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Numerical investigation of water-entry characteristics of high-speed parallel projectiles
International Journal of Naval Architecture and Ocean Engineering ( IF 2.2 ) Pub Date : 2021-07-08 , DOI: 10.1016/j.ijnaoe.2021.05.003
Lin Lu 1 , Chen Wang 1 , Qiang Li 1 , Prasanta K. Sahoo 2
Affiliation  

In this study, an attempt has been made to investigate the water-entry characteristics of the high-speed parallel projectile numerically. The shear stress transport k-ω turbulence model and the Zwart-Gerber-Belamri cavitation model based on the Reynolds-Averaged Navier–Stokes method were used. The grid independent inspection and grid convergence index is carried out and verified. The influences of the parallel water-entry on flow filed characteristics, trajectory stability and drag reduction performance for different values of initial water-entry speed (v0 = 280 m/s, 340 m/s, 400 m/s) and clearance between the parallel projectiles (Lp = 0.5D, 1.0D, 2.0D, 3.0D) are presented and analyzed in detail. Under the condition of the parallel water-entry, it can be found that due to the intense interference between the parallel projectiles, the distribution of cavity is non-uniform and part of the projectile is exposed to water, resulting in the destruction of the cavity structure and the decline of trajectory stability. In addition, the parallel projectile suffers more severe lateral force that separates the two projectiles. The drag reduction performance is impacted and the velocity attenuation is accelerated as the clearance between the parallel projectiles reduces.



中文翻译:

高速平行弹入水特性数值研究

本研究试图对高速平行弹丸的入水特性进行数值研究。使用基于 Reynolds-Averaged Navier-Stokes 方法的剪切应力传输k - ω湍流模型和 Zwart-Gerber-Belamri 空化模型。网格独立检查和网格收敛指标进行验证。不同入水速度( v 0  = 280 m/s, 340 m/s, 400 m/s)和间隙下平行入水对流场特性、轨迹稳定性和减阻性能的影响平行弹丸 ( L p  = 0.5 D , 1.0 D , 2.0D , 3.0 D ) 进行了详细介绍和分析。在平行入水条件下,可以发现由于平行弹丸之间的强烈干扰,空腔分布不均匀,部分弹丸暴露在水中,导致空腔破坏结构和轨迹稳定性的下降。此外,平行弹丸会受到更严重的侧向力,将两个弹丸分开。随着平行弹丸之间的间隙减小,减阻性能受到影响并且速度衰减加速。

更新日期:2021-07-08
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