超音速圆柱射弹斜入水流固耦合数值计算  

Numerical Simulation of Fluid-structure Interaction of Cylindrical Projectile with High Velocity Inflow

作　　者：张硕 胡明勇[1] 孟庆昌[1] 易文彬 ZHANG Shuo;HU Ming-yong;MENG Qing-chang;YI Wen-bin(Dept.of Basic Courses,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学基础部,武汉430033

出　　处：《船海工程》2022年第5期26-31,共6页Ship & Ocean Engineering

基　　金：国家自然科学基金(51309230);装备预研共用基金(9140A13050215JB11191);海军工程大学科学发展基金(425317Q003,425317Q004);海军工程大学基础部基金(HGDJCB17ZK005)。

摘　　要：超音速射弹入水时,流体可压缩性对空泡演化过程的影响、射弹运动对流体动力学特性的影响等是入水问题的难点,基于流体体积(VOF)多相模型和流体结构相互作用模型(FSI),使用STAR-CCM+软件的重叠网格技术,利用用户自定义函数确定水的密度变化规律,建立超音速射弹斜入水计算模型。获得初始马赫数与长径比对超音速射弹斜入水时射弹速度、载荷和应力的影响规律以及对空泡演化、流场压强变化的影响规律,结果发现,射弹入水时,弹体会拍击流体导致射弹不断绕头部小幅度震荡,进而影响射弹阻力系数变化与弹体应力分布。The influence of fluid compressibility upon cavitation evolution and the influence of projectile motion upon hydrodynamic characteristics are the difficulties in simulation of water-entry of super-cavitating projectile.The overlapping grid technology in Star-CCM+,the user-defined functions were used to determine the density change of water.The calculation model of supersonic projectile oblique entry into water was established based on fluid of volume(VOF)multiphase model and fluid-structure interaction(FSI)model.The influence laws of initial Mach number and length-diameter ratio on velocity,load and stress of supersonic projectiles,cavitation evolution and pressure change of flow field were calculated.The results showed that when the projectile enters water,the projectile constantly oscillates around the head due to its flapping fluid,which affects the change of projectile resistance coefficient and the stress distribution of projectile body.

关 键 词：流固耦合 欧拉多相流 超空泡射弹 超音速 

分 类 号：U674.7[交通运输工程—船舶及航道工程]