Influence of head structure on the underwater motion characteristics of supercavitating projectile
Aiming at the problems of simple structure and poor stability of underwater vehicles at home and abroad,a two-stage supercavitation gun was proposed based on overlapping grid technology and 6DOF dynamic grid technology.The projectile adopts a two-stage oblique shoulder structure and suffers less water resistance during underwater navigation,so it has high research value.To this end,the effects of three different warhead structures on the cavitation morphology,ballistic and hydrodynamic characteristics of supercavitation bullets during underwater motion were studied.The results show that the flat head projectile produces two stages of cavitation while the pointed head projectile and the round head projectile only produce one stage of cavitation.The fit between the round head projectile and the inclined shoulder is higher.The ballistic stability of round projectile is better,followed by flat projectile,and the ballistic stability of pointed projectile is the worst.At the initial stage when the projectile meets the water,it produces a resistance peak,and with the movement of the projectile,the resistance gradually decreases.The influence of external force on the round head projectile is the least,and the influence of external force on the pointed head projectile is the greatest.Therefore,the round head projectile has the best underwater ballistic stability and the best drag reduction performance,which provides a certain theoretical basis for the structure selection of supercavitation projectile.
head structuresupercavitation projectileunderwater motioncavity shapeballistic charac-teristics
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