用自相关法确定壁湍流相干结构条件采样的门限值  

Determination of the Threshold Values for Conditional Sampling in Detecting the Coherent Structures of Wall Turbulence by Using Auto Correlation Method

作　　者：姜楠[1,2] 王立坤[1,2] 李士心[1,2] 舒玮 

机构地区：[1]天津大学力学系 [2]中国科学院力学研究所非线性连续介质力学开放研究实验室

出　　处：《实验力学》1999年第2期165-169,共5页Journal of Experimental Mechanics

基　　金：国家自然科学基金;教育部高等学校博士学科点专项科研基金;国家"九五"攀登计划

摘　　要：研究了用条件采样方法检测壁湍流相干结构的门限值与壁湍流相干结构平均粹发周期检测结果之间的关系，根据用壁湍流流向脉动速度自相关函数检测壁湍流相干结构平均猝发周期的方法，提出了用自相关法确定壁湍流相干结构条件采样的门限值。The relation between the threshold value in conditional sampling scheme for detecting the coherent structures and the average burst period of the coherent structures in wall turbulence is examined experimentally. Based on the average burst period of coherent structures, which could be detected by the auto correlation function of longitudinal fluctuating velocity in wall turbulence, an auto correlation method for determining the threshold value in condition sampling scheme is presented.

关 键 词：相干结构 条件采样 湍流测量 门限值 猝发 

分 类 号：O357.54[理学—流体力学]