REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

Numerical and Experimental Investigation of Aerodynamic Characteristics of Spin Stabilized Projectile

Damir D. JerkoviĆ

University of Defense in Belgrade, Military Academy, damir.jerkovic@va.mod.gov.rs

ALEKSANDAR V. KARI

University of Defense in Belgrade, Military Academy, aleksandar.kari@va.mod.gov.rs

neboJŠA HRISTOV

University of Defense in Belgrade, Military Academy, nebojsahristov@gmail.com

slobodan s. ilić

University of Defense in Belgrade, Military Academy, slobodan.ilic@vs.rs

slobodan savić

University in Kragujevac, Faculty of Engineering Sciences, ssavic@kg.ac.rs

Abstract: The paper presents the numerical and experimental research and the analysis of the aerodynamic coefficients of the spin stabilized projectile. The numerical prediction method of aerodynamic coefficients is performed with CFD (Computational Fluid Dynamics) steady RANS (Reynolds Averaged Navier Stokes equation) method, four different models of turbulence and three different types of mesh. The semi-empirical methods are performed to predict the values of aerodynamic coefficients and derivatives. Experimental investigation is performed through aerodynamic wind tunnel tests and ballistic proving ground tests. The analyses of static aerodynamic coefficients are performed for subsonic, transonic and supersonic flow for different numerical and experimental research. The experimental proving ground test investigations are done using 3D ballistic radar for transonic and supersonic flight Mach numbers. The comparison of the numerically predicted values of the aerodynamic characteristics is accomplished through the 6-DoF flight model of 40 mm model of projectile in relation to the experimental results. The performed numerical techniques and methods on the structured type of mesh coupled with SST k-ω turbulence model are generated wide and qualitative aerodynamic description for projectile flight dynamic modeling, according to acquired experimental flight test results on the proving ground.

Keywords: aerodynamic coefficient, RANS, SST k-ω, experimental aerodynamic measurement, ballistic radar measurement