The energy dissipation of flow over the labyrinth weirs

In this study, the energy dissipation of flow over the triangular and trapezoidal labyrinth weirs with one and two key cycles was investigated. The magnification ratios (M-R) of models were 1.57, 2.57, 3.57, and 4.57. Results declared that the labyrinth weirs can dissipate the energy of flow between 85% and 70% considering the range of the relative head (h(o)/P) between 0.10 and 1.0. The lowest efficiency of labyrinth weirs concerning energy dissipation occurs when the h(o)/P is about 0.25. For values less than 0.60 of h(o)/P, by increasing M-R, the performance of models is decreased. For values less than 0.30 of h(o)/P, the performance of the trapezoidal plan crest is about 10 percent lower than the crest with a triangular plan. For values greater than 0.30 of h(o)/P, the performances of labyrinth weir models are identical and are about 75%. (C) 2021 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University.