无压流

介绍了圆形隧洞导流时无压流的情况下水力计算底坡的快速判别方式。

The rapid discrimination method of the base slope in the hydraulic calculation on the free flow of river diversion circular section tunnel is introduced .

无压流圆形断面收缩水深的近似计算公式

An Approximate Calculation Formula of Contracted Water Depth in Free Flow Circular Cross-section

对建立的耦合模型采用四自由度全耦合法结合有限元数值方法直接求解，对无压流中自由面的处理则采用固定网格法中的改进初流量法。

And the modified initial flow method is adopted to deal with the free surface of unconfined seepage . Finally , the above method is applied to the fractured rock bank slope of a reservoir .

水利工程中的水流由无压流过渡为有压流时，过渡连接段的结构及尺寸设计关系到整个工程的工程量与投资。

When the water state changes from non-pressure to pressure , the structure design and the size design of the transition section between the two is related to the amount and investment of the whole project .

沿宽度方向流速分布在过渡段宽度较小时较均匀；沿水深方向主流集中在无压流底板高程以上和靠近过渡段出口端一定范围以内。

When the width of the transition section is small , the velocity distribution along the width is more uniform . The main water flow along the water depth focuses on above the bottom of non-pressure flow and near the outlet of the transition section .

无压均匀流圆管水力计算新图解

New Nomogram for Hydraulic Computation of Unpressurized Uniform Flow in Circular pipe

本文较全面地分析了非稳定井流中有代表性的承压、半承压及无压井流和产生似稳定的条件。

The typic unsteady well flows and the conditions to produce the approximating steady stage were analysed .

无压瞬变流的改进断波法及其应用

Improved segment wave algorithm of unsteady flow in open channel and its application

是值得采用和推广的长陡坡无压隧洞内流消能措施。

This energy dissipation measure is worthy to put to use and promote for long free-flow tunnels with steep slop .

无前池泵站进水系统是输水工程中较为常见的形式之一，它具有自身的水流特点：进水池为无压流，而进水池上、下游的进、出水管均为有压流。

As one of common models used in water conveyance project , pump station without afront pond is with its characteristics of non-pressure flow in intaking pond , and with pressure flow in the intaking and discharging pipes of the upper and lower of the intaking pond .