泄槽反弧段掺气坎空腔回水的试验研究  

Experimental Study on the Backwater in the Aerator Cavity over the Chute with an Anti-arc Section

作　　者：储威威[1] 张涛[2] 徐一民[1] 张继肖[1] 舒蕴璟[1] 王尧[1] 

机构地区：[1]昆明理工大学电力工程学院,昆明650500 [2]云南经济管理职业学院,昆明650106

出　　处：《南水北调与水利科技》2011年第4期39-42,共4页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金(51069002);云南省自然科学基金(2009ZC015M)

摘　　要：空腔回水是制约掺气效果的一个重要因素,影响掺气空腔回水的因素众多且复杂。通过泄槽反弧段模型试验,研究了当流量、挑坎高度、挑坎坡度等因素发生变化时,反弧半径的变化对空腔回水深度的影响。试验结果表明,当其他条件不变时,随着反弧半径的增大,空腔回水深度逐渐减小;反弧半径越小,对空腔回水深度的影响越明显;对于同一挑坎高度或坡度,空腔回水深度随来流量的增加而增加;随着挑坎高度、挑坎坡度的增大,空腔回水深度也随之增大,但当挑坎坡度达到一定时,空腔回水深度将不会增大。研究成果可为优化掺气坎下游设施的设计提供参考。The backwater in an aerator cavity is an important factor that influences the flow aeration, and there are numerous and complex hydraulic factors to affect the backwater in the cavity. The impact of the radius of the arc on the backwater depth in the cavity is investigated by a series of experiments on the anti-arc model chute when the discharge, the height of aerator and the slope of aerator change. Test results show that： when the other conditions remain unchanged,with the increase of the arc radi us,the depth of the backwater in the cavity decreases gradually; In the test conditions, the smaller the arc radius is, the more obvious its effect to the depth of the backwater in the cavity is; For the same height or slope of the aerator, with the increase of the flow, the depth of the backwater in the cavity increases; when the height of aerator and the slope of aerator increase, the depth of the backwater in the cavity increases; when the slope of aerator reaches some certain value, the depth of the backwater in the cavity no longer increases with the increase of the slope of aerator. These results can provide references for optimizing aerator downstream design.

关 键 词：水力学试验 反弧半径 挑坎高度 挑坎坡度 佛氏数 空腔回水 

分 类 号：TV131.3[水利工程—水力学及河流动力学]