Moments on a Coning Projectile by a Spinning Liquid in Porous Media

Report No. ARL-RP-108
Authors: Gene R. Cooper
Date/Pages: September 2005; 16 pages
Abstract: Moments are predicted due to an inviscid liquid payload flowing in a sequence of end to uniform cylinders stacked in columns displaced off the spin axis of a coning projectile during free flight. These moments are then compared to moments generated by flow of the same liquid that saturates porous media contained in a sequence of uniform cylinders along the projectile symmetry axis. A modification to the classical Stewartson theory and is added to describe inertial waves in porous media. This theory is used to analysis the inertial waves produced in the liquid by the projectile coning motion. The resulting side moments are examined in reference to the type of porous media used and the assumed cylinder geometry subjected to applied coning frequencies. Eigen-frequencies and their impact on liquid moments are discussed concerning the stability of the free flight projectile.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2005