自由湍射流边界层标度律的实验测量  

An Experimental Measurement for the Scaling Law in the Boundary Layer of Circular Turbulent Jet Flow

作　　者：苏锋[1] 姜楠[1] 舒玮[1] 

机构地区：[1]天津大学力学系,天津300072

出　　处：《实验力学》2003年第3期324-330,共7页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助项目(10002011)

摘　　要：用IFA300热线风速仪以低于最小低湍流时间尺度的高分辨率,精细测量了圆自由射流中同一流向断面内不同径向位置的流向速度分量,研究了不同径向位置的非均匀、非各向同性对充分发展湍流速度结构函数自相似标度律及其层次结构模型的影响.Longitudinal velocity measurements at different radial locations in the boundary layer of turbulent jet flow from circular nozzle are carried out exactly using IFA300 hot wire anemometer, where the sampling resolution is much higher than the smallest time scale of the turbulent flow. Effects of nonhomogeneity and unisotropy of the fully developed turbulent flow at different radial locations on the selfsimilarity scaling law and hierarchical structure model are analyzed by the velocity difference structure functions and kinetic energy dissipation rate structure functions.

关 键 词：自由湍流 自由射流 边界层 实验测量 非均匀各向同性 自相似标度律 层次结构模型 速度结构函数 

分 类 号：O357.54[理学—流体力学] O358[理学—力学]