Numerical Simulation Study of Water Retaining Weir with"Camber Type"Deflector
Water retaining weir is a water retaining and pressure retaining device.Its upstream and downstream archi-tectural forms include a pressure box culvert and a water retaining weir well in the middle.Its function is to ensure that the pressure box culvert is in a state of pressure under any circumstances,so as to avoid gas entering the pressure box cul-vert.Complex flow patterns such as vortex and divergence of high speed mainstream often occur in the weir during the operation of large flow rate.In order to restrain the vortex and compress the main flow,a"curved surface"deflector is used when the water-retaining weir passes through the flow.The type parameters of the baffle include included angle α,β and inner diameter R of the deflector.Through the numerical simulation calculation and comparison of the flow in weir chambers with/without diversion elements under different working conditions(α,β,R),it is found that the angle β is the main influencing factor of the diversion effect.By setting the diversion plate,the flow velocity at the edge of the vortex zone can be reduced by 0.06 m/s,the concentration of the main flow zone can be improved by 8.47% ,and the overflow capacity can be increased by 17.8% .It can provide ideas for improving the water conveyance capacity of typical water-re-taining weir buildings in large water conveyance projects and has important practical engineering significance.
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