Wind-Tunnel Drag Measurements of a Ball-Obturated Tubular Projectile
Abstract
Drag measurements and Schlileren flow visulalizations have been obtained for a prototype ball-obturated tubular projectile. The test range included Mach numbers of 1.94, 2.88, and 4.00 and a full range of obturator positions was surveyed at each Mach number. The results indicate that with the ball partially open the projectile internal flow field is severely complicated by combined viscous and shock wave interactions. A large of the drag reduction due to ball opening is obtained during the final motion o the ball and the partially open condition may lead to drags above those of the standatrd projectile, particularly at the lower Mach numbers. With the ball closed, the projectile configuration is dominated by bluff-body drag on the ball itself may be estimated by the previously espoused theory. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1982
- Accession Number
- ADA117268
Entities
People
- R. H. Nunn
- W. A. Bry
Organizations
- Naval Postgraduate School