高速射弹小角度入水数值模拟研究  

Numerical Simulation of Water Entry for High-Speed Projectile at Small Angle

作　　者：祁晓斌 刘喜燕 王瑞[1] 苗圃[1] 李瑞杰 QI Xiaobin;LIU Xiyan;WANG Rui;MIAO Pu;LI Ruijie(Northwest Institute of Mechanical and Electrical Engineering,Xianyang 712099,China;School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 712072,China)

机构地区：[1]西北机电工程研究所,咸阳712099 [2]西北工业大学航海学院,西安712072

出　　处：《中国造船》2022年第3期31-39,共9页Shipbuilding of China

摘　　要：采用基于RANS方程的CFD方法,结合VOF多相流模型和动网格技术,并考虑水的可压缩性,研究带尾翼射弹高速小角度入水时的空泡发展和弹体姿态变化,分析入水角和入水攻角对射弹运动稳定性的影响。研究发现,射弹入水初期空泡呈现不对称性,锥段部分区域沾湿,导致弹体抬头而形成正攻角,加剧了空泡的不对称性,从而引起跳弹和失稳。随着入水角增大,射弹入水稳定性增强。负攻角可以增强射弹入水稳定性,稳定性随负攻角的增大而增强;在正攻角下射弹稳定性随着攻角增大呈现先增强后降低的变化。For water entry of a projectile at small angle, the RANS equation-based CFD method together with multiphase flow VOF model and dynamic grid technology are applied to study the development of entering cavitation and change of the attitude of the projectile under different initial conditions, Effects of entry angle and attack angle on the stability of projectile are analyzed. It is found that at the initial entry stage, an asymmetric cavitation presents, and the wet area on the cone surface leads to positive attack angle, which will intensify asymmetry of the cavitation and result in jumping phenomenon of the projectile. With the increase of the entry angle, stability of the projectile is enhanced. Negative attack angle can enhance the entry stability of the projectile. Projectile stability will increase first and then decrease with positive attack angle.

关 键 词：超空泡射弹 小角度入水 入水弹道稳定性 CFD数值模拟 

分 类 号：O368[理学—流体力学]