Numerical Studies on Cavity Flows Induced by High-speed Oblique Water Entry of a Cone Projectile
High-speed water entry of a cone projectile is great important to its navigation performance and structural safety.This paper investigates the detailed evolution procedure of the high-speed oblique water entry.The cavity flow evolution,fluid dynamic characteristics,and trajectory stability are examined.A numerical model is established based on Reynolds average Navier-Stokes equations with Realizable k-ε turbulence model.Accuracy of the present model is validated in comparison with the model experiment.High-speed oblique water entry of a cone projectile is simulated under different inclination angles.The comprehensive process of the water entry including initial impact,formation,development,contraction,closure,and collapse of the open cavity are captured.Closing time of the open cavity is advanced with the increase of the inclination angle.Huge slamming load on the projectile surface and local high impulsive pressure on the projectile nose is generated in the initial slamming stage.The peak value of the force increases with the increase of the inclination angle.In addition,as the inclination angle increases,the deflection angle and lateral displacement of the projectile is reduced,which results in better ballistic stability.
cone projectilehigh-speed water entrycavity flowinclination anglenumerical simulation
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