Numerical investigation of a muzzle multiphase flow field using two underwater launch methods  

作　　者：Jing-hui Zhang Yong-gang Yu Xin-wei Zhang 

机构地区：[1]School of Energy and Power Engineering,Nanjing University of Science&Technology,Nanjing,210094,China

出　　处：《Defence Technology（防务技术）》2022年第8期1454-1469,共16页Defence Technology

基　　金：This work was supported by the National Natural Science Foundation of China(No.11372139);the China Postdoctoral Science Foundation(2020M681596).

摘　　要：A two-dimensional axisymmetric model, employing a dynamic mesh and user-defined functions, is used to numerically simulate the transient multiphase flow field produced by an underwater gun. Furthermore, a visualized shooting experiment platform with a high-speed camera is built to observe the evolution process of such a multiphase flow field. The simulated phase distribution diagram is agreed well with the shadow photo of the experiment, indicating that the numerical model is reasonable. Further examinations of the multiphase flow fields by using the submerged and sealed launch methods show that use of the sealed launch can significantly improve the interior ballistic performance of an underwater gun. In the cases by using these two types of underwater launch methods, the displacement of the projectile within the range of the muzzle flow field meets the exponential law over time. Moreover, a not fully developed bottle-shaped shock wave is formed when t = 0.4 ms, but this bottle-shaped shock wave expands more rapidly for the sealed launch. In addition, the amplitude of pressure oscillation for the sealed launch is larger than that of the submerged launch, but the pressure oscillation of the sealed launch lasts shorter.

关 键 词：Underwater launch Multiphase flow Muzzle flow field Numerical simulation Mach disk 

分 类 号：TJ6[兵器科学与技术—武器系统与运用工程]