Fig. 1. Typical grid fin of the missile and rocket system (Weimorts, 2001; Space X, 2015)
Fig. 2. Flow characteristics of a grid fin
Fig. 3. Design of the grid-fin adapted sub-munition model (Base model)
Fig. 4. Mesh configuration of the domain
Fig. 5. Grid-fin adapted sub-munition model for the wind test
Fig. 6. Comparison between numerical simulation and wind test result of drag coefficient(Cd)
Fig. 7. Wind test results (pitching moment coefficient)
Fig 8. Comparison of pitching moment coefficient between numerical simulation and wind test (M=0.9)
Fig. 9. Mach contour of the base grid-fin adapted model
Fig. 10. Candidates of grid fins (3 types)
Fig. 11. Drag coefficient(Cd) under various web-thickness condition
Fig. 12. Pitching moment coefficient(Cm) of the grid fin adapted models
Fig. 13. Mach contour of the 3 types grid-fin adapted model (M=0.7, α=15°)
Fig. 14. Pressure coefficient contour of the 3 types grid-fin adapted model (M=0.7, α=15°)
Table 1. Required conditions for the performance validation
Table 2. Critical mach number of the grid-fin adapted model
References
- DeSpirito, J., H.L. Edge, W. Paul, S. Jubaraj and P.G.D. Surya (2000) "CFD Analysis of Grid Fins for Maneuvering Missiles", 39st Aerospace Sciences Meeting and Exhibit, Reno, AIAA 2000-0391.
- Dikbas, E. (2015) Design of a Grid Fin Aerodynamic Device for Transonic Flight Regime, M.S. Thesis, Middle East Technical University.
- Fleeman, E. (2001) Tactical Missile Design, American Institute of Aeronautics and Astronautics, Inc.
- ANSYS Inc. (2018) Fluent 19.0 User's Guide
- Fournier, E.Y. (2001) "Wind Tunnel Investigation of Grid Fin and Conventional Planar Control Surfaces", 39st Aerospace Sciences Meeting and Exhibit, Reno, AIAA 2001-0256.
- Hughson, M.C. and L.B. Eric (2006) "Transonic Aerodynamic Analysis of Lattice Grid Tail Fin Missiles", 24th Applied Aerodynamics Conference, San Francisco, AIAA 2006-3651.
- Li, Y., J. Shan, J. Su and Y. Huang (2013) "Numerical simulation on circular-arc grid fin configurations", Applied Mechanics and Materials, 444-445, 342-346. https://doi.org/10.4028/www.scientific.net/AMM.444-445.342
- Miller, M.S. and W.D. Washington (1994) "An experimental Investigation of Grid Fin Drag Reduction Techniques", 12th Applied Aerodynamics Conference, Colorado, AIAA 94-1914-CP.
- Orthner, K.S. (2004) Aerodynamic Analysis of Lattice Grid Fins in Transonic Flow, M.S. Thesis, Air Force Institute of Technology.
- Space X (2015) "Grid Fins" available at http://www.spacex.com/news/2015/08/31/grid-fins
- Spalart, P.R. and S.R. Allmaras (1992) "A One-equation Turbulence Model for Aerodynamic Flows", 30st Aerospace Sciences Meeting and Exhibit, Reno, AIAA 92-0439.
- Theerthamalai, P. and M. Nagarathinam (1993) "Aerodynamic analysis of grid-fin configurations at supersonic speed", Journal of Spacecraft and Rockets, 43(4), 750-756. https://doi.org/10.2514/1.16741
- Washington, W.D. (1993) "Grid-fins-A new concept for missile stability and control", 31st Aerospace Sciences Meeting and Exhibit, Reno, AIAA 93-0035.
- Washington, W.D. and M.S. Miller (1993) "Curvature and Leading Edge Sweep Back Effects on Grid Fin Aerodynamics Characteristics", Applied Aerodynamics Conference, Monterey, AIAA 93-3480.
- Weimorts (2011) "A MOAB in John Deere Green", available at https://travelforaircraft.wordpress.com/2011/07/22/a-moab-in-john-deere-green/ (Accessed Jan 9. 2018)
- Zeng, Y., J. Cai, M. Debiasi and T.L. Chng (2009) "Numerical study on drag reduction for grid-fin configurations", 47th Aerospace Sciences Meeting Including The New Horizon Forum and Aerospace Exposition, Orlado, AIAA 2009-1105.