Numerical simulations in obtaining drag reduction for projectile with base bleed
An artillery projectile in flight produces a low pressure area immediately behind the projectile which creates a force called base drag which lessens the velocity of the projectile. It is known that theoretically this base resistance can be reduced or even eliminated by allowing a stream of hot gas...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Military Technical Institute, Belgrade
2016-01-01
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| Series: | Scientific Technical Review |
| Subjects: | |
| Online Access: | https://scindeks-clanci.ceon.rs/data/pdf/1820-0206/2016/1820-02061602036B.pdf |
| Summary: | An artillery projectile in flight produces a low pressure area immediately behind the projectile which creates a force called base drag which lessens the velocity of the projectile. It is known that theoretically this base resistance can be reduced or even eliminated by allowing a stream of hot gas to flow out of the base surface of the projectile in a suitable manner. The effect produced by this stream of hot gas is called base-bleed effect. The internal ballistic calculation of existing base bleed configuration is presented in the paper. A numerical simulation of axisymmetric body projectiles was obtained with the Reynolds Averaged Navier-Stokes (RANS) computational fluid dynamics software (CFD). Also, two turbulence models were tested and validated with the semi empirical prediction. The realizable k-ɛ turbulence model was chosen for calculation of aerodynamic drag of the projectile with and without base bleed effect. Computed result show a drag reduction with base bleed of about 12% in supersonic flow regime. |
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| ISSN: | 1820-0206 2683-5770 |