Projected area and drag coefficient of high velocity irregular fragments that rotate or tumble

Author
Moxnes, John Fredrik
Frøyland, Øyvind
Øye, Ivar Jarle
Brate, Tom I.
Friis, Eva
Ødegårdstuen, Gard
Risdal, Tallak Harald
Date Issued
2017
Keywords
Prosjektiler
Fragmenter
Permalink
http://hdl.handle.net/20.500.12242/823
https://publications.ffi.no/123456789/823
DOI
10.1016/j.dt.2017.03.008
Collection
Articles
Description
Moxnes, John Fredrik; Frøyland, Øyvind; Øye, Ivar Jarle; Brate, Tom I.; Friis, Eva; Ødegårdstuen, Gard; Risdal, Tallak Harald. Projected area and drag coefficient of high velocity irregular fragments that rotate or tumble. Defence Technology 2017
1527162.pdf
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Abstract
3 degrees of freedom (DOF) exterior ballistic computer models are used in fragment studies to calculate individual trajectories of each fragment based on drag coefficient and the projected (presented) area in the direction of velocity of center of mass. The expectation of a randomly distributed projected area is commonly used for fragments that tumble (random rotation) during flight. We forecast a model where the expected drag coefficient is dependent of shape and Mach number. Rotation or tumbling only affects the expected projected area. Models of projected areas during tumbling and rotation are presented. An examination of the data by McCleskey (1988) indicates that the volume of the fragment to the power of 2/3 is a better parameter to characterize the drag coefficient of the fragments than the maximum projected area. Hydrocode simulations are used to verify results and to study projected area and drag coefficient of fragments.
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