Accession Number : AD1037832

Title :   Experimental Flight Characterization of Spin Stabilized Projectiles at High Angle of Attack

Descriptive Note : Technical Report,01 Jun 2016,30 Jun 2017

Corporate Author : Army Research Laboratory Aberdeen Proving Ground United States

Personal Author(s) : Fresconi,Frank ; Celmins,Ilmars

Full Text :

Report Date : 07 Aug 2017

Pagination or Media Count : 36

Abstract : The goal of this study was to better understand the flight of spin-stabilized projectiles at high angle of attack for improved delivery accuracy of indirect fires. Experiments successfully captured flight motions over 40 angle of attack around Mach 0.8 using advanced spark range techniques. Flight analysis validated analytical expressions, kinematics, and dynamics with mass asymmetries, aerodynamic modeling, and parameter estimation algorithms. Significant nonlinearities in angle of attack were quantified in the axial force and Magnus moment with more-linear behavior found in the normal force and pitching moment. Stability analysis indicated that this vehicle does not fly below 3 angle of attack and likely suffers instabilities around 3 angle of attack. These results ultimately improve impact point prediction for applications such as high-arcing, spin-stabilized munitions.

Descriptors :   aerodynamic characteristics , high angles , measurement , aerodynamic forces , projectiles , accuracy , wind tunnels , angular motion , computational fluid dynamics , algorithms , flight paths , differential equations , aerodynamics

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE