摘要
为探究潜艇长径比对海表尾迹特征的影响,构建与实艇尺寸相当且长径比各不相同的主艇体模型,采用计算流体力学(CFD)方法模拟其近水面匀速潜行时产生的兴波尾迹,并对时域空间尾迹信号进行二维快速傅里叶变换(2D-FFT),获取尾迹信号的功率谱密度(PSD)分布图.同时考虑实际海水密度稳定层化背景,结合分层流内波的模态分析理论,有效分离海表尾迹的内波成分.研究表明:当近水面航行时,分层效应影响较小,产生的尾迹波谱密度值约占海表尾迹波系的1%,而尾迹波系的首、尾横波能否发生有利干扰相较于艇体排水量的差异对自由面兴波尾迹的时域和频域特征影响更大;当首尾兴波均发生有利干扰时,长径比较小的艇型海表尾迹的高频波成分占比相对较小,在排水量增大的同时,仍具有较好的尾迹隐身性能.
To investigate the effect of submarine aspect ratios on sea-surface wake characteristics,the real size hull models with different aspect ratios were constructed,the computational fluid dynamics(CFD)methods were used to simulate its wave-making wake at a uniform speed in two layers of fluids,and the two-dimensional fast Fourier transform(2D-FFT)was used in the time domain to obtain the power spectral density(PSD)distribution of the wake signal.Research results show that the stratification effect is less affected when one sails near the surface,and the resulting wake spectral density value accounts for about 1%of the sea surface wake system,and whether the bow and stern transverse waves occur favorable interference or not has a greater impact on free-surface wake characteristics of both spatial domain and frequency domain than the difference in the displacement of the hull.When favorable interference occurs at both the bow and stern transverse waves,the hull with smaller aspect ratio has a relatively smaller proportion of high-frequency wave components in the sea surface wake,which provides a better wake stealth performance with a larger displacement.
作者
杨哲超
陈科
蓝林欣
尤云祥
YANG Zhechao;CHEN Ke;LAN Linxin;YOU Yunxiang(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,Hainan China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第4期8-15,共8页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
海南省自然科学基金资助项目(520MS071)。
关键词
海表尾迹
长径比
计算流体力学
分层效应
功率谱密度
sea surface wake
aspect ratio
computational fluid dynamics
stratification effect
power spectral density
