为了研究引信外形对弹丸气动特性的影响,通过Fluent软件对装配不同外形引信的57mm口径人工增雨防雹弹弹丸的阻力特性进行仿真,得到了不同外形下阻力系数与马赫数的关系曲线。弹头引信头部轮廓形状的微小变化如锥角变化对阻力系数影响不大,顶部形状为圆头和平头时,阻力系数稍有差别,总体影响较小。弹底引信外露部分长短对阻力系数影响较大,外露部分增长会减小阻力系数。弹底引信有凸出部位时,其阻力系数等于和其全长等长的弹丸的阻力系数。

In order to research the influence of fuze shape on aerodynamic characteristics of hypersonic projectile, Fluent software was used to calculate coefficient of resistance of 57 mm caliber weather modification projectiles with point fuzes and base fuzes of different shapes. The curve of coefficient of resistance and Mach number with different shapes was got. The result shows that the shape of point fuze of 57 mm caliber weather modification projectiles has little influence on the coefficient of resistance:The coefficient of resistance has some difference when the top shape changes, but the influence is small overall. The coefficient of resistance increases when the length of the exposed parts of the base fuze reduces. When the base fuze has a prominent position, the coefficient of resistance of the projectile is close to the projectile whose length is equal to its full length.