【摘要】 水下发射技术是水下航行体领域的重要发展方向,其中出筒点火过程是航行体弹射出筒与近筒口点火两阶段的耦合过程。该过程中,高温高压燃气流与水环境耦合作用,形成复杂多相流场,同时航行体与发射筒壁面产生剧烈冲击,引发载荷动态变化,探究该过程的流动演化规律对完善水下发射理论体系具有重要意义。为探究深水环境下航行体出筒点火特性,文中采用Fluent软件,结合重叠网格技术与用户自定义函数,系统研究发射深度对该过程的影响规律。研究结果表明,发射深度显著影响航行体出筒点火过程中的燃气射流演化及推力特性:随着发射深度的增加,发射筒出口燃气泡径向扩张受到抑制,航行体离筒后筒口卷吸效应显著增强,燃气射流易发生断裂现象,且喷管涡流会导致发动机推力损失。文中研究可为水下航行体发射系统优化设计提供理论支撑。更多还原

【Abstract】 Underwater launch technology is a key development direction in the field of underwater vehicles. The ejection and ignition process is a coupled process involving two stages: ejection of the vehicle from the launch tube and ignition near the tube muzzle. During this process, the coupling effect between high-temperature and high-pressure gas flow and the water environment forms a complex multiphase flow field. Simultaneously, severe impacts occur between the vehicle and the launch tube wall, leading to dynamic load variations. Investigating the flow evolution mechanism of this process is significant for improving the theoretical system of underwater launch. To investigate the ejection and ignition characteristics of underwater vehicles in deep-water environments, this paper employed Fluent software combined with the overset grid technique and userdefined functions to systematically study the influence of launch depth on this process. The results indicate that launch depth significantly affects the evolution of the gas jet and thrust characteristics during the ejection and ignition process: With increasing launch depth, the radial expansion of the gas bubble at the tube exit is suppressed; the entrainment effect at the tube muzzle after the vehicle leaves the tube is markedly enhanced; the gas jet is more prone to breakup, and nozzle vortices lead to engine thrust loss. This paper can provide theoretical support for the optimal design of underwater vehicle launch systems.更多还原