Abstract:

With the purpose of obtaining the minimum drag coefficient of a normal hollow projectile, based on RANS governing equations and 2nd-order AUSM scheme, the two-dimensional flow fields and aerodynamic forces of different shapes of hollow projectiles have been simulated numerically, both the ex- ternal and internal flow features of hollow projectiles with different shapes are obtained, as well as the drag variation curves and the aerodynamic shape of the hollow projectile with the minimum drag coeffi- cient. Moreover, the projectile with minimum drag coefficient and normal projectile with ultrasonic sound flow fields are simulated respectively, the flow characteristics of them are discussed and compared, and the minimum drag effect of the obtained projectile is validated, our numerical results can provide impor- tant guidance for relative investigations.

Key words: fluid mechanics, hollow projectile, tubular projectile, drag coefficient, flow field