轴向发射间距对水下炮击时气蚀干扰和载荷特性的影响

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN Applied Ocean Research Pub Date : 2024-10-22 DOI:10.1016/j.apor.2024.104281
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引用次数: 0

摘要

本文分析了发射间隔对水下礼花弹空化流干扰和载荷特性的影响。研究采用了改进的延迟分离涡模拟和施纳尔-绍尔空化模型、流体体积(VOF)多相流模型和重叠网格。此外,还设计了减压实验系统,发现数值模拟与实验结果非常吻合,从而验证了模拟的有效性。对多相流场和载荷分布进行了详细讨论。结果显示了空腔自上而下的塌陷过程,塌陷末端收缩为一个孤立的气泡。同步塌陷压力的特点是峰值脉冲宽度短,均位于空腔的最下部。在水下阶段,当轴向发射间距介于弹丸长度的 0.5 倍和 1.0 倍之间时,第二枚弹丸的头部作用于第一枚弹丸质心以下的区域。这导致初始空腔逐渐稳定,质量中心向内侧的偏差减小。尽管由于第一台发动机尾流的干扰,第二颗弹丸的内腔出现了大面积的断裂和脱落,但其运动稳定性依然完好无损。在出水阶段,当轴向发射间距介于弹丸长度的 0.75 倍和 1 倍之间时,会引起第二个弹丸内腔的膨胀和收缩。但是,可能会出现不对称的同步坍塌载荷,导致运动姿态不稳定。
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Effects of axial launch spacing on cavitation interference and load characteristics during underwater salvo
This paper analyzes the effect of launch interval on cavitation flow interference and load characteristics during underwater salvo. The study employs the Improved Delayed Detached Eddy Simulation and the Schnerr-Sauer cavitation model, Volume of Fluid (VOF) multiphase flow model, and overlapping grid. Additionally, decompression experiment systems are designed, and numerical simulations are found to be in good agreement with experimental results, thus verifying the effectiveness of the simulation. Detailed discussions are provided on multiphase flow field and load distribution. The results reveal a top-down collapse process of the cavity, with collapse shrinking to an isolated bubble at the end. Synchronized collapse pressure is characterized by short pulse widths at the peaks, all located at the lowermost part of the cavity. During the underwater stage, when the axial launch spacing ranges between 0.5 times and 1.0 times the length of the projectile, the head of the second projectile acts on the area below the center of mass of the first. This leads to gradual stabilization of the initial cavity and a decrease in deviation of the center of mass toward the inside. Despite experiencing large-scale fracture and detachment due to interference from the wake of the first engine, the motion stability of the inside cavity of the second projectile remains intact. In the water exit stage, when the axial launch spacing ranges between 0.75 times and 1 time the length of the projectile, it causes expansion and contraction of the inside cavity of the second projectile. However, asymmetric synchronous collapse loads may occur, leading to unstable motion posture.
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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
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