空化槽对弹丸水下运动特性的影响

Influence of Cavitation Groove on Movement Characteristics of Projectile Underwater

为了研究空化槽对弹丸水下运动特性的影响,基于Rayleigh-Plesset方程、6DOF模型和动网格技术,利用CFD软件对无空化槽弹丸与多种(不同形状,不同尺寸)有空化槽弹丸的水下运动过程进行数值模拟。分析了空化槽的形状与尺寸对弹丸水下运动的弹道稳定性和减阻特性的影响机制。结果表明:矩形空化槽有着最佳的弹道稳定性但会略微降低弹丸的水下减阻性能;空化槽的槽深越浅,弹丸的弹道稳定性越好,但其减阻性能变差。该结论对弹丸的水下弹道稳定与减阻性能研究具有参考价值,可为进一步提高弹丸水下射击精度和有效射距提供理论依据。

6DOF model and dynamic mesh technology,CFD software was used to simulate the motion process of projectiles underwater,based on Rayleigh-Plesset equation,in order to study the impact of cavitation groove on movement characteristics of projectile underwater,including no cavitation groove projectiles and various cavitation groove projectiles(with different shapes and sizes).The influence mechanism of the cavitation groove’s shape and size on movement characteristics of projectile underwater was analyzed,including ballistic stability and drag reduction characteristic.The results show that the rectangular cavitation groove has the best ballistic stability but slightly reduces the underwater drag reduction performance of the projectile;The smaller the cavitation groove depth is,the better the ballistic stability of the projectile is,but the worse the drag reduction performance is.The research has reference value for the analysis of ballistic stability and drag reduction characteristic of the projectile underwater,and can provide theoretical reference for improving the accuracy and effective range of the projectile underwater shooting.