BALLISTIC PERFORMANCE OF A PROJECTILE WITH A DEVELOPED BOATTAIL | ||||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||||
| Article 18, Volume 15, 15th International Conference on Applied Mechanics and Mechanical Engineering., May 2012, Page 1-18 PDF (871.38 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/amme.2012.36915 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| E. El-Awwad; A. Z. Ibrahim; A. M. El-Sebae; A. M. Riad | ||||
| Egyptian Armed Forces. | ||||
| Abstract | ||||
| ABSTRACT A computational study using Reynolds-Averaged Navier-Stokes (RANS) equations has been carried out to investigate air flow past projectiles provided with nonaxisymmetric boattail at transonic and supersonic speeds. The non-axisymmetric boattail is formed by cutting the conventional boattail with three flat surfaces having inclination angle of ten degrees. The present study aims to discuss the effect of the existence of these flat surfaces on the air flow characteristics compared to typical projectile having the same base area. One of the study main concerns is the drag and it impact on the projectile trajectory. The present study shows that the existence of flat surfaces on the new unconventional projectile boattail is a reason of weakening the shock wave formed on the boattail. The wake behind the unconventional projectile base is smaller than that of the conventional model. Moreover, the unconventional projectile has a lower pitching moment than the typical projectile at angle of attack of three degrees. | ||||
| Keywords | ||||
| Aerodynamics; CFD; Projectiles; non-axisymmetric boattail; triangular boattails; Drag reduction | ||||
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