温度分层流体中潜航器激发内波试验  

Investigation on internal wave induced by an underwater vehiclein a thermally stratified fluid via experiments

作　　者：吴炎 李宇航[1,2] 陈科[1,2] 蓝林欣 WU Yan;LI Yuhang;CHEN Ke;LAN Linxin(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Yazhou Bay Institute of Deepsea Technology,Shanghai Jiao Tong University,Sanya 572000,China)

机构地区：[1]上海交通大学海洋工程国家重点试验室,上海200240 [2]上海交通大学三亚崖州湾深海科技研究院,三亚572000

出　　处：《江苏科技大学学报（自然科学版）》2022年第3期1-9,共9页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(11802176)。

摘　　要：当水下航行体在温度、密度沿垂向存在分层现象的流体环境中航行时,海水微团会因潜航体的扰动偏离其初始平衡位置并在浮力和重力的作用下往复振动进而形成内波.内波的传播会对原有的温度场产生扰动,因此可以通过对水温扰动特性展开研究来逆向分析潜航体的运动状态.现阶段关于温度变化研究大多停留于理论探讨和数值仿真阶段,缺乏模型试验进行对照,同时温度受环境影响较大,更需要从模型试验角度进行探究.基于上述因素,文中建立了一套试验系统,在试验室尺度下通过温度变化模拟海洋温度跃层环境形成并探究其温度变化情况.研究发现在存在温度分层的流体环境中,潜航体行进过程中存在一个临界速度U_(c),在航速达到U_(c)之前,潜航体产生的温度扰动效果与航速之间近似于线性正相关关系;在航速达到U_(c)后,即使继续增大航速,其产生的温度扰动效果依旧不会有明显增幅;直到航速突破极限速度U_(d)后温度扰动效果才会继续增加.为进一步模拟海洋环境及反潜隐身相关研究提供参考.When the submarine navigates in a fluid environment with vertical stratification of temperature and density,the disturbance of the submersible body will make the water masses deviate from their initial equilibrium position,and then the disturbance will form internal waves.The propagation of internal wave will disturb the original temperature field,so the motion state of the submarine can be analyzed by studying the disturbance characteristics of water temperature.At the present stage,most of the researches on temperature change remain in the stage of theoretical discussion and numerical simulation,and there is a lack of model experiments for comparison.Based on the above factors,an experimental system was established in this paper to simulate the marine thermocline environment and explore its temperature change on the laboratory scale.It is found that in the fluid environment with temperature stratification,there is a critical velocity U_(c) in the process of underwater vehicle motion.Before the speed reaches U_(c),the temperature disturbance effect produced by the underwater vehicle is approximately linearly positive correlated with the speed.When the speed reaches U_(c),the temperature disturbance effect will not increase significantly even if the speed continues to increase.The temperature disturbance effect will continue to increase until the speed exceeds the limit speed U_(d).The findings provide a basis for further simulation of marine environment and related research of anti-submarine stealth.

关 键 词：海洋温度跃层 临界速度 温度分层 温度扰动 

分 类 号：O352[理学—流体力学]