摘要
为研究不同发射时间间隔下航行体水下连续发射尾涡干扰与弹道特性,基于Realizable k-ε湍流模型和能量方程、流体体积方法和重叠网格技术,开展数值方法和网格无关性验证,数值模拟结果与实验测试结果吻合度较好。建立航行体水下连续发射数值模拟方法,研究航行体尾流区涡结构的演变机理、次发航行体表面压力分布、弹道以及俯仰姿态演变规律。研究结果表明:航行体水下连续发射过程中在其尾流中发现了发卡涡形态的流动结构,该涡结构由涡头与两条涡腿组成,通常以多个共同组合的形式存在于航行体尾部的流场区域中;沿涡腿内侧发生喷射事件,沿涡腿外侧发生扫掠事件,同时在涡结构内部形成一定流向尺度的低速条带区域;在横流效应下,当次发航行体表面穿过尾流中涡结构中的低速条带区时,迎背流面压力分布特性得到较大的改善,增加了弹道姿态稳定性。
In order to study the wake vortex interference and trajectory characteristics of projectiles launched successively underwater at different launching time intervals,based on the Realizable k-εturbulence model and energy equation,volume of fluid(VOF)and overlapping grid technology were adopted.Firstly,verification of numerical method and validation of grid independence were presented.The numerical simulation results were in good agreement with the experimental results.Then the numerical simulation method of projectiles launched successively underwater was established.Based on these,the pressure distribution on the side facing the inflow as well as on the backside,trajectory and pitch attitude,particularly the evolution mechanism of vortex in wake flow were studied.The results showed that hairpin vortex-like flow structure was found,multiple hairpin vortex-like flow structures usually exist in a combined form in the flow field region at the tail of the vehicle.The jet event occurred along the inner side of the vortex leg,and the sweep event occurred outside the vortex leg.Meantime,along the inside of the vortex,a low-speed band with a certain streamwise scale was formed.Under the transverse-flow effect,when the surface of the secondary projectile passed through the low-speed strip region of the vortex in the wake,the pressure distribution characteristics of the flow facing side and its opposite side were greatly improved,the stability of trajectory and pitch attitude was increased.
作者
施瑶
任锦毅
高山
潘光
权晓波
SHI Yao;REN Jinyi;GAO Shan;PAN Guang;QUAN Xiaobo(School of Marine Science and Technology,Northwestern Polytechnical University,Xi'an 710072,Shaanxi,China;Key Laboratory of Unmanned Underwater Vehicle Technology of Ministry of Industry and Information Technology,Xi'an 710072,Shaanxi,China;Beijing Institute of Astronautical System Engineering,Beijing 100076,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2023年第10期3195-3203,共9页
Acta Armamentarii
基金
国家自然科学基金项目(52171324、U21B2055)
中央高校基本业务费项目(3102019JC006)。
关键词
次发航行体
水下连续发射
发卡涡包
时间间隔
横流效应
secondary projectile
successive launch underwater
hairpin vortex packet
time intervals
transverse-flow speed
