The rotary gate is a recently proposed gate for application in semicircular elevated irrigation networks. In this study, the hydraulics of rotary gate submerged flow was theoretically and experimentally investigated. Two approaches for estimating the submerged flowrate were considered, namely the stage-discharge based on the superposition rule and the dimensional analysis principles. The results revealed that the gate opening angle and the submergence ratio affect the submerged discharge the most. Based on the compiled experimental data relationships for estimating the discharge in such flow conditions were presented. Statistical analysis indicated that both approaches yielded satisfactory results for discharge estimation. Also, the submerged threshold condition of the rotary gate was investigated and a relationship was proposed whose results concurred with the observed data. In addition, the gate discharge coefficient and its head loss were studied and relationships for determining the discharge coefficient and the relative head loss in submerged flow condition were proposed.

旋转闸门是最近提出的用于半圆形高架灌溉网络的闸门。在这项研究中，旋转闸门潜流的水力学进行了理论和实验研究。考虑了两种估计淹没流量的方法，即基于叠加规则和量纲分析原理的阶段放电。结果表明，闸门开启角度和淹没比对淹没排放影响最大。基于已编译的实验数据关系，用于估算此类流动条件下的流量。统计分析表明，两种方法都产生了令人满意的排放估算结果。还有，研究了旋转门的淹没阈值条件，并提出了一种关系，其结果与观察到的数据一致。此外，研究了闸门流量系数及其水头损失，并提出了确定水下流条件下流量系数和相对水头损失的关系。