分层流体中尾迹时间序列结构的实验研究  

Experimental study on time series structures of the wake in a linearly stratified fluid

作　　者：魏岗[1,2] 赵先奇[1] 苏晓冰[1] 尤云祥[2] 

机构地区：[1]解放军理工大学应用数学与物理系,南京211101 [2]上海交通大学海洋工程国家重点实验室,上海200030

出　　处：《中国科学（G辑）》2009年第9期1338-1347,共10页

基　　金：国家自然科学基金(批准号:10672102);武器装备预研基金(批准号:407010803;9140A14050407JW0303);解放军理工大学预研基金(批准号:20080401)资助项目

摘　　要：在大型重力式分层流水槽中,采用多点组合探头阵列的动态测量方法,通过对线性密度分层盐水中拖曳球产生的扰动密度场的时间序列分析,研究了运动物体生成内波的运动学和动力学特性,实验获得了体积效应内波向尾迹内波转变的特征结构和体积效应内波传播的三维非对称结构,由此建立了体积效应内波的预测模型.研究表明:建立以实验为依据的理论预测模型是运动源致内波研究的有效途径.This paper is devoted to both the kinematics and dynamic characteristics of the internal wave generated by a horizontally towing sphere in a gravitational-type stratified fluid tank measuring 12 m in length, 1.2 m in width and 1.0 m in depth. By means of the real-time scanning a large array of probes, the time-series analysis of the density perturbation brought about by a towing sphere in the linearly stratified saline water was achieved. The transition characteristics from a body-generated internal wave to a wake-generated internal wave is recognized, and the vertical non-symmetric 3D structure of the body-generated internal wave is shown. The experimental results agree with theoretical ones well. It is shown that establishing prediction model based on the measurement in laboratory is a practical method for studying the internal wave generated by a moving source in a stratified fluid.

关 键 词：分层流 内波 尾迹 时间序列分析 

分 类 号：O353.2[理学—流体力学]