明渠渠底糙率突减对紊流流速及紊动强度影响的试验分析

A Test Analysis of Open Canal Bottom Coefficient of Roughness Anticlimax on Turbulent Velocity of Flow and Intensity of Turbulence Influence

利用激光测速仪,对壁面糙率突减时的明渠紊流进行试验,测量了糙率突减不同水深情况下明渠紊流的纵向时均流速和脉动流速。分析粗糙度突减对明渠紊流的影响,得到壁面糙率减小后明渠紊流的时均流速分布特点以及紊动强度的发展变化。

By testing open canal turbulent flow as wall surface coefficient of roughness anticlimax using laser Doppler anemometer, author has measured open canal portrait average flow velocity per hour and fluctuating velocity as various water depth coefficient of roughness anticlimax and has gained open canal turbulent distribution characteristic of average flow velocity per hour after wall surface coefficient of roughness reduction and development ＆ variety of intensity of turbulence by field data analysis roughness anticlimax on open canal turbulent flow influence.