Abstract

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.

주제어

#고앙각 공기역학   #비대칭 와류   #측력 계수   #표면 거칠기   #대류 불안정성  

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참고문헌 (11)

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 
3. Wilcox, D.C., 2002, "Turbulence Modeling for CFD," 2nd ed., DCW Industries 
4. 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 
5. Champigny, P., 1994, "High Angle of Attack Aerodynamics," AGARD Report 804 (Special Course on Missile Aerodynamics) 
6. 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 
7. FLUENT 6.1 User's Guide, 2003, FLUENT Inc 
8. Lesage, F., Nicolle, J., and Boulianne, M.A., 2000, "Navier-Stokes Computations of High Angle of Attack Missile Flowfields," AlAA Paper 2000-4212 
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. Degani, D., 1991, "Effect of Geometrical Disturbance on Vortex Asymmetry," AIAA Journal, Vol.29, No.4, p.560-566 
11. 황수정, 1996, "큰 받음각을 가진 세장형 물체 주위의 유동현상 예측에 관한 수치기법 연구," 박사학위 논문, 서울대 대학원 

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