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分层流中附体对潜航体尾迹频谱特性影响研究
Influence of appendages on spectrum characteristics of submarine wake in stratified flow
胡开业, 杨哲超, 于祥, 丁勇
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作者单位:哈尔滨工程大学 船舶工程学院,黑龙江 哈尔滨 150001
中文关键字:分层流;SAR;频谱分析;海表尾迹
英文关键字:stratified flow; SAR; spectrum analysis; sea surface wake
中文摘要:海洋流场密度因温度和盐度的不均匀变化具有垂向分层现象,合成孔径雷达(SAR)检测潜航体在分层流中运动的海表特征呈现较大差异的功率谱特性。基于海洋遥感中的频谱分析方法,利用CFD仿真技术手段,模拟不同潜航体模型在分层流中的运动情况,运用快速傅里叶变化进一步处理二维波高信号,深入探究了潜航体的附体对流场内界面和自由表面的影响。研究表明:基于频谱分析法的尾迹特性研究能有效揭示不同频率成分对界面粗糙度的影响,能够有效定义和区分潜航体附体造成自由表面辐聚辐散效应的差异;在航速、潜深和分层模式等相同时,尾舵对尾流场具有一定的优化效果,指挥台围壳是影响海表尾迹的主要因素。
英文摘要:Due to the inhomogeneous variation of temperature and salinity, the density of ocean flow field has vertical stratification phenomenon, and the sea surface characteristics detected by synthetic aperture radar (SAR) in stratified flow show great difference in power spectrum characteristics. Based on the spectrum analysis method of ocean remote sensing, the motion of different submarine models in stratified flow is simulated by using CFD simulation technology. The two-dimensional wave height signal is further processed by using fast Fourier transform, and the influence of submarine appendage on the flow field interface and free surface is deeply explored. The results show that: the wake characteristics research based on spectrum analysis method can effectively reveal the influence of different frequency components on the interface roughness, and can effectively define and distinguish the difference of free surface convergence and divergence effect caused by submarine appendages; when the speed, depth and stratification mode are the same, the rudder has a certain optimization effect on the wake field, and the command platform enclosure is the main factor affecting the surface wake Key factors.
2021,43(9): 19-24 收稿日期:2020-10-16
DOI:10.3404/j.issn.1672-7649.2021.09.004
分类号:U662.2
基金项目:装备预研基金资助项目(6141B06274),国家自然科学基金资助项目(51779053)
作者简介:胡开业(1980-),男,博士,副教授,研究方向为舰船总体性能
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