Experimental study of supercavitating flows induced by oblique and vertical water entry of blunt bodies
-
摘要: 对4种不同头型的钝体、以不同初始速度在小倾斜角度和垂直状态下入水，所产生的空泡流进行了的实验观察，分析了不同工况下空泡产生和发展的特性。实验结果表明：对于倾斜入水及垂直入水，圆台头和平头(即空化器均为圆盘)实验体均能形成较稳定的入水弹道；初始入水速度较低时，空泡的闭合方式为深闭合；初始入水速度较高时，空泡的闭合方式为表面闭合，且运动速度衰减得更快。测量得知，钝体倾斜入水产生的空泡的前部外形轮廓与Logvinovich的半经验公式给出的结果相吻合。在垂直入水的情况下，调查了物体头部对空泡的起始点位置及其形态的影响。Abstract: Small-angle oblique and vertical water entry experiments were carried out to observe the supercavitation generated by the blunt bodies with different initial velocities. The development features of the supercavitation in different cases were analyzed. Experimental results show that for small-angle oblique and vertical water entry, the the round-head and flat-head (disc cavitator) blunt bodies can form stable trajectories. When the initial water-entry velocity is lower, the closure mode of the cavity is deep closure. When the initial water-entry velocity is higher, the closure mode of the cavity is surface closure, and its speed decay rate is larger. For the supercavity generated by the small-angle oblique water entry of the blunt bodies, the front part of the supercavity contour is in agreement with the result by G.V. Logvinovich's semi-empirical formula. For the vertical water entry of the blunt bodies, the influences of the head shapes were discussed on the beginning points and morphologies of the supercavities.
-
Key words:
- mechanics of explosion /
- supercavity morphology /
- oblique water entry /
- blunt body /
- velocity /
- free surface
-
图 13 不同初速度下钝体入水后的位移和速度对比
Figure 13. Comparison of displacement and velocity after water entry among the blunt bodies with different initial velocities
图 15 工况3实验和Logvinovich理论确定的超空泡外形轮廓位置
Figure 15. The cavity contours by current experiment in case 3 and Logvinovich's theory
图 16 垂直冲击入水时钝体头部形状对超空泡发生位置的影响
Figure 16. The dependence of the supercavitation beginning points on the head shapse of blunt bodies in the case of vertical water entry
表 1 不同工况下的实验参数
Table 1. Experimental parameters in different cases
工况 头型 p0/MPa α/(°) m/g v0/(m·s-1) 1 平头 0.3 18 3.569 9 14.64 2 圆头 0.3 18 3.445 8 9.58 3 圆台头 0.2 18 2.992 8 6.29 4 圆台头 0.3 18 2.992 8 12.24 5 圆台头 0.5 18 2.992 8 35.35 6 圆台头 1.0 18 2.992 8 82.76 7 尖头 0.3 18 3.305 9 14.19 8 平头 重力加速 90 18.131 3 4.425 9 圆头 重力加速 90 17.580 8 4.560 10 尖头 重力加速 90 17.050 3 4.545 
下载: 导出CSV
-
[1] 魏平, 侯健, 杨柯.超空泡射弹研究综述[J].舰船电子工程, 2008, 28(4): 13-14. http://www.cqvip.com/QK/95027A/20084/1000043670.htmlWei Ping, Hou Jian, Yang Ke. Summary of supercavitating projectile researches[J]. Ship Electronic Engineering, 2008, 28(4): 13-14. http://www.cqvip.com/QK/95027A/20084/1000043670.html [2] 施红辉, 罗喜胜.可压缩性和高速多相流动[M].合肥: 中国科学技术大学出版社, 2014: 156-247. [3] 石汉成, 蒋培, 程锦房.头部形状对水雷入水载荷及水下弹道影响的数值仿真分析[J].舰船科学技术, 2010, 32(10): 104-107. http://www.cnki.com.cn/Article/CJFDTotal-JCKX201010028.htmShi Han-cheng, Jiang Pei, Cheng Jin-fang. Research on numerical simulation of mine water-entry impact acceleration and underwater ballistic trajectory under the different mine's head shape[J]. Ship Science and Technology, 2010, 32(10): 104-107. http://www.cnki.com.cn/Article/CJFDTotal-JCKX201010028.htm [4] 丛敏.超空泡:未来水下武器系统的挑战[J].飞航导弹, 2007(12): 11-14. http://www.cnki.com.cn/Article/CJFDTotal-FHDD200712006.htm [5] 陈先富.弹丸入水空穴的试验研究[J].爆炸与冲击, 1985, 5(4): 70-73. http://www.bzycj.cn/article/id/11165Chen Xian-fu. Experimental studies on the cavitation phenomena as a pellet entering water[J]. Explosion and Shock Waves, 1985, 5(4): 70-73. http://www.bzycj.cn/article/id/11165 [6] Shi H H, Itoh M, Takami T. Optical observation of the supercavitation induced by high-speed water entry[J]. Journal of Fluids Engineering, 2000, 122(4): 806-810. doi: 10.1115/1.1310575 [7] Truscott T, Techet A, Beal D. Shallow angle water entry of ballistic projectiles[C]∥CAV2009: The 7th International Symposium on Cavitation. Michigan, USA: Ann Arbor, 2009: 1-14. [8] Logvinovich G V.自由边界流动的水动力学[M].施红辉, 译.上海: 上海交通大学出版社, 2012: 97-111. [9] 周素云, 施红辉, 胡青青, 等.水平超空泡发生装置的研制及相关实验研究[J].浙江理工大学学报, 2013, 30(2): 218-223. http://d.wanfangdata.com.cn/periodical/zjgcxyxb201302018Zhou Su-yun, Shi Hong-hui, Hu Qing-qing, et al. Development of horizontal supercavity generating facility and relevant experimental study[J]. Journal of Zhejiang Sci-Tech University, 2013, 30(2): 218-223. http://d.wanfangdata.com.cn/periodical/zjgcxyxb201302018 [10] 胡青青.不同倾角下钝体入水后的超空泡流动的实验观察及数值计算[D].杭州: 浙江理工大学, 2014: 75-82. [11] 施红辉.周素云, 胡俊辉, 等.水平超空泡与自由面相互作用的实验装置: 中国, ZL201210155061.6[P]. 2014-04-16. [12] 顾建农, 张志宏, 郑学龄.弹体入水弹道研究综述[J].海军工程大学学报, 2000, 12(1): 18-23. http://www.cqvip.com/Main/Detail.aspx?id=12541534Gu Jian-nong, Zhang Zhi-hong, Zheng Xue-ling. A review of the body's water entry ballistics research[J]. Journal of Naval University of Engineering, 2000, 12(1): 18-23. http://www.cqvip.com/Main/Detail.aspx?id=12541534 [13] 何春涛, 王聪, 何乾坤, 等.圆柱体低速入水空泡试验研究[J].物理学报, 2012, 61(13): 134701. http://www.cnki.com.cn/Article/CJFDTotal-WLXB201213043.htmHe Chun-tao, Wang Cong, He Qian-kun, et al. Low speed water-entry of cylindrical projectile[J]. Acta Physica Sinica, 2012, 61(13): 134701. http://www.cnki.com.cn/Article/CJFDTotal-WLXB201213043.htm [14] 王献孚.空化泡和超空化泡流动理论及应用[M].北京: 国防工业出版社, 2009: 1-56. -
点击查看大图
图(16) / 表(1)
计量
- 文章访问数: 2888
- HTML全文浏览量: 426
- PDF下载量: 357
- 被引次数: 0