Accession Number : ADA185270

Title :   Computational Aerodynamic Analysis for a Range-Limited 25mm Training Round.

Descriptive Note : Technical rept.,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Guidos, Bernard J ; Sturek, Walter B

PDF Url : ADA185270

Report Date : Aug 1987

Pagination or Media Count : 61

Abstract : A computational aerodynamics study is presented for an initial design configuration intended for use as a training round for a 25mm gun. The shell is designed with a non-axisymmetric boattail which induces a large de-spin moment. The purpose for such a design is to limit the range of the round through aerodynamic destabilization. The paper reports a computational aerodynamics study using a thin-layer Parabolized Navier Stokes computational technique. Static aerodynamic coefficients and roll damping are computed for a range of supersonic Mach numbers and boattail lengths. Comparisons are made with computational predictions for axisymmetric configurations and firing range data. A six degree-of-freedom trajectory simulation code is used to estimate the early flight characteristics for the configurations of interest.

Descriptors :   *AERODYNAMIC FORCES, *FIN STABILIZED AMMUNITION, *SPIN STABILIZED AMMUNITION, SUPERSONIC CHARACTERISTICS, BOATTAIL AFTERBODIES, NAVIER STOKES EQUATIONS, CONICAL BODIES, COMPUTATIONS, THREE DIMENSIONAL FLOW, AERODYNAMIC CONFIGURATIONS, PARABOLAS, ANGLE OF ATTACK, SPINNING(MOTION), PROJECTILES, PITCH(MOTION), ROLL, TRAINING AMMUNITION, AERODYNAMICS

Subject Categories : Ammunition and Explosives
      Armor
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE