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2025-03-24 04:09本頁面
【正文】 servation sina400 mm wide rectangular channel with a gate opening of 60 mm. C was found to decrease with increasing relative gate opening, from for a/h 0 to for a/ namand Humphries (1982) considered the free flow characteristics upstream of a vertical gate, as an addition to previous studies. The channel used was 311mm wide, and gate openings were a25 and 50 mm. Their data refer to the up stream recirculation zone, the bottom pressure distribution, and the velocity field. Montes (1997) furnished a solution for the 2D outflow using conformal mapping, pared the coefficient of contraction with experiments, and identified deviations due to viscosity effects. The surface profiles up and downstream rom the gate section were studied, exclusively in terms of gate opening. Energy losses across a gate were related to the boundary layer development and the spatial flow features upstream from the gate. The pur pose of this paper is to clarify several points of standard gate flow, including the discharge coefficient, the ridge position, the velocity and pressure distributions, and the shock wave development that was not at all considered up till now. These results may attract and guide numerical modelers of flow. Their results and approaches have not been reviewed here. 3 Experiments The experiments were conducted in a 500 mm wide and 7 m long horizontal and rectangular channel. The width of the approach channel w as also reduced to b245 and right hand side wall and the channel bottom were coated with PVC, and the left hand side was of glass to allow for visualization. To improve the approach flow conditions, screens were inserted and surface waves were adequately reduced. The approach flow was th us without flow concentrations, smooth and always in the turbulent smooth regime. The discharge was measured with a Vnotch weir located downstream of the channel, to within $1% or $ ls1,whichever was larger. An aluminum gate 499mm wide, 600mm high and 10 mm thick wa
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