不同扰动角速度高速射弹入水弹道特性

Water entry trajectory characteristics of high-speed projectiles with various turbulent angular velocity

为深入了解高速射弹入水运动情况,基于入水弹道学和超空泡流体动力理论,建立了弹体纵向运动的动力学模型,对弹体模型以不同扰动角速度入水的过程进行了弹道仿真,得到了弹体入水轨迹、速度、俯仰角和俯仰角速度的变化规律,并分析扰动角速度对其影响.研究结果表明,随着尾拍次数的增加,弹体尾部浸入水中的深度逐渐增大,尾拍所持续的时间也逐渐增长,尾拍后的俯仰角速度随尾拍次数的增加先变大,然后增幅逐渐减小,或者俯仰角速度随尾拍次数的增加变大后略微减小,扰动角速度越大,相同时间内弹体发生尾拍的次数就越多,尾拍发生的就越早,弹体在空泡腔内运行的时间就越短.

The state before and after water entry of high-speed projectiles was analyzed based on water entry ballistics and hydrodynamics and the dynamics model of projectile longitudinal motion was built. The trajectory simulation during water entry process of high-speed projectile with various turbulent angular velocity was estimated. The change rules of trajectory and velocity of focus, pitch angle, pitch angular velocity were obtained, and the influence of turbulent angular velocity was analyzed. The results show that with increasing of tail slapping frequency, the immersion depth of the trajectory tail increases and the continuous time increases. Moreover with tail slapping frequency increasing, the pitch angular velocity after tail slapping increases, then the increasing extent decreases or the pitch angular velocity decreases slightly. The bigger the turbulent angular velocity is, the more times the tail slaps in the same time happen, the earlier the tail slapping happens, and the shorter the moving time of the projectile is in cavitation chamber.