Numerical Computations of Supersonic Flow Over Elliptical Projectiles

Report No. ARL-TR-2589
Authors: Jubaraj Sahu, Karen R. Heavey, Harris L. Edge
Date/Pages: December 2001; 47 pages
Abstract: Computational fluid dynamics (CFD) approaches were used to compute the supersonic and hypersonic flow fields and aerodynamic forces and moments on elliptical projectiles. Steady state numerical results have been obtained at several supersonic Mach numbers between 2.5 and 4.0 and several angles of attack from 0 to 12 degrees for the 'jet-off' conditions with the use of Euler and Navier-Stokes flow solvers. In addition, numerical computations have been performed for the 'jet-on' conditions to study the interaction of a helium jet with a free stream Mach 4.0 flow. In general, very good agreement of the computed aerodynamic coefficients with the experimental data was achieved at all speeds and angles of attack investigated for jet-off conditions. A small discrepancy exists in the comparisons for the axial force. CFD results for the jet-on case show the qualitative features and strong flow interaction between the jet and the free stream flow. The results show the predictive capabilities of CFD techniques for supersonic flow over elliptical projectiles.
Distribution: Approved for public release
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Last Update / Reviewed: December 1, 2001