楔形头杆状弹体高速入水弹道及动力载荷特性研究OA

Wedge-nosed rod-like projectiles exhibit complex hydrodynamic characteristics during high-speed water entry,with their trajectory deflection and load distribution significantly influenced by the non-uniform flow fields.To further reveal the water entry dynamics of asymmetric projectiles,a three-dimensional numerical model was established based on the Star-CCM+platform.The model incorporates the SST k-ω turbulence model,Volume of Fluid(VOF)interface-capturing method,and overset grid technique.The Schnerr-Sauer cavitation model was employed to describe the phase transition process of cavities.Numerical simulations were conducted for water entry velocities ranging from 100 to 900 m/s and wedge angles of 30°,45°,60°,and 90°.The trajectory deflection,axial acceleration,pressure response,and spatiotemporal load distribution during water entry were systematically investigated.The numerical results were validated against experimental data.The results indicate that the projectile deflects toward the non-chamfered side during water entry.The deflection speed of the projectile increases as the wedge angle decreases and the impact velocity increases.The axial acceleration of the projectile centroid exhibits two distinct peaks:the first peak is caused by the initial impact upon water entry,while the second peak results from the collision between the projectile tail and the cavity wall after a certain degree of deflection,leading to a secondary increase in acceleration.In addition,the load peak gradually decreases over time and shifts from the nose to the tail during water entry.This study provides a theoretical reference for the structural optimization design,water entry trajectory control,and related engineering applications of wedge-nosed projectiles.