Journal of the Korean Society for Aviation and Aeronautics (한국항공운항학회지)

The Korean Society for Aviation and Aeronautics (한국항공운항학회)
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A Numerical Study on Unsteady Flowfield around a NACA 0021 Airfoil at High Angles of Attack

고영각 NACA 0021 익형 주위의 비정상 유동장에 대한 수치해석적 연구

  • 김상덕 (초당대학교 항공정비학과)
  • Received : 2020.03.31
  • Accepted : 2020.05.29
  • Published : 2020.06.30
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Abstract

Even though the benefit of flight at high angle-of-attack is to be able to reduce the speed of flight and maneuvers in complex flight environment, the flight at high angle-of-attack, however, is easy to be in stall which is characterized by sever unsteady flow separation over an airfoil. Current unsteady numerical analysis using DES was conducted to predict the aerodynamic characteristics of a NACA 0021 airfoil at high angle-of-attack conditions. And this provides the comparison with the steady numerical one with the typical turbulence models. The unsteady calculation by DES is appropriate in terms of predicting the aerodynamic performance of NACA 0021 airfoil at high angle-of-attack conditions.

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References

  1. Abbott, I. H., and Doenhoff, A. E., "Theory of Wing Sections", 1959, Dover Publications, Inc. NewYork.
  2. Wolfe, W. P., and Ochs, S. S., "Predicting Aerodynamic Characteristics of Typical Wind Turbine Airfoils using CFD", 1992, SANDIA REPORT, Sandia National Laboratories
  3. Kim, S. D., "A numerical study on the flowfield of a cyclone separator for oil droplets", The Korean Society for Aviation and Aeronautics, 23(4), 2015, pp. 38-43.
  4. Kim, S. D., "A numerical study on the flowfield around a NACA 0021 airfoil at angles of attack", The Korean Society for Aviation and Aeronautics, 24(4), 2016, pp. 20-25. https://doi.org/10.12985/ksaa.2016.24.4.020
  5. Spalart, P., and Allmaras, S., "A one-equation turbulence model for aerodynamic flows", Technical Report AIAA-92-0439, American Institute of Aeronautics and Astronautics 1992.
  6. Menter, F. R., "Two-equation eddy- viscosity turbulence models for engineering applications", AIAA Journal, 32(8), 1994, pp. 1598-1605. https://doi.org/10.2514/3.12149
  7. Menter, F. R., Kuntz, M., and Langtry. R., "Ten Years of Experience with the SST Turbulence Model", Turbulence, Heat and Mass Transfer, Begell House Inc. 2003, pp. 625-632.
  8. Spalart, P. R., Jou, W., Strelets, M., and Allmaras, S. R., "Comments on the feasibility of LES for wings and on a hybrid RANS/LES approach", 1997, In Advances in DNS/LES, ed. Columbus, OH: Greyden Press, pp. 137-147.
  9. Sheidahl, R. E., and Klimas, P. C., "Aerodynamic Characteristics of Seven Symmetric Airfoil Sections Through 180-Degree Angle of Attack", SANDBO-2114, Sandia National Laboratories, 1981, pp. 60-62.