弹丸入水空泡实验和入水弹道速度计算

The Vacuole Experiment and Computation of the Trajectory Velocity when the Projectile Entering into Water

为了建立高速弹丸入水弹道的计算模型,利用数字式高速摄影机记录了普通制式枪弹和球形弹丸入水的水中弹道和空泡形状.实验结果表明,普通制式枪弹的水中弹道稳定性没有球形弹丸稳定性好.运用空腔膨胀理论,对弹后空腔的形成和变化进行了分析.建立了球形弹丸水平入水弹道的速度计算模型,并对计算与实验结果进行了比较,二者一致性较好.

In order to establish the computation model of the trajectory when the projectile entering into water, the patter of the trajectory and vacuole of the ordinary bullet and the spherical cannonball in the water when they entering into water are recorded. Using digital highspeed camera. The experimental result indicates that the stability of trajectory of the ordinary bullet in water is not better than that of the spherical cannonball. Using the cavity expansion theory, the cavity formation and variation behind the projectile in water are analyzed. The velocity computation model of the trajectory of the spherical cannonball is set up when it entering into the water horizontally. The experimental result is compared with the computation, indicating that their coincidence is good.