淹没出流泄洪洞通风井进气量试验研究  

Air Flux through Ventilation Shafts of Tunnel Submerged Outlets

作　　者：李盼[1] 张建民[1] 李君宁[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点试验室,成都610065

出　　处：《中国农村水利水电》2017年第1期135-138,142,共5页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(51279118)

摘　　要：泄洪洞通风井进气量涉及水头、体型和流态变化,较难准确计算。通过模型试验和理论分析的手段,对高速淹没出流的短泄洪洞中闸室通风井的进气量Q_a进行了测试研究,结果表明:当上游库区水位H和通风井面积A_a一定时,随着泄洪洞闸门相对开度e的增加,通风井的进气量Q_a表现出先增加后减小的趋势,当闸门相对开度e=0.5时,Q_a出现最大值;通风井面积Aa增加,进气量Q_a略有减小,当通风井面积A_a增大至400%时,进气量Q_a仅减小不足20%。基于水跃理论推导出适用于计算高速淹没出流短泄洪洞通风井进气量的估算公式,计算结果与试验观测结果基本吻合。成果对类似工程的优化设计具有重要意义。Air flux through ventilation facilities in a flood tunnel are sensitively determined by its Shapes and Internal flow patterns so that the air quantity is hard to calculate.An experimental model,a flood tunnel with the mid-gated chamber,is employed to measure air flux through ventilation shafts.It is found that under the given water head and vent area,air flux increases first and then decreases with the increase in the gate＇s relative opening.When the gate＇s relative opening equals 0.5,the air flux adds up to the maximum.Air flux decreases weakly following the increase in the vent area.When the vent area rises to 400%,the air flux only reduces less than 20%.Based on the theory of hydraulic jump,a formula calculating the air flux is derived and is able to be used under the condition of short flood tunnel with submerged outlets.The results agree well with the experimental data.The research can be referred to in projects.

关 键 词：高速淹没出流 泄洪洞 进气量 Fr数 

分 类 号：TV13[水利工程—水力学及河流动力学]