The Traditional equation (8) is corrected by numerical results. For square-edged orifice plate energy dissipater, the relative orifice plate thickness T/D has remarkable impacts on its energy loss coefficient ΞΎ. The CFD simulations and Model experiment for the flow through an orifice plate are carried out. The results of model experiment are consistence with the results calculated by using rectified equation in present paper. The results of the present research demonstrate that energy loss coefficient decreases with increase of the orifice plate thickness. The equation (9) for calculating energy loss coefficient of square-edged orifice plate energy dissipater considering the influence of thickness is proposed. Orifice plate discharge tunnel is axial symmetric, two dimensional numerical simulations of orifice plate discharge tunnel flow was used. In this paper, the effects of square-edged orifice plate thickness on energy loss characteristics are investigated by numerical simulation using CFD. The primary objective of this study was to investigated the effects of square-edged orifice plate thickness on energy loss characteristics. A lot of studies have shown that the hydraulic characteristics of orifice plate are mainly controlled by its contraction ratio, but the thickness of square-edged orifice plate also has many impacts on energy loss characteristics.
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