Multiphase flow field and trajectory characteristics of two supercavitating projectiles in parallel water-entry

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (10) : 292-300.

WANG Chen1, LU Lin1, QI Xiaobin2, YAN Xuepu1 , QIN Denghui3

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Abstract

The water entry condition of projectile in parallel often occurs in the actual combat environment. However, there were few studies on the parallel water entry of supercavitating projectile. Based on the overset mesh technique, the water entry process of projectile was numerically simulated by using RANS equation, Schnerr-Sauer cavitation model and Realizable k-ε turbulence model. The calculated values were in good agreement with the experimental data, which verified the effectiveness of the numerical method. The numerical simulation of projectiles with different projectile distance and different initial velocities was carried out, and the flow field characteristics and trajectory characteristics of parallel projectiles were analyzed in detail. The result shows that the close projectile distance will have an adverse effect on ballistic stability; When the initial velocity is constant, the closer the projectile distance is, the worse the symmetry of the cavitation is. And it also lead to the greater lateral force and the worse ballistic stability; The phenomenon of wetting on the inside of the projectile and velocity attenuation is more obvious in closer distance between projectile; With the increase of the projectiles distance, the interference between the projectiles will gradually weaken, and when the distance between the projectiles increases to 3D, there is almost no interference between the two projectiles.

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parallel water-entry / numerical simulation / trajectory characteristics / computational fluid dynamics

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WANG Chen1, LU Lin1, QI Xiaobin2, YAN Xuepu1,QIN Denghui3. Multiphase flow field and trajectory characteristics of two supercavitating projectiles in parallel water-entry[J]. Journal of Vibration and Shock, 2022, 41(10): 292-300

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