Numerical Analysis of Projectile-Launch Tube Wall Friction Effects on Projectile Acceleration in Single-Stage Gun |
| Journal |
Materials Science Forum (Volume 566) |
| Volume |
Explosion, Shock Wave and Hypervelocity Phenomena |
| Edited by |
S. Itoh and K. Hokamoto |
| Pages |
71-76 |
| DOI |
10.4028/www.scientific.net/MSF.566.71 |
| Online since |
November, 2007 |
| Authors |
Hiroaki Miura,
Akiko Matsuo
|
| Keywords |
Interior Ballistics, Solid Propellant, Two-Phase Flow |
| Abstract |
The effects of the friction between the projectile and launch-tube wall in a single-stage gun
are examined by the interior ballistics simulations. The solid/gas two-phase flow code for
two-dimensional axisymmetric calculation is used in the simulations. In this study, one-dimensional
quasi-steady-state elastic relations are applied to the projectile in the estimation of the friction force.
The calculation method is validated by the comparison of the simulated results with the experimental
data such as the histories of the breech pressure and the projectile acceleration. The simulated results
reveal that the impact of the shock waves to the base increases the friction force acting on the
projectile. The large friction force in the tight fit case decelerates the projectile, consequently
intensifying the chamber pressure. The muzzle velocity decreases with the increase of the projectile
diameter, and this appears strongly in the low chamber pressure case. |
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