Study of the Energy Dissipation over the Type-A Piano Key Weir

摘要

This study assesses the effects of geometrical variations, i.e., relative width ratio, magnification ratio, and cyclic variation, on the Piano Key Weir energy dissipation performance. In order to assess this, 12 type-A PKW models were tested by conducting an experimental investigation. The analysisincludes results from 280 tests and comprehensive findings of the fluid domain. The results demonstrated that the configuration of the PKWs has a greater influence on energy dissipation. The present study's findings show that the type-A PKW dissipates energy more efficiently than nonlinear or standard weirs. The energy loss over the PKW decreases as the magnification and relative width ratios increase, although the energy dissipation increases with key cycle numbers. Furthermore, the sensitivity analysis of the weir was examined by making steps at outlet key floors and found that the energy dissipation has been increased by 6.67 at low heads while reduced by 1.59 at higher heads. In addition, the author proposed two empirical projection equations for the optimal relative residual energy configuration downstream of the PKW. The proposed equations are the function of headwater ratio, relative width ratio, and magnification ratio. The results of this investigation are in perfect correlation with earlier studies.