球体垂直入水空泡实验研究

马庆鹏; 何春涛; 王聪; 魏英杰; 路中磊; 孙健

doi:10.11883/1001-1455(2014)02-0174-07

球体垂直入水空泡实验研究

doi: 10.11883/1001-1455(2014)02-0174-07

1.
哈尔滨工业大学航天学院，黑龙江哈尔滨150001
2.
北京机械设备研究所，北京100854

基金项目: 中央高校基本科研业务费专项项目（HIT.NSRIF.201159）

详细信息

作者简介:
马庆鹏(1988—), 男, 博士研究生

中图分类号: O351.2
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出版历程
- 收稿日期: 2012-09-12
- 修回日期: 2012-12-24
- 刊出日期: 2014-03-25

Experimental investigation on vertical water-entry cavity of sphere

1.
School of Astronautics, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
2.
Beijing Mechanical Equipment Institute, Beijing 100854, China

More Information

Corresponding author: Ma Qing-peng, qingpengma@gmail.com

摘要

摘要: 针对球体垂直入水问题开展了实验研究，分析了入水空泡的形成、发展、闭合及溃灭过程。通过开展不同初始入水速度及表面沾湿状态的实验研究，得到了入水速度及表面沾湿状态对球体入水空泡流场的影响，同时分析了球体在垂直入水过程中的位移、速度、加速度以及阻力因数。结果表明，球体在水下的运动参数具有较强的非线性特性，速度较高、入水空泡深闭合的条件下，球体的运动参数及阻力因数曲线具有明显的波动。
- 流体力学 /
- 入水空泡 /
- 入水 /
- 球体 /
- 运动参数
Abstract: Experimental investigations and analysis were carried out on the vertical water-entry of the spheres.The development process of the cavities induced by the vertical water-entry of the spheres was discussed including the formation, open, closure and collapse of the cavities.The influences of the water-entry velocities and surface conditions of the spheres on the cavities were experimentally obtained.And the displacements, velocities, accelerations and drag coefficients of the spheres during the water entry were analyzed.The investigated results show that the motion parameters of the spheres present highly nonlinear characteristics.And there are obvious fluctuations of the motion parameters and the drag coefficients during the closed-cavity phase if the water-entry velocities are high.
- fluid mechanics /
- water-entry cavity /
- vertical water-entry /
- sphere /
- motion parameter

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图 1 入水实验系统示意图

Figure 1. Schematic of the water-entry experiment

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图 2 球体垂直入水空泡的发展过程

Figure 2. Development of vertical water-entry cavity of sphere

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图 3 空泡敞开阶段

Figure 3. The open phase of the cavity

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图 4 空泡溃灭高速射流

Figure 4. High-speed jet flow during the collapse phase of the cavity

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图 5 不同入水速度条件下球体垂直入水空泡的发展过程

Figure 5. Development of vertical water-entry cavities of spheres with different entry velocities

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图 6 入水速度不同的球体垂直入水的运动参数和阻力因数

Figure 6. Motion parameters for spheres in vertical water entry with different entry velocities as well as drag coefficients

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图 7 表面沾湿状态不同的球体入水空泡的演化

Figure 7. Development of vertical water-entry cavities of spheres with different wetting surfaces

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图 8 表面沾湿状态不同的球体入水的运动参数和阻力因数

Figure 8. Motion parameters for spheres in vertical water entry with different wetting surfaces as well as drag coefficients

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