洞内水流呈明流状态的水工隧洞。无压隧洞可用于引水灌溉、城镇供水、通航、过木等，也可用于引水式水力发电。在水利枢纽中，还常用于泄洪和施工导流。人工河道、渠道上的输水隧洞也多为无压隧洞。
... 温度作用 temperature action 无压隧洞 free level tunnel 消力池 stilling pool ...
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... non-preference 无选择性 non-pressure tunnel 无压隧洞 non-primitive code 非本原码 ...
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As a water conveyance and discharging building, free flow tunnel is very commonly used in the hydraulic engineering.
无压隧洞是常见的输水和泄水建筑物,在水利工程中有着广泛的应用。
参考来源 - 无压隧洞内消能工湍流数值模拟研究The flow pattern, energy dissipation ratio and velocity field are obtained. The calculated results are in good agreement with experimental data and provide the bases for optimal design of the energy dissipation in free-flow tunnel.
数值模拟计算所得到的洞内水流流态、速度场、消能率等与模型实测数据吻合良好,为设计此种深孔无压隧洞洞内消能工的型式提供了合理的参考依据。
参考来源 - 无压隧洞内消能工湍流数值模拟研究·2,447,543篇论文数据，部分数据来源于NoteExpress
无压隧洞多采用圆拱直墙形断面。
Free-flow tunnel used more round arch straight wall form cross-section.
盘道岭隧洞是引大入秦灌溉工程总干渠上最长的无压引水隧洞。
The Pandaoling tunnel is the longest non-pressure diversion tunnel of the main channel from Datong river to water irrigation project at Qinwangchuan region.
盘道岭隧洞是甘肃引大入秦灌溉工程总干渠上最长的无压引水隧洞。
The Pandaoling tunnel is the longest non-pressure diversion tunnel of the main channel of theDatong River to Qinwangchuan region water transferring irrigation project.
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