矩形断面压力管道汇流口局部能量损失

Local energy loss at junction of pressurized pipes with rectangular cross section

采用水动力学基本理论,对矩形断面有压管道汇流口的水力特性进行分析研究,提出收缩系数及局部能量损失系数的综合表达式,并与试验结果进行了比较。研究结果表明:正确描述管道汇流口水流特性,必须考虑主管和支管的面积、流量的相对大小和交汇角的影响;局部能量损失随流量比增大而增大,随面积比增大而减小,随交汇角增大而增大。

Based on the fundamental.theory of hydrodynamics, the flow characteristics at the junction of the pressurized pipe with rectangular cross section were fully investigated, and general analytic expressions for both contraction coefficient and local energy loss were worked out. The comparison of the calculated result with the experimental data shows that the effects of the discharge ratio, area ratio, and junction angle between main pipe and branch pipe should be considered for accurate description of flow characteristics, and that the local energy loss increases with the discharge ratio and junction angle, while it inversely varies with the area ratio.