不同水深对水下斜切式喷管燃气射流影响分析  

Influence of Different Water Depths on Gas Jet of Underwater Scarfed Nozzle

作　　者：齐梓宇 李昊锟 张益敢 刘华坪 叶永晧 QI Ziyu;LI Haokun;ZHANG Yigan;LIU Huaping;YE Yonghao(School of Aerospace Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学航空航天学院,湖北武汉430074

出　　处：《水下无人系统学报》2024年第3期542-551,共10页Journal of Unmanned Undersea Systems

基　　金：国家自然科学基金面上项目(52276030).

摘　　要：通过斜切式喷管喷气进行推力矢量控制,可以实现对航行器的姿态控制和轨迹调整,提高其机动性能和稳定性。为探究斜切喷管在水下的工作状态,基于雷诺时均Navier-Stokes方法和流体体积函数模型,对不同水深条件下的斜切式喷管燃气射流的流场特性及推力特性开展仿真研究,分析了燃气射流与水介质的相互作用过程以及喷管推力特性的变化。研究表明:燃气泡经过4个阶段的发展之后,形成顶部的气囊及喷口近场的锥形气体通道,气囊边缘在剪切涡作用下脱离形成气团;喷口波系的形态和位置随水深而变化,射流边界受限于燃气泡边界,二者相互作用,导致射流后续演化的不稳定;射流对平板壁面的影响呈非对称性,长边侧受影响域大于短边侧;同一时刻,水深越大,喷管推力数值越小,推力方向波动越剧烈。研究结论可为推进水下推力矢量喷管的应用提供参考。Thrust vector control by scarfed nozzle jet can realize attitude control and trajectory adjustment of the undersea vehicle and improve the maneuvering performance and stability of the undersea vehicle.In order to investigate the working state of the underwater scarfed nozzle,the Reynolds time-averaged Navier-Stokes(RANS)method and the volume of fluid(VOF)model were used,and simulation of the flow field characteristics and thrust characteristics of the gas jet of the scarfed nozzle under different water depth conditions was carried out.The interaction between the gas jet and the water,as well as the change in the thrust characteristics of the nozzle were analyzed.The results show that the gas bubble forms a gas pocket at the top and a conical gas channel in the near field of the nozzle after four stages of development.The edges of the gas pocket detach under the action of the shear vortex to form a gas cluster.The shape and position of the nozzle wave system vary with the water depth,and the jet boundary is limited by the gas bubble boundary.They interact with each other,leading to the unstable evolution of the jet.The influence of the jet on the wall of the flat plate is asymmetric,with the long side being more affected than the short side.At the same moment,greater water depth indicates a smaller value of the nozzle thrust and more violent fluctuation along the thrust direction.The conclusions can provide a reference for the application of underwater thrust vector nozzles.

关 键 词：斜切式喷管 燃气射流 流场特性 推力特性 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程] U674[交通运输工程—船舶及航道工程]