The development of high accuracy rifle has uncovered a need forunderstanding the movement of the bullet in muzzle flow. Recent researcheshave always been focused on computational fluid dynamics (CFD) andexperimental research on the muzzle flow, which released many data, suchas velocity and base pressure drop of projectile. Due to CFD tests are timeconsuming,a dynamic model for spatial motion of projectile is established.In this model an empirical relationship is utilized for the base pressure ofprojectile, and the model is assumed that the base pressure is along the axisof barrel which applied on the tail cone of the bullet; The spatial motionequations deduced from the mass center motion equations and Eulerequations of motion are solved with Runge-Kutta method. A 7.62 caliberbullet is tested to verify the dynamic model. The result agrees with the CFDand experimental data, which shows that the model is applicable inpredicting the translational motions, besides the angular motion of projectileis also presented, which can be the initial condition of exterior ballistics toanalyses the firing accuracy.
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