连续弯道水流紊动特性试验研究  

TURBULENCE CHARACTERISTICS IN CONSECUTIVE BENDS

作　　者：王虹[1] 王连接[1] 邵学军[1] 何建波[1] 王欣 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点试验室,北京100084 [2]甘肃省电力局,兰州730050

出　　处：《力学学报》2013年第4期525-533,共9页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(50979043;50879042);水沙科学与水利水电工程国家重点试验室基金(2010-ZY-3)资助项目~~

摘　　要：采用电磁流速仪,在接近天然河道形态的连续弯道中,对沿程断面上各点的脉动流速进行量测.根据测得的数据分析得到了紊动能谱、紊动强度、紊动切应力、紊动能、紊动参数等的全断面分布.研究结果表明水流紊动主要集中在10 Hz以下,不同环流形式与各种紊动量之间会互相影响,边壁处纵向紊动强烈、横向和垂向紊动较弱.Measurements of turbulence characteristics are crucial to the study of bend flow.This paper presents detailed measurements of instantaneous 3D velocity at various cross-sections in consecutive bends by using a three-dimensional（3D） electromagnetic current meter.Details of turbulent flow characteristics in the bend were obtained,including turbulence spectrum,turbulence intensity,turbulent shear stress,etc.It is found out that turbulence energy is mainly carried by fluctuations below 10Hz.Turbulent flow characteristics are closely related to secondary current.

关 键 词：连续弯道 紊动结构 二次流 

分 类 号：TV131.2[水利工程—水力学及河流动力学]