分层流表面潜体尾迹弱流与多重微尺度波的测量及相互作用机理研究

The submarine sonar detection technology for such conditions as long underwater distance, large spacial scale and modern stealth technology has lost its traditional advantage. It has been an important choice to develop the SAR remote-sensing detection technology for real-time monitoring underwate targets. Now it is a key task to fully realize the interaction of the wake's slow flow generated by a submerged body with the small multi-scale waves at the surface of stratified fluid and to develop the related measurement technique. In this project,firstly both measuring and analysing methods for the surface anisotropy characteristics of the wake's slow flow generated by a submerged body in the stratified fluid will be established. Further, by means of developing the dim-target detection method of multi-scale morphology on linear-array CCD scanning images and conducting the microwave remote experiments in a stratified fluid tank, the measurement technology and analysis theory for the interaction of the wake's slow flow with the small multi-scale waves at the surface of stratified fluid will be proposed. Finally, the variation characteristics of both hydrodynamics and microwave remote signals, owing to the influence of the wake's slow flow generated by a submarine on the small multi-scale waves at the ocean surface, will be discaussed and their interaction mechanism will be elucidated. Thereore, this project is of considerable significance in science for developing synthesis measurement technology of hydrodynamics and microwave remote-sensing in the stratified fluid tank, and of important value in application for supporting the development of the submarine SAR remote-sensing detection technology.

潜艇声纳探测在水下远距离、空间大范围和现代隐身技术条件下已失去传统优势，发展SAR遥感探测技术已成为实现水下目标动态监测的重要选择，分层流表面的潜体尾迹弱流与多重微尺度波的测量及相互作用机理是发展该技术的关键性科学问题。本课题拟从水面弱流和微幅波测量入手，发展分层流体中运动潜体尾迹引起表面弱流各向异性分布特征的测量与分析方法、建立基于线阵CCD扫描的多尺度形态学弱目标检测的测量技术与分析方法、以及开展分层流风波水槽中微波遥感测量的试验技术与分析方法研究，提出分层流表面潜体尾迹弱流与多重微尺度波作用的流体力学与微波遥感的测量技术与分析理论，揭示分层海洋中潜艇尾迹的表面流场对风生海面微尺度波影响的水动力学特性和微波信号的变化规律，阐明表面各向异性弱流与多重微尺度波的作用机理。本项研究对发展水槽中流体力学与微波遥感综合测试技术与分析理论有重要学术意义，对支撑潜艇SAR监测技术发展有实际应用价值。

潜艇声纳探测在水下远距离、空间大范围和现代隐身技术条件下已失去传统优势，发展SAR遥感探测技术已成为实现水下目标动态监测的重要选择，分层流表面潜体尾迹弱流与多重微尺度波的测量及相互作用机理是发展该技术的关键性科学问题。项目研究内容主要包括：分层流体中运动潜体尾迹产生的表面弱流及其各向异性特性的实验研究；分层流表面的潜体尾迹弱流与多重微尺度表面波相互作用的实验与理论研究；分层流水槽中运动潜体尾迹的微波遥感成像试验研究。. 项目针对分层流表面潜体尾迹弱流及其与多重微尺度波的相互作用与测量问题，研制了水面周期和随机造波系统以及水面微尺度波测量系统，建立了基于二维PIV重构潜体尾迹水面微尺度结构的测量方法，提出了基于线阵/面阵CCD技术测量内波及其相互作用引起水面弱流的实验技术，以及内波演化的波流场结构测量与分析方法。利用上述技术与方法，实现了大型分层流水槽水面微尺度波造波和测量，揭示了水下潜体尾迹诱导水面微尺度几何结构和流场特征；实现了分层流水槽中内波反演和内波Mach效应模拟，揭示了分层流内部波~波相互作用的水面特征变化规律、以及分层流体中内波尾迹螺旋桨效应的变化规律；探究了双偏阵多普勒天线雷达实验室水槽测量的可行性。. 与之相关研究还包括：建立了时空非定常非规则内波演化的波流场及其与细长潜体相互作用的实验测量与分析方法，提出了非定态内波概念，获得了重力塌陷内孤立波的激发源特征、稳定传播条件和大振幅波存在依据，以及内孤立波环境下细长潜体运动规律、非定态内波和斜向内波对细长潜体作用力的变化规律等。本项研究不仅对发展水面多重尺度波流相互作用理论、实验流体力学与微波遥感综合测试技术等有重要学术意义，而且对支撑潜艇SAR监测技术发展有实际应用价值。