Wind-Tunnel Drag Measurements of a Ball-Obturated Tubular Projectile

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NPS69-82-002.pdf (893.06 KB)
Authors
Nunn, R.H.
Bry, W.A.
Subjects
Aerodynamics
Tubular projectile
Base drag
Advisors
Date of Issue
1982-06
Date
June 1982
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Drag measurements and Schlieren flow visualizations 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 rang 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 part of the drag reduction due to ball opening is obtained during the final motion of the ball and the partially open condition may lead to drags above those of the standard projectile. Particularly at the lower Mach numbers. With the ball closed, the projectile configuration is dominated by bluff-body drag and the drag on the ball itself may be estimated by the previously espoused theory.
Type
Technical Report
Description
Approved for public release; distribution is unlimited.
URI
https://hdl.handle.net/10945/66318
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
NPS69-82-002
Sponsors
Technology Programs Management Office (Code 3205)
Naval Weapons Center, China Lake, California
Funder
N60530-WR30134
Format
30 p.
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, it may not be copyrighted.
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