泄槽底部掺气坎后水流掺气浓度分布模型试验  

Experimental study on the distribution of air concentration in flow after bottom aerator

作　　者：马关博[1] 徐一民[1] 乔梁[1] 荣岩[1] 

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500

出　　处：《水利水电科技进展》2014年第5期12-16,共5页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51069002;51269005)

摘　　要：针对泄槽底部掺气坎后的掺气浓度分布规律较为复杂、研究成果较少的问题,为了更清楚地探究泄槽底部掺气坎后上游直段、反弧段及下游直段水流掺气浓度分布规律,采用含有反弧段的泄槽进行模型试验研究。试验结果表明:上游直段、反弧段及下游直段水流中不同水深处掺气浓度的沿程变化规律是不相同的;其他条件不变时,水流掺气浓度随掺气坎高度的增加而增大,随反弧段反弧半径的减小而减小;掺气坎高度和反弧半径对掺气设施的有效保护范围有一定的影响,适当提高掺气坎的高度和反弧段的半径对增大掺气设施的有效保护长度有利。Setting an aerator on the chute contained ogee section is an important subject of cavitation erosion. The distribution of air concentration in flow after bottom aerator still a challenge task and relevant research results are quite limited. In order to explore the distribution of air concentration on straight section after aerator, ogee section, and straight section after ogee section on chute, we use the chute with ogee section to set up an experiment. By doing it so, different size of aerator with different radius of ogee section have been tested, measured rand analyzed. The overall experiment results shout that when other conditions remain unchanged, the air concentration in the flow increases with the increase of aerator＇ s height and decreases with the decrease of the anti-arc radius of the chute. According to the air concentration in the flow, the length of protective segment of the chute may vary with aerator＇ s height and the radius of anti-arc of the chute. To some extent, increasing aerator＇ s height and the anti-arc radius of the flow chute can prolong the length of protective segment.

关 键 词：泄槽 掺气坎 反弧段 高速水流 空蚀 掺气浓度 高坝 

分 类 号：TV131.34[水利工程—水力学及河流动力学]