水下航行体模型尾部壁面脉动压力与近壁湍动速度同步测试  

Joint measurements of surface pressure fluctuations and near-wall turbulent flow at the stern of an underwater vehicle model

作　　者：田于逵[1] 王小庆[1] 谢华[1] 姚惠之[1] 

机构地区：[1]中国船舶科学研究中心水动力国防科技重点实验室,江苏无锡214082

出　　处：《江苏科技大学学报（自然科学版）》2010年第1期7-11,共5页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国防科技重点实验室基金项目(9140C220106070C22)

摘　　要：为了研究水下航行体尾部厚边界层湍流非定常特征,利用轴对称的光体模型及2个尺度不同的大附体模型,在低速风洞中进行模型尾部壁面脉动压力与近壁湍动速度同步测试,并采取相关计算、小波分析等方法作数据处理分析.结果表明:航行体尾壁面脉动压力信号主频成分相对较少,且频率较为固定,反映航行体尾厚边界层流动大尺度相干结构影响;而近壁湍动速度信号反映多种不同尺度的涡作用,且低频信号占据主要的频率成分,同时,随着离壁面距离的增加,湍动速度与壁面脉动压力最大相关系数减小.测试同时考察了不同大附体方案和雷诺数变化对航行体尾湍流特性的影响.In order to investigate the unsteadiness characteristics of the turbulent flow in the thick boundary layer region at the stern of underwater vehicle,the wall pressure fluctuations and near-wall turbulent flow were jointly measured with an axisymmetric bare body with and without big appendages in CSSRC Wind Tunnel.The experimental data were processed by means of correlation calculation and wavelet analysis.The result shows that,within the thick stern boundary layer,the fluctuated surface pressure contains relatively less and stable frequencies,which means the direct relation with large scale coherence structures.However,the near-wall turbulent flow reflects the eddy behaviors with various scales.It is characterized with the main components located in low frequency domain.The analysis of cross-correlation between the fluctuated surface pressure and near-wall turbulent flow demonstrates that the larger the distance away from the wall,the smaller the maximal correlation coefficients.The influences of different appendages and Reynolds numbers upon the characteristics of the stern turbulence are also investigated in detail.

关 键 词：壁面脉动压力 近壁湍动速度 功率谱 子波分析 

分 类 号：U674.76[交通运输工程—船舶及航道工程]