Significant Early-Time Transient Projectile Acceleration with Concomitant Minimal Pressure Waves.
Abstract
Recent tests have demonstrated that severe early-time transient projectile accelerations can be produced by a propelling charge assembly that generates only minimal traveling pressure waves in the chamber. Five igniter designs consisting of four rapid ignition propagation (RIP) igniters and one standard black powder igniter were tested in the new Navy 8-in. Major-Caliber Lightweight Gun using simulated 8-in. Extended-Range Guided Projectiles. The magnitude of the early-time projectile setback acceleration, when firing the HIVELITE-ignited charges, was an order of magnitude less than that experienced with charges ignited by the other igniters. Gun chamber pressures measured during these tests showed that pressure waves were minimal for all of the igniters. Analysis of these pressure records produced no evidence that the observed high level projectile loading should be expected. Hence, the projectile loading attributed to propellant grain and case plug impact was substantial even when overall pressure gradients were minimal. Since projectile loading cannot always be deduced from chamber pressure data alone, projectile loading must be measured in live propellant bed tests in order to determine whether serious setback loading is imparted to the projectile. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1978
- Accession Number
- ADA067971
Entities
People
- C. T. Boyer Jr
Organizations
- Naval Surface Warfare Center Dahlgren Division