Empirical Relationship For Muzzle Exit Pressure
In A 155 Mm Gun Tube
Author(s)
D. Carlucci & J. Vega
Abstract
The development of guided artillery projectiles has uncovered a need for the
understanding of muzzle exit flows due to the common practice of designing
deployable fins that open upon muzzle exit. Knowledge of this base pressure
drop is also important for the electronics designer because so-called \“setforward”
(the rapid \“un-springing” of the projectile as it leaves the muzzle of the
gun) has been identified as the cause of many component failures. An empirical
relationship is developed for the base pressure drop in a 155 mm gun tube. This
tube utilized a standard double-baffle muzzle brake. Several Instrumented
Ballistic Test Projectiles (IBTP) were fired at various charge zones and the base
pressure drops were compared and curve fits developed. A basic exponential
decay curve with averaged coefficients was developed from the data. This
empirical model can be utilized by researchers performing Computational Fluid
Dynamics calculations as a check on results generated for the double baffle
muzzle brake configuration.
Keywords: gun launch, gun hardening, muzzle exit, shot exit, electronics,
MEMS, projectile dynamics, in-bore dynamics.
1 Muzzle exit behavior of projectiles
With today’s focus on guided, smart projectiles, more and more designs are
being developed that employ fins or other stabilization devices that are activated
upon muzzle exit. This muzzle exit activation requires detailed knowledge of the
pressure field to insure that these devices open uniformly and reliably.
Keywords
gun launch, gun hardening, muzzle exit, shot exit, electronics,
MEMS, projectile dynamics, in-bore dynamics.
Related Book
Other papers in this volume
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