Abstract

ELAHIFAR, Hossein; TAYARI, Omid; YAZDANPANAH, Najme  and  MOMENI, Mehdi. Experimental investigation of the discharge coefficient of labyrinth weirs with asymmetric cycles. Water SA [online]. 2022, vol.48, n.3, pp.317-323. ISSN 1816-7950.  http://dx.doi.org/10.17159/wsa/2022.v48.i3.3911.

This study investigated the discharge coefficient in asymmetric rectangular labyrinth weirs. A dimensional analysis was carried out which showed that the discharge coefficient is a function of dimensionless parameters, such as the ratio of asymmetric widths of left and right cycles (w_L/w_R), the ratio of the total hydraulic head to the weir height (H_t/P), and the weir length ratio (B/w_avg). The experimental results for the discharge coefficient were found to decline as w_L/w_R increased or B/w_avg decreased. For w_L/w_R = 1.19, the ratio B/w_avg = 2.76 improves the discharge coefficient by nearly 12.7% compared to B/w_avg = 3.1. For w_L/w_R = 1.42, the ratio B/w_avg = 2.76 improves the discharge coefficient by nearly 34.2% compared to B/w_avg = 3.1. For w_L/w_R = 1.70, the ratio B/w_avg = 2.76 improves the discharge coefficient by nearly 30% compared to B/w_avg = 3.1.

Keywords : asymmetric width ratio; labyrinth weir; discharge coefficient; weir length ratio; hydraulic head.

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