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The effect of increasing the number of cycles on the performance of labyrinth side weir

机译：增加循环次数对迷宫侧堰性能的影响

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Side weir is one of the most common hydraulic structures, which is used as a deviatory structure in rivers, irrigation and drainage channels and also in urban sewage collection systems. One of the ways to improve the efficiency of the performance of the side weir is changing the geometry of the weir. The effect of deformation and cycle number increase on the hydraulics of the flow was investigated in the side weir, through conducting 360 experiments on the labyrinth weir in three cycles 2, 1 and 4 and the discharge coefficient was obtained for different modes. The results showed that cycle number increase leads to the reduction of flaws such as Eddy flows, decrease of weir input and sudden flow increase along the weir and it also reduces the projection length of the weir. The results indicated that the weirs with cycles 1 and 2 have higher C_m. Also, upon comparison with rectangular weirs, labyrinth weirs increase C_m 1.5 to 3 times and 30% in comparison with modified oblique side weirs (in all cycles).
机译：侧围堰是最常见的水力结构之一，在河流，灌溉和排水渠以及城市污水收集系统中用作偏斜结构。改善侧围堰性能效率的一种方法是改变围堰的几何形状。通过对迷宫堰进行3个循环2、1、4的360次试验，研究了侧堰上变形和循环次数增加对流水力的影响，并获得了不同模式下的排放系数。结果表明，循环次数的增加导致缺陷的减少，例如涡流，堰输入的减少以及沿堰的突然流量增加，并且还减小了堰的投影长度。结果表明，具有周期1和2的堰具有更高的C_m。而且，与矩形堰相比，迷宫堰与改进的倾斜侧堰相比（在所有循环中）将C_m增加1.5到3倍和30％。

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