DOI QR코드

DOI QR Code

전산해석을 활용한 두께비 18%익형(Case1)의 공력특성 분석

Aerodynamic Analysis of 18% Thick Airfoil(Case 1) with Computational Fluid Dynamics

  • Kim, Cheolwan (Aeronautics Technology Research Office Korea Aerospace Research Institute) ;
  • Lee, Yung-gyo (Aeronautics Technology Research Office Korea Aerospace Research Institute)
  • 투고 : 2016.11.15
  • 심사 : 2017.02.27
  • 발행 : 2017.03.01

초록

두께비 18% 익형(KARI-11-180)에 대한 공력특성 분석이 전산해석기법을 활용해 수행되었다. 익형주위의 격자는 벽면에서 수직으로 투영하여 경계층 격자를 형성하였고 익형 후방에는 정밀한 후류 예측을 위해 조밀한 격자를 위치하였다. 원방경계까지의 거리는 익형 코드의 100배로 정하였고 익형시험결과와의 비교를 위해 자유류 속도, 익형 코드 및 Reynolds수를 풍동시험과 동일하게 정하였다. 또한 난류 모델은 천이지점 예측이 우수한 transition SST 및 DES 모델을 사용하였다. 3차원 전산해석은 세장비가 2와 5인 익형모델에 대해 수행되었는데 양력은 풍동시험결과보다 높은 값을 항력은 낮은 값을 예측하였다.

Aerodynamic analysis for the airfoil, KARI-11-180 having 18% thickness ratio, was performed with CFD techniques. The boundary layer grid was generated by projecting the wall grid normally and fine grid was placed behind the trailing edge to capture the wake accurately. The distance to the far boundary is 100 chords and the flow condition is same as the wind tunnel test condition. Transition SST and DES turbulence models were utilized for accurate prediction of the transiton point. The predicted lift is higher but the drag is predicted lower than the wind tunnel test. 3-dimensional results with airfoil models of which aspect ratio were 2 and 5 were compared with 2-dimensional results.

키워드

참고문헌

  1. M. Drela, XFOIL:An Analysis and Design System for Low Reynolds Number Airfoil, Low Reynolds Number Aerodynamics, Springer-Ver lag Lecture Notes in Engineering, Vol. 54, 1989
  2. Kim, C. W. and Cho, T. H., "Wind Tunnel Test of the 2D Airfoil for the MW Size Wind Turbine", Journal of Wind Energy, Vol.2, No. 2, 2011
  3. Langtry, R. B., and Menter, F. R., "Correlation-Based Transition Modeling for Unstructured Parallelized Computational Fluid Dynamics Codes," AIAA Journal, Vol. 47, No. 12, 2009, pp. 2894-2906. https://doi.org/10.2514/1.42362
  4. Travin, A., Shur, M., Strelets, M., and Spalart, P. R., "Physical and Numerical Upgrades in the Detached-eddy Simulation of Complex Tubulent Flows,"Advances in LES of Complex Flows, Vol. 65, 2004, pp. 239-254.