The supersonic aerodynamics of a high spin armor-piercing fin-stabilized discarding sabot projectile (APFSDS) is numerically and experimentally investigated. Classically, using a 120 mm smooth bore gun, the value of the nondimensional steady spin rate of the inflight APFSDS projectile is about 0.01. In our case, a medium caliber APFSDS projectile is fired using a rifled barrel gun. The initial nondimensional spin rate, which is, with the Mach and the Reynolds numbers, the third similitude parameter governing the projectile aerodynamics, is significantly greater and about 0.09. Complex aerodynamics and flight dynamics were found and are detailed in the paper. In particular, the side force and moment evolutions with spin rate and angle of attack reflect a highly nonlinear behavior of the Magnus effect. The numerical predictions are mainly based on Reynolds-averaged Navier–Stokes (RANS) and URANS (Unsteady RANS) equations. Flight tests have been performed in an aeroballistics corridor. The exterior ballistics of the projectile was investigated using a yaw cards method, the experimental results are analyzed using a 6DOF flight dynamics model. The comparison between computational fluid dynamics (CFD) computations and flight tests results is satisfactory. CFD computations show, for the first time at our knowledge, that a roll-pitch coupling may appear.
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Complex Aerodynamics Behavior of High Spin APFSDS Projectile
Roxan Cayzac,
ENSIB/PRISME,
e-mail: r.cayzac@nexter-group.fr
Roxan Cayzac
1
Head of Aerodynamics Technical Direction Nexter Munitions
,7 Route de Guerry
,18023 Bourges Cedex
, France
;Associate Professor of the Universities
,ENSIB/PRISME,
88 Boulevard Lahitolle, 18020 Bourges Cedex
, France
e-mail: r.cayzac@nexter-group.fr
1Corresponding author.
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Settie Heddadj
Settie Heddadj
Head of Flight Dynamics
Technical Direction
e-mail: s.heddadj@nexter-group.fr
Technical Direction
e-mail: s.heddadj@nexter-group.fr
Nexter Munitions
,7 Route de Guerry
,18023 Bourges Cedex
, France
Search for other works by this author on:
Roxan Cayzac
Head of Aerodynamics Technical Direction Nexter Munitions
,7 Route de Guerry
,18023 Bourges Cedex
, France
;Associate Professor of the Universities
,ENSIB/PRISME,
88 Boulevard Lahitolle, 18020 Bourges Cedex
, France
e-mail: r.cayzac@nexter-group.fr
Eric Carette
Settie Heddadj
Head of Flight Dynamics
Technical Direction
e-mail: s.heddadj@nexter-group.fr
Technical Direction
e-mail: s.heddadj@nexter-group.fr
Nexter Munitions
,7 Route de Guerry
,18023 Bourges Cedex
, France
1Corresponding author.
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received June 28, 2012; final manuscript received September 12, 2012; accepted manuscript posted January 9, 2013; published online April 19, 2013. Assoc. Editor: Bo S. G. Janzon.
J. Appl. Mech. May 2013, 80(3): 031601 (7 pages)
Published Online: April 19, 2013
Article history
Received:
June 28, 2012
Revision Received:
September 12, 2012
Accepted:
January 9, 2013
Citation
Cayzac, R., Carette, E., and Heddadj, S. (April 19, 2013). "Complex Aerodynamics Behavior of High Spin APFSDS Projectile." ASME. J. Appl. Mech. May 2013; 80(3): 031601. https://doi.org/10.1115/1.4023337
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