水下航行体变深度发射出筒空泡数值研究

闵景新; 李云波

doi:10.6052/j.issn.1000-4750.2014.05.S003

水下航行体变深度发射出筒空泡数值研究

哈尔滨工程大学船舶工程学院,黑龙江,哈尔滨 150001

基金项目: 国家自然科学基金项目(51179036,51309060); 中央高校基本科研业务费专项基金项目(HEUCFR1204)

详细信息

作者简介:
李云波(1963―),女,黑龙江人,教授,博士,副院长,主要从事船舶阻力和流体力学领域研究(E-mail: yunboz@163.com).

通讯作者:
闵景新(1982―),男,江西人,讲师,博士,主要从事气泡减阻多相流领域研究(E-mail: minjx@163.com).

中图分类号: O351.2
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出版历程
- 收稿日期: 2014-05-05
- 修回日期: 2015-01-18
- 刊出日期: 2015-06-24

NUMERICAL SIMULATION OF TUBE-EXIT CAVITY OVER UNDERWATER PROJECTILE EJECTED FROM DIFFERENT DEPTHS

College of Shipbuilding Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China

摘要

摘要: 采用数值方法对水下航行体带均压气体出筒过程进行数值模拟,研究了发射筒内均压气体及发射深度对出筒空泡的影响。基于均值混合物多相流模型、气体状态方程、质量输运空泡模型和RNG k-ε湍流方程,并结合动网格技术,实现了水下航行体带均压气体出筒过程数值求解。通过对典型弹体模型从不同深度发射出筒过程进行数值研究,得到了出筒过程空泡形态特征和内部结构,对比分析不同发射深度空泡尾部闭合时气体弹性系数的变化规律,并与文献中理论分析结果进行了对比验证。研究结果表明：均压气体将跟随航行体运动在航行体表面形成通气空泡,气体的弹性系数将影响空泡内气体的脱落速度和空泡尾部闭合位置;相同的弹射速度下,发射深度越大,空泡尾部闭合的越早。
- 流体力学 /
- 水下航行体 /
- 数值模拟 /
- 出筒 /
- 空泡
Abstract: The influence of ejection depth and air filled in the launch tube on a tube-exit cavity was researched by numerical simulation methods during projectile ejected underwater. The ejection process was simulated based on a homogeneous multiphase flow, ideal gas state equation, homogeneous equilibrium flow cavitation model, and RNG k-ε equation combined with the dynamic mesh. The shape characteristics and inner structure of a tube-exit cavity was studied by conducted simulation on a typical underwater projectile shape model. Four types of ejection depth was simulated, and the variation of the elasticity coefficient of gas, when the tube-exit cavity closed, was also analyzed and validated with the theoretical analysis result given in the literature. The numerical results show that the even pressure gas moves with the projectile and forms a ventilated cavity on the surface of the projectile. The elasticity coefficient of the gas has great influence on the leakage speed and close point of the cavity. The deeper of the ejection, the earlier cavity closed with the same ejecting speed.
- fluid mechanics /
- underwater projectile /
- numerical simulation /
- tube-exit /
- cavity

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参考文献(15)

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