 중형기체계설계팀) ;
  • 김철완 (한국항공우주연구원, 공력성능팀) ;
  • 이창호 (한국항공우주연구원, 공력성능팀)
  • Received : 2013.09.11
  • Accepted : 2013.12.24
  • Published : 2013.12.31
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Abstract

The selection of the optimal position of the flap was performed in order to improve the aerodynamic performance during the take-off and landing processes of aircraft. For this, the existing airfoils of the main wing and flap are selected as the baseline model and the lift coefficients (cl) according to angle of attacks (AOA) were calculated with the change of the position of flap airfoil. The objective function was defined as the consideration of the maximum cl, lift to drag ratio and cl at certain AOA. Then, at 121 experimental points within $20mm{\times}20mm$ domain, two dimensional flow simulations with Spalart-Allmaras turbulence model were performed concerning the AOA from 0 to 15 degree. If the optimal position was located at the domain boundary, the domain moved to the optimal position. These processes were iterated until the position was included in the inside of the domain. From these processes, the flow separation at low AOA was removed and cl increased linearly comparing with that of the baseline model.

Keywords

References

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