推移质运动对水流紊动结构的影响

本文采用 CDL—86型超声多普勒流速仪对挟带推移质水流的紊流结构进行了较系统的试验研究,结果表明,清水水流挟带推移质后,床面附近的时均流速减少,流速梯度增加,水流的平均脉动加强,流速脉动的概率密度分布偏离正态。根据试验的成果,作者还探讨了紊流的内部结构。

Experiment Study of Effect of Bed load on Turbulent Structure of Flow

A CDL-86 Ultrasonic Doppler Anemometer is used to measure the turbul- ent structure of loading bed load flow systematically.Experimental results show that average velocity decreases and average velocity gradient increases near bed as the flow loads bed load.Average turbulent instensity of flow loa- ding bedload is much larger than that without bed load.The probability density distribution of fluctuating velocity of flow loading bed load deviates far formnormal distribution.On the basis of the experimental results,the turbulent structure of flow is studied.