矩形柱群非均匀湍尾流中的层次相似律  

HIERARCHICAL SIMILARITY IN AN INHOMOGENEOUS TURBULENT WAKE FLOW BEHIND MULTI-RECTANGULAR PILLARS

作　　者：邹正平[1] 任奎[1] 苏卫东[1] 顾志福[1] 佘振苏[1] 

机构地区：[1]北京大学力学与工程科学系

出　　处：《力学学报》2003年第5期519-523,共5页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(10225210;10032020);教育部优秀回国人员基金;北京大学校长基金

摘　　要：对绕3个矩形柱的非均匀湍尾流流场速度脉动时间序列进行了系统的测量与细致的统计分析,发现从近场到远场的每个测量点上,She-Leveque(SL)湍流层次相似律都很好地成立.应用层次相似律分析的β检验和γ检验方法对层次结构参数随下游距离的变化进行了计算,并对其物理特性进行了讨论,为系统地研究非均匀湍流中流动的统计结构打下了基础.Systematic measurement and careful statistical analysis are done for the time series of the velocity fluctuation in a turbulent wake flow formed by three rectangular pillars. It is observed that She-Leveque (SL) hierarchical similarity early postulated for isotropic turbulence also stands up for such complicated flow. However, the two parameters in SL model, β and γ, which are obtained by the so-called β-test and γ-test technique, are found to vary with the downstream distance of the wake. Some physical features for such variety are discussed. This work is a preliminary attempt for the systematic study of the statistical structures in inhomogeneous turbulence.

关 键 词：矩形柱群 非均匀湍流 尾流 层次相似律 流场速度 脉动时间序列 层次结构参数 标度律 

分 类 号：O357.5[理学—流体力学]