세장형 물체 주위 고앙각 유동의 비대칭 와류 및 측력 특성에 관한 수치적 연구

A NUMERICAL STUDY ON THE CHARACTERISTICS OF ASYMMETRIC VORTICES AND SIDE FORCES ON SLENDER BODIES AT HIGH ANGLES OF ATTACK

  • 정성기 (경상대학교 대학원 항공공학과) ;
  • 정재홍 (경상대학교 대학원 항공공학과) ;
  • 명노신 (경상대학교 기계항공공학부 및 항공기부품기술연구소) ;
  • 조태환 (경상대학교 기계항공공학부 및 항공기부품기술연구소)
  • 발행 : 2006.09.01

초록

Flow around a guided missile in high maneuver, i.e. at a high angle of attack, shows complex phenomena. It is well known that even in geometrically symmetric conditions the flow around a missile at high angles of attack can generate unexpected large side forces and yaw moments due to asymmetric vortices. In this paper, a CFD code (FLUENT) based on the Navier-Stokes equations was used for the numerical analysis to find a suitable numerical mechanism for generation of asymmetric vortices. It is shown that a numerical technique of applying different surface roughness to a specific area of the missile nose surface gives the best fit in comparison with the experimental results. In addition, a numerical investigation of variations of side forces and pressure distributions with angle of attack and roll angle was conducted for the purpose of identifying the source of vortex asymmetries.

키워드

참고문헌

  1. Dunne, A.L., Black, S., Schmidt, G.S., and Lewis, T.L., 1990, "VLA Missile Development and High Angle of Attack Behavior," NTIS N90-17553
  2. Luo, S.C. et al., 1998, "Flowfield Around Ogive/Elliptic-Tip Cylinder at High Angle of Attack," AIAA Journal, Vol.36, No.10, p.1778-1787 https://doi.org/10.2514/2.286
  3. Champigny, P., 1994, "High Angle of Attack Aerodynamics," AGARD Report 804 (Special Course on Missile Aerodynamics)
  4. FLUENT 6.1 User's Guide, 2003, FLUENT Inc
  5. Wilcox, D.C., 2002, "Turbulence Modeling for CFD," 2nd ed., DCW Industries
  6. Degani, D., 1991, "Effect of Geometrical Disturbance on Vortex Asymmetry," AIAA Journal, Vol.29, No.4, p.560-566 https://doi.org/10.2514/3.59929
  7. Lamont, P.J., 1982, "Pressure Around an Inclined Ogive Cylinder with Laminar, Transitional, or Turbulent Separation," AlAA Journal, Vol.20, No.11, p.1492-1499
  8. 황수정, 1996, "큰 받음각을 가진 세장형 물체 주위의 유동현상 예측에 관한 수치기법 연구," 박사학위 논문, 서울대 대학원
  9. Yuan, C.C. and Howard, R. M., 1991, "Effects of Forebody Strakes on Asymmetric Vortices for a Vertically-Launched Missile," AIAA Paper 91-2864-CP
  10. Lesage, F., Nicolle, J., and Boulianne, M.A., 2000, "Navier-Stokes Computations of High Angle of Attack Missile Flowfields," AlAA Paper 2000-4212
  11. Zilliac, G.G., Degani, D., and Tobak, M., 1991, "Asymmetric Vortices on a Slender Body of Revolution," AlAA Journal, Vol.29, No.5, p.667-675