基于小波分析的一种涡结构分析方法  

An analysis method of vortex structure based on wavelet analysis

作　　者：王金勇[1] 杨京龙[1] 甘彩俊[1] 何枫[1] 许宏庆[1] 

机构地区：[1]清华大学航天航空学院,北京100084

出　　处：《空气动力学学报》2006年第4期466-470,共5页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(空天飞行器的若干重大基础问题)资助(90305014)

摘　　要：为从PIV测量的速度场中获取更多的定量信息,如涡尺度和涡结构等,本文利用bior5.5双正交小波4层分解,重构后得到各层分解速度场,并求出对应分解速度场对应的涡量场和旋转强度场来分析流场中涡的旋转强度及结构。应用这种方法分析冲击射流流场,得到了流场中大涡和小涡的分布以及携带的能量等信息。In this paper, for the purpose to get more quantified information, such as the scale of vortex, a biorthogonal wavelet function blot5.5 with 4-layer decomposition is used on the velocity field measured by PIV. The vorticity field and swirling strength field corresponding to reconstructed velocity fields in each different layer can be calculated. By the above method, the velocity field of an impinging jet was analyzed. The distributions of large and small-scale structures, as well as their kinetic energy distribution were obtained.

关 键 词：小波分析 涡量 旋转强度 射流 

分 类 号：V211.71[航空宇航科学与技术—航空宇航推进理论与工程]