Volume 25, Issue 4 (2021)
J Water Soil Sci. 2021, 25(4): 187-203 |
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Elahifar H, Tayari O, Yazdanpanah N, momeni M. Experimental Study of Discharge Coefficient of Symmetric and Asymmetric Rectangular Labyrinth Weirs. J Water Soil Sci. 2021; 25 (4) :187-203
URL: http://jstnar.iut.ac.ir/article-1-4084-en.html
URL: http://jstnar.iut.ac.ir/article-1-4084-en.html
Islamic Azad University of tehran North Branch , tayari@iauk.ac.ir
Abstract: (6404 Views)
The discharge coefficient of labyrinth weirs increases with increasing the crest length in a certain width range. The present research was carried out in a laboratory flume with a length of 8 m, a width of 0.6 m, and a height of 0.6 m. The discharge coefficient of two-cycle symmetric and asymmetric rectangular labyrinth weirs was experimentally measured. The dimensional analysis by the Buckingham π theorem indicated that the discharge coefficient was dependent on Se, B/Wavg, Ht/P, and WL/WR. According to the results, the discharge coefficient decreased with increasing the hydraulic head in the symmetric and asymmetric labyrinth weirs and the linear weir. Asymmetric labyrinth weirs with a WL/WR of 2.05 outperformed symmetric labyrinth weirs with a WL/WR of 1. Quantitatively, the discharge coefficient of the labyrinth weir with a B/Wavg of 3.1 was respectively 21% and 94% higher than that with a B/Wavg of 2.93 and 2.76. The discharge coefficient of the labyrinth weir with a WL/WR of 2.05 was 10-27% higher than that with a WL/WR of 1. The discharge coefficient of the linear weir was 60-250% higher than that of labyrinth weirs.
Keywords: Symmetric and asymmetric labyrinth weirs, Discharge coefficient, Weir cycle width ratio, Discharge capacity, Local submergence
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