Simulation on Impact Load and Cavity Shape in High Speed Vertical Water Entry for an Axisymmetric Body
-
摘要: 回转体入水问题对导弹、鱼雷等的外形和弹道设计有着深远影响。本文利用商业软件FLUENT 6.3, 结合动网格技术和用户自定义函数(UDF), 使用混合物(MIXTURE)模型对平头、锥头和圆头回转体在速度为50~150 m/s时的入水过程进行了仿真试验, 探究速度和头型对其入水冲击载荷和空泡形态的影响。试验结果表明, 回转体高速入水冲击载荷峰值发生在入水初期, 且速度增大时, 回转体冲击载荷、空泡直径和长度亦随之增大, 在速度相同的情况下, 回转体冲击载荷、空泡直径和长度按平头、锥头、圆头的次序依次减小。Abstract: The problem of high-speed water entry of an axisymmetric body greatly influences the design of shape and trajectory for a torpedo or a missile. This paper simulates the impact and cavity shape in water entry of different head shapes, such as flat head, cone head, and round head, at the velocity between 50 ~150 m/s with the commercial software FLUENT6.3 combining with the dynamic mesh, user-define function(UDF) and MIXTURE model. Conclusions are drawn that the peak of impact load appears in the primary period of the water entry; the impact load and the cavity′s length and diameter increase with the increasing velocity; while the impact load and the cavity′s length and diameter decrease in the order of flat head, cone head, and round head when the bodies have same velocity.
-
Key words:
- axisymmetric body /
- water entry impact /
- cavity shape /
- MIXTURE model /
- impact load
-
[1] Von Karman T. The Impact of Seaplane Floats During Land-ing[R]. Washington DC: National Advisory Committee for Aeronautics, NACA Technical Notes 321, 1929. [2] 陈宇翔, 郜冶, 刘乾坤. 应用VOF方法的水平圆柱入水数值模拟[J]. 哈尔滨工程大学学报, 2011, 32(11): 1439- 1442.Chen Yu-xiang, Gao Ye, Liu Qian-kun. Numerical Simu-lation of Water-entry in a Horizontal Circular Cylinder Using the Volume of Fluid (VOF) Method[J]. Journal of Harbin Engineering University, 2011, 32(11): 1439-1442. [3] 王永虎. 空投雷弹入水冲击头型特性参数分析[J]. 航空计算技术, 2010, 40(11): 14-17.Wang Yong-hu. Nose Performance Description Coeffi- cience of Airborne Torpedo and Deep-mine during Water- entry Impact[J]. Aeronautical Computing Techbique, 2010, 40(11): 14-17. [4] 何春涛, 王聪, 魏英杰, 等. 垂直入水空泡内部压强分布数值研究[J]. 船舶力学, 2011, 15(9): 960-968.He Chun-tao, Wang Cong, Wei Ying-jie, et al. Numerical Simulation of Pressure Distribution in Vertical Wa-ter-entry Cavity[J]. Journal of Ship Mechanics, 2011, 15(9): 960-968. [5] 张宇文. 鱼雷弹道与弹道设计[M]. 西安: 西北工业大学出版社, 1999. [6] Neaves M D, Edwards J R. All-Speed Time-Accurate Underwater Projectile Calculations Using a Precondition-ing Algorithm[J]. Journal of Fluids Engineering, 2006, 128(2): 284-296. [7] 安伟光, 蒋运华, 安海. 运动体高速入水非定常过程研究[J]. 工程力学, 2011, 28(3): 251-256.An Wei-guang, Jiang Yun-hua, An Hai. The Unsteady Water Entry Process Study of High-speed Vehicle[J]. Engineering Mechanics, 2011, 28(3): 251-256. -
点击查看大图
计量
- 文章访问数: 1152
- HTML全文浏览量: 6
- PDF下载量: 563
- 被引次数: 0
下载:
