摘要
在水下弹体空泡优化建模的研究中,由于弹体水下运动过程中生成的空泡形态及特性,直接影响弹体出水时的表面冲击载荷及空中弹道的稳定性,最终决定射弹打击目标的准确性。为研究弹体水下变减速运动过程中的空化现象,利用FLUENT的自然空化模型与动网格技术,对水下轴对称弹体的非定常空泡流进行模拟计算。结果显示,弹体在变减速运动过程中所形成空泡的主体尺寸变化规律与SCAV软件一致,非定常空泡的长度和最大直径均随着自然空化数的增加呈现先增后减的变化趋势;在初始速度一定情况下,质量越大的弹体运动速度衰减越慢,同一空化数下所形成空泡的尺寸越大。
The shape and characteristics of cavity generated by the projectile during the process of underwater movement will directly affect the impact load of the body surface and the stability of the subsequent ballistic trajectory in air, finally decide the accuracy of the target. To investigate the phenomenon of cavitation around the projectile with various deceleration, numerical calculation on the unsteady cavitating flow for the underwater axisymmetric bodies is implemented on the basis of the natural cavitation model and the Dynamic Mesh Technology in FLUENT, the results show that the main dimension of the cavity formed for the projectile body during the motion with variable deceleration exhibit an identical laws of variation with the SCAV software, that is both the length and the maximum diameter of unsteady cavity increasing firstly and decreasing afterwards with the increasing of the natural cavitation number. In the case of a fixed initial velocity of motion, the projectile with greater mass presents relatively slower reduction in the magnitude of velocity and larger in size of cavity formed under the same cavitation number.
出处
《计算机仿真》
CSCD
北大核心
2015年第4期34-38,共5页
Computer Simulation
基金
三峡大学人才科研启动基金(KJ2012B039)
关键词
多相流
非定常空泡
水下弹体
变速
数值仿真
Muhiphase flow
Unsteady cavity
Underwater projectile
Variable speed
Numerical simulation
