A Preliminary Study of the Feasibility of Using a Pressurized Tube for the Soft Recovery of a Five Inch Projectile.

摘要

The report presents the results of a preliminary study of the possibility of using a pressurized tube to recover a standard five inch projectile with projectile decelerations no greater than 10% of the maximum in-bore acceleration. Computer calculations using both a simplified dynamics model and a one-dimensional Lagrangian hydrocode have been performed for a variety of recovery tube gases,initial pressures and tube lengths. Calculations were also made for tubes vented by blowing plugs out of the ends. Results of the calculations indicate that an initial pressurization of five to seven atmospheres is required to stop the projectile within the 10% limitation if a dense gas such as sulfur hexafluoride or Freon 12is used. The required tube length is approximately 300feet. (Author)