有压流又称为管流，是在无自由表面的固体边界内流动的水流。
... free surface flow 无压流 pressure flow 有压流 subcritical flow 缓流流速小于临界值的流动。 ...
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Mathematical models of open-channel flow-surge tank-pipe flow and cascade pumping stations are developed respectively, and the mathematical models are used to compute hydraulic transient processes of many control working conditions.
采用特征线方法分别建立了明流－调节池－有压流输水系统和梯级泵站长距离输水系统在正常运行调节过程中水力过渡过程的数学模型，并对众多运行工况进行了计算研究。
参考来源 - 长距离输水工程水力过渡过程的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
过渡段内的水流流态直接影响有压流段的运行安全与稳定。
The water state of the transition section has direct effects to operational safety and stability of pressure flow section.
对有压瞬变流系统提出整体可控性概念。
The conception of integral controllability of pressurized transient fluid systems is presented.
而这正是有压瞬变流反问题研究的强大动力和重要意义所在。
This is the strong drive to study the inverse problems of PFT.
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