ZHANG Xue-wei, LI Qiang, LV Meng-rou
（College of Mechatronic Engineering, North University of China, Taiyuan 030051, China）
Abstract： In order to speed underwater launch of minor-caliber weapons, a sealing device can be set in front of underwater muzzle to separate water, preventing the muzzle from water immersion. By establishing and simplifying the model of underwater weapon sealing device and unstructured mesh computing domain model based on computational fluid dynamics (CFD), dynamic mesh and user defined function (UDF), the N-S equation is solved and the numerical analysis and calculation of the complex two-phase flow inside the sealing device are carried out. The results show that the gas discharged from the sealing device is conducive to the formation of the projectile supercavity. When the projectile is launched at 5 m under water, the shock wave before and after the projectile has impact on the box body up to 100 MPa, therefore the sealing device must be strong enough. The research results have the vital significance to the design of underwater weapon sealing device and the formation of the projectile supercavitation.
Key words： two-phase flow; supercavitation; sealing device; computational fluid dynamics (CFD); dynamic mech
CLD number： TJ65; TP391.9Document code： A
Article ID： 1674-8042（2015）03-0253-05 doi： 10.3969/j.issn.1674-8042.2015.03.009
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基于动网格的水下发射装置两相流研究
张学伟， 李强， 吕梦柔
（中北大学 机电工程学院， 山西 太原 030051）
摘要:为防止水下武器发射时水流浸没身管， 提高小口径武器在水下发射的初速， 水下武器膛口前需设计密封装置。 建立水下武器密封装置模型的非结构网格计算域模型， 利用计算流体动力学（CFD）、 动网格和UDF等相关知识， 通过求解N-S方程， 对密封装置内复杂的两相流进行了数值分析计算。 仿真结果表明， 密封装置内排出的气体有利于射弹超空炮的形成； 此外， 在水下5 m发射时弹前激波和弹后激波对箱体冲击作用力峰值可达100 MPa， 因此要求密封装置要有足够的强度。
关键词:两相流； 超空泡； 密封装置； 计算流体动力学； 动网格
引用格式：ZHANG Xue-wei, LI Qiang, LV Meng-rou. Numerical simulation of two-phase flow field in underwater sealing device based on dynamic mesh. Journal of Measurement Science and Instrumentation, 2015, 6(3)： 253-257.［doi： 10.3969／j.issn.1674-8042.2015.03.009］
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