Article details

Title: Airflow Parameters and Drag Coefficient Modeling Applied to 30 mm Caliber Ammunitions in Supersonic Flow
Author(s): George Surdu   Florentin Moraru   Georgică Slămnoiu   Pamfil Åžomoiag   Alin-Constantin Sava   

Abstract: Developing the launching armament systems and types of ammunitions has led to the necessity to optimize projectile’s shapes using numerical models for drag forces and drag coefficients estimation. Several studies were developed to explain the evolution of aerodynamic coefficients for drag forces of different types of flows and incidence angles flows around projectiles. All these drag forces coefficients are used to establish projectile’s evolution on trajectory. This study presents a modeling method for supersonic airflow around a 30 mm projectile configuration and drag coefficient evaluation, using MacCormack explicit method.

Keywords: aerodynamics, finite differences, drag coefficient, external ballistics.


[1] M.M. NIŢĂ, F.V. MORARU, R.N. PATRAULEA – Aircraft and Missiles: Design Concepts, Military Publishing House, Bucharest, Romania, 1985 (in Romanian)
[2] S.I. SILTON – Navier-Stokes Computations for a Spinning Projectile from Subsonic to Supersonic Speeds, Journal of Spacecraft and Rockets, Vol. 42, No. 2, pp. 223-231, 2005
[3] Gh. MARINESCU, I. RIZZOLI, I. POPESCU, C. ŞTEFAN – Computer-Aided Solution of Numerical Analysis Problems, Romanian Academy Publishing House, Bucharest, Romania, 1987 (in Romanian)
[4] C.E. MOLDOVEANU, A. GIOVANNINI, H.C. BOISSON – Turbulence Receptivity of Longitudinal Vortex-Dominated Flows, In A.F. Hegarty et al. (Eds.), “BAIL 2008 – Boundary and Interior Layers”, pp. 227-236, Springer-Verlag, Berlin, Germany, 2009
[5] J.D. ANDERSON, Jr. – Computational Fluid Dynamics: The Basics with Applications, McGraw-Hill, New York, NY, 1995
[6] A. LUNGU – Numerical Simulation in Hydrodynamics: Digitization Grids, Technical Publishing House, Bucharest, Romania, 2000 (in Romanian)
[7] T.J. CHUNG – Computational Fluid Dynamics, 2nd Edition, Cambridge University Press, New York, NY, 2010