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

  • 제30권4호
  • /
  • Pages.44-52
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  • 2002
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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저 레이놀즈수 유동에서 Flapping-Airfoil의 수치적 공력특성 연구

Numerical Study on Aerodynamic Characteristics of Flapping-Airfoil in Low Reynolds Number Flows

  • 이정상 (서울대학교 기계항공공학부 대학원) ;
  • 김종암 (서울대학교 기계항공공학부) ;
  • 노오현 (서울대학교 기계항공공학부)
  • 발행 : 2002.06.01
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초록

비정상, 비압축성 Navier-Stokes 코드를 이용하여, 저 레이놀즈수 유동에서 flapping 운동을 하는 익형의 공력특성을 수치해석적인 방법으로 연구하였다. 비정상 유동장의 효율적인 계산을 위하여, 개발된 코드는 MPI 프로그래밍 기법을 이용하여 병렬처리 되었으며, 난류 유동장의 계산을 위해 2방정식 난류모델의 하나인 k-$\omega$ SST 모델을 적용하였다. 익형의 3가지 운동모드 즉, pitching, plunging, flapping과 주파수 및 진폭의 변화 그리고 두께와 캠버의 변화에 의한 공력특성을 살펴보았고, 이를 위해 NACA4자 계열의 익형을 이용하였다. 해석 결과는 실험치와 비교하여 보았을 때 잘 일치하였으며, 각 운동모드에서의 공기역학적 특성을 파악할 수 있었다.

Aerodynamic characteristics of a flapping airfoil in low Reynolds number flows are numerically studied using the unsteady, incompressible Navier-Stokes flow solver with a two-equation turbulence model. For more efficient computation of unsteady flows over flapping airfoil, the flow solver is parallel-implemented by MPI programming method Unsteady computations are performed for low Reynolds number flows over a NACA four-digit series airfoils. Effects of pitching, plunging, and flapping motion with different reduced frequency, amplitude, thickness and camber on aerodynamic characteristics are investigated. Present computational results yield a better agreement in thrust at various reduced frequency with experimental data.

키워드

참고문헌

  1. Jones, K. D., and Platzer, M. F.,"Numerical Computation of Flapping-WingPropulsion and Power Extraction," AIAA Paper97-0826, Reno, NV, Jan. 1997
  2. Tuncer, I. H., and Platzer, M. F., "Computational Study of Flapping Airfoil Aerodynamics," Journal of Aircraft, Vol. 37, No. 3, May. 2000, pp.514-520 https://doi.org/10.2514/2.2628
  3. Rogers, S. E., and Kwak, D., "Upwind Differencing Scheme for the Time-Accurate Incompressible Navier-Stokes Equations," AIAA Journal, Vol. 28, No. 2, Feb. 1990, pp.253-262 https://doi.org/10.2514/3.10382
  4. Menter, F. R., "Two-Equation Eddy-Viscosityturbulence Models for Engineering Application,"AIAA Journal, Vol. 32, No.8, Aug. 1994, pp.1598-1605 https://doi.org/10.2514/3.12149
  5. Kim, C. S., Kim, C., and Rho, O. H.,"Parallel Computation of High-Lift Airfoil FlowUsing Two-Equation Turbulence Model," AIAAJournal, Vol. 38, No.8, Aug. 2000, pp.1360-1368 https://doi.org/10.2514/2.1135
  6. Yoon, S. and Kwak, D., "Three-DimensionalIncompressible Navier-Stokes Solver UsingLower-Upper Symmetric- Gauss-Seidel Algorithm,"AIAA Journal, Vol. 29, No.6, 1991, pp.874, 875. https://doi.org/10.2514/3.10671
  7. Koochesfahani , M. M., "Vortical Patternsin the Wake of an Oscillating Airfoil," AIAAJournal, Vol. 27, No. 9, Sep. 1989, pp.1200-1205 https://doi.org/10.2514/3.10246
  8. Ramamurti, R., and Sandberg, W., "Simulationof Flow About Flapping Airfoil Using FiniteElement Incompressible Flow Solver," AIAAJournal, Vol. 39, No. 2, Feb. 2001, pp.253-260 https://doi.org/10.2514/2.1320
  9. Isogai, K., and Shinmoto, Y., "Effect ofDynamic Stall on Propulsive Efficiency andThrust of Flapping Airfoil," AIAA Journal, Vol.39, No. 10, Oct. 1999, pp.1145-1151 https://doi.org/10.2514/2.589
  10. Jones, K. D., and Platzer, M. F., "AnExperimental and Numerical Investigation ofFlapping-Wing Propulsion," AIAA Paper99-0995, Monterey, NV, Jan. 1999.
  11. Jones, K. D., and Platzer, M. F.,"Flapping-Wing Propulsion for a Micro AirVehicle," AIAA Paper 2000-0897, Reno, NV, Jan.2000
  12. Ellington, C P., "The Novel Aerodynamicsof Insect Flight:Application to Micro-AirVehicles," The Journal of Experimental Biology,202, 1999, pp.3439-3448
  13. Okamoto, M., Yasuda, K., and Azuma,A., "Aerodynamic Characteristics of the Wingand Body of a Dragonfly," The Journal ofExperimental Biology, 199, 1996, pp.281-294
  14. Shyy, W., Berg. M., and Ljungqvist, D.,"Flapping and Flecible wing for biological andMicro Air Vehicles" Progress in AerospaceSciences, 1999. pp.455-505 https://doi.org/10.1016/S0376-0421(98)00016-5
  15. 김창성, 김종암, 노오현, "Chimera 격자기법의 병렬처리를 이용한 고양력 익형 주위 난류 유동장의 효율적 해석,” 한국항공우주학회지, 제27권 제4호, 1999.
  16. Willcox, D. C., “Turbulence Modeling forCFD," Dew Industries, Inc., 1993, pp.73-170
  17. Ok, H., "Development of IncompressibleNavier-Stokes Solver and Its Application to theCalculation of Separated Flows," Ph. D.Dissertation, Dep't of Aeronautics andAstronautics Eng., Univ. of Washington, 1993.
  18. Yukiya, A., and Jun, N., "RS/6000SP:PracticalMPI Programming," IBM, InternationalTechnical Support Organization, Aug. 1999.