明渠渠底糙率突变对紊流摩阻流速及壁面切应力影响的试验分析  

Experimental analysis on influence from sudden change of roughness of open channel bottom on friction velocity of turbulent flow and wall shear stress

作　　者：张红光[1] 路明[1] 范志高[1] 尹红霞[1] 

机构地区：[1]河北工程大学水电学院,河北邯郸056021

出　　处：《水利水电技术》2007年第1期89-92,共4页Water Resources and Hydropower Engineering

基　　金：河北省科技领军人才创新资金项目资助(06547001D-4)

摘　　要：通过激光测速仪,对壁面糙率突变时的明渠紊流进行试验,测量了糙率突变不同水深情况下明渠紊流的纵向时均流速和脉动流速。通过实测资料分析不同糙率突变和不同水深的紊流摩阻流速变化情况和水流的壁面切应力的特点。The turbulent flow in open channel is tested with laser-Doppler anemometer, in which the longitudinal time average velocity and fluctuating velocity of turbulent flow in open channel under the conditions of the sudden changes of roughnesses at different water depths are measured. Based on the measured data, the change of the friction velocity of turbulent flow and the characteristics of the wall shear stress under different sudden roughnesses and different water depths are analyzed herein.

关 键 词：糙率 紊流 摩阻流速 壁面切应力 

分 类 号：TV133[水利工程—水力学及河流动力学]