实体模型变率研究  

Study on Distortion Ratio of Physical Model

作　　者：姚仕明[1] 张玉琴[1] 李会云[1] 

机构地区：[1]长江科学院河流研究所

出　　处：《长江科学院院报》1999年第5期1-4,共4页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金委员会;中国三峡开发总公司联合资助的重大项目

摘　　要：通过系列变率模型试验研究表明，模型变态对水流与泥沙运动均有不同程度的影响：当变率不大于１０，且分流角与两汊过流横断面面积相差均不大时，模型变态对汊道的分流比影响甚微；当变率大于４、模型宽深比小于５ 时，模型变态对纵向垂线平均流速分布、弯道水流动力轴线及其河床变形影响较大，并且模型变态对泥沙冲淤相似的影响较对流场的影响更为敏感。研究还表明。By means of a series of experimental studies with different distorted models,the test results show that the distort of model has an effects with different degree on flow and sediment movement.When distortion ratio is more than 10,the angle of bifurcation and the difference of cross sectional areas of the bilateral bifurcated channels aren't large,the distortion of a model has a little effects on their diversion ratio;when the distortion ratio is over 4,the width depth ratio is less than 5,the distortion of model has great effects on the distributions of longitudial vertical average velocities,on the flow hydrodynamic axis on bend and on bed deformation.Moreover,the effect of distortion of model on the similitude of scouring and silting is more significant than that on flow field.The selection of distortion ratio is closely concerned with character of studying problems.

关 键 词：实体模型 变率 水流 泥沙 冲淤 

分 类 号：TV14[水利工程—水力学及河流动力学]