超空泡射弹异步并联入水流场与运动特性研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (16) : 167-176.

论文

闫雪璞，鹿麟，王辰，李强，胡彦晓

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A study on flow field characteristics and motion characteristics of two supercavitating projectiles in asynchronous parallel water-entry

YAN Xuepu,LU Lin,WANG Chen,LI Qiang,HU Yanxiao

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摘要

为研究超空泡射弹异步并联入水性能，基于Fluent流体仿真软件，采用有限体积法、VOF多相流模型以及重叠网格技术建立了超空泡射弹异步并联入水数值方法，利用高速摄影机及轻气炮进行了单发射弹高速入水试验，通过对比仿真结果与试验结果验证了数值方法的可靠性。在此数值方法的基础上，分别对弹丸初始纵向间距为0，0.5，1.0，1.5，2.0及3.0倍弹长时并联超空泡射弹入水的过程进行了数值模拟，并对比分析了不同纵向间距下两发射弹的流场特性与运动特性。研究结果表明，异步并联弹丸空泡间的耦合关系与同步并联相比变化明显。当初始纵向间距为0.5倍弹长时，弹1空泡受到弹2空泡的剧烈挤压，弹1右侧刺破空泡发生一次尾拍；当初始纵向间距为3倍弹长时，弹2受弹1空泡干扰明显，入水后期弹丸完全失稳。相比起同步并联，异步并联时弹2所受入水冲击载荷较小，并且随着初始纵向间距由0增加到3倍弹长，弹2所受入水冲击载荷呈现递减趋势。
关键词：异步并联入水；空泡演化；运动特性；数值模拟；入水实验

Abstract

Based on Fluent fluid simulation software, and used the finite-volume method, VOF multiphase flow model and overlapping grid technique, a numerical method for parallel entry of supercavitating projectiles into water is established to study the water entry performance of supercavitating projectiles in asynchronous parallel. The high-speed water entry experiment of single projectile is carried out by using high-speed camera and light gas gun. The reliability of the numerical method is verified by comparing the simulation results with the experimental results. On the basis of this numerical method, the water entering process of parallel supercavitating projectiles with initial longitudinal spacing of 0，0.5，1，1.5，2 and 3 times of projectile length is numerically simulated, and the flow field characteristics and motion characteristics of two projectiles with different longitudinal spacing are compared and analyzed. The results show that the coupling relationship between the cavities of the asynchronous parallel projectile is different from that of the synchronous parallel projectile; When the initial longitudinal distance is 0.5 times of the length of the projectile, the cavity of projectile 1 is squeezed violently by the cavity of projectile 2, and the right side of projectile 1 pierces the cavity and a tail beat occurs; When the initial longitudinal distance is three times the length of projectile, the cavitation interference of projectile 2 by projectile 1 is obvious, and the projectile is completely unstable in the later stage of water entering; Compared with synchronous parallel, the impact load of projectile 2 in asynchronous parallel is smaller. And as the initial longitudinal spacing increases from 0 to 3 times the projectile length, the impact load of projectile 2 shows a decreasing trend.
Key words: asynchronous parallel water-entry；cavitation evolution；motion characteristics；numerical simulation；water-entry experimental

导出引用

闫雪璞，鹿麟，王辰，李强，胡彦晓. 超空泡射弹异步并联入水流场与运动特性研究[J]. 振动与冲击, 2022, 41(16): 167-176

YAN Xuepu,LU Lin,WANG Chen,LI Qiang,HU Yanxiao. A study on flow field characteristics and motion characteristics of two supercavitating projectiles in asynchronous parallel water-entry[J]. Journal of Vibration and Shock, 2022, 41(16): 167-176

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