Abstract
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 (MR) 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 (ho/P) between 0.10 and 1.0. The lowest efficiency of labyrinth weirs concerning energy dissipation occurs when the ho/P is about 0.25. For values less than 0.60 of ho/P, by increasing MR, the performance of models is decreased. For values less than 0.30 of ho/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 ho/P, the performances of labyrinth weir models are identical and are about 75%.
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