环形水槽最佳转速比研究

摘要

Annular flume,which has been used for simulating flow structure,especially the start and settle⁃ment of fine sediments,has been widely used. There is strong secondary flow in annular flume,which cannot be eliminated but could be weakened by adjusting the ratio between the speed of the ring and the flume. By comparing the speed of the physical model and the numerical model,the numerical model of annular flume was built. For the specific annular flume,keeping the water depth,changing the speed of the ring and the flume,conclusions have been achieved that traditional method of best ratio for annular flume is not appropriate,and different best ratio should be selected for different purpose.%环形水槽常用于模拟一般河流的水流结构，来研究细颗粒泥沙的起动、沉降等问题，长期以来得到广泛使用。但环形水槽内部存在强烈的不可消除的二次流，通常情况下，可以通过调节剪切环和水槽的转速比来减弱环形水槽二次流。文章通过对比环形水槽实体环形水槽实测流速和数值环形水槽计算的结果，建立环形水槽数值环形水槽。在既定的环形水槽和试验水深条件下，通过改变上下盘的转速研究了环形水槽的最佳转速比，文章认为传统的实体环形水槽率定最佳转速比的方法存在一定不合理性以及不同的实验目的应设定不同的最佳转速比。