航速对舰船气泡尾流几何特性的影响

田雪冰; 顾建农; 张志宏; 王冲

doi:10.11993/j.issn.1673-1948.2010.04.007

航速对舰船气泡尾流几何特性的影响

doi: 10.11993/j.issn.1673-1948.2010.04.007

海军工程大学理学院, 湖北武汉, 430033

基金项目: 湖北省自然科学基金(2003ABA051), 海军工程大学自然科学研究基金(20080605000007)

详细信息

作者简介:
田雪冰( 1985- ) , 男, 在读硕士, 主要研究方向为流体力学.

中图分类号: TJ630.34
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- 被引次数: 0
出版历程
- 收稿日期: 2009-09-29
- 修回日期: 2010-03-16
- 刊出日期: 2010-08-30

Effect of Ship Speed on Bubble Wake Geometry Characters

Science College, Naval University of Engineering, Wuhan 430033, China

摘要

摘要: 为了了解航速对舰船气泡尾流几何特性的影响, 探索不同尺度的气泡在尾流中的作用规律, 为气泡尾流的声探测以及鱼雷的尾流自导提供理论依据, 该文采用抛物化的雷诺平均纳维斯托克斯(PRaNS)方程、气泡输运方程及k-ε 两方程湍流模式, 对2类典型船型的远场气泡尾流场进行了建模与分析, 数值估算了舰船尾流中气泡数密度的分布特征,比较了不同航速下气泡尾流几何特性的差异, 并与实测结果进行了比较, 二者吻合得较好。计算结果表明, 航速对气泡尾流的几何分布形状影响不大, 但对尾流中气泡浓度的大小影响明显。航速越大, 相同尾龄时的气泡数密度也越大, 尾流特征越明显; 在尾流不同尺度的气泡中, 半径10 μm 的气泡尾流浮升角最大; 半径52 μm的气泡尾流浮升角最小, 半径30~ 50 μm 的气泡存活时间最长, 所以对气泡尾流的探测应以半径30~ 50 μm的气泡为主。
- 鱼雷 /
- 气泡 /
- 尾流 /
- 航速 /
- 舰船 /
- 声探测
Abstract: In order to understand the effect of ship speed on bubble wake geometry characters, explore the effect law of different scale bubbles on wake, and provide theoretical basis for acoustic detection of ship bubble wake and torpedo wake homing, this study adopts parabolic Reynolds-averaged Navier-Stokes ( PRaNS) equations, the bubble transport equation and the k-ε turbulence model are used to estimate the bubble number density distribution in ship’s far field wakes, numerically simulates the ship bubble wake geometry characters under different speeds for two typical ships, and the results agree well with the experiments. It shows that ship speed has little effect on bubble wake geometry distribution, but has significant effect on bubble number density in ship wakes. The faster the speed of ship, the higher the bubble number density in the ship wakes with same wake age, and the clearer the wake character. The bubbles with 10 μm radius have the largest elevation, the bubbles with 52 μm radius have the smallest elevation, and the bubbles with radius between 30~ 50 μm live longest. So the wake detection should be focused on the bubbles with radius between 30~ 50 μm.
- torpedo /
- bubble /
- wake /
- speed /
- ship /
- acoustic detection

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参考文献(8)

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