Simulation on Optimizing Hydraulic Characteristics of Stilling Pool in Turning Section of Spillway
Affected by corner centrifugal force and inertial force,stilling pool at the turning section of spillway often exhibits unfavorable flow conditions characterized by uneven water depth and flow velocity distribution.To address this complex flow issue,we conducted simulations on stilling pool at the turning section of the spillway of XBT res-ervoir in Xinjiang.We designed 17 simulation schemes and selected flow pattern,water depth,average flow veloci-ty,and energy dissipation rate as evaluation indices.Results indicate that the hydraulic characteristics of the turn-ing-section stilling pool vary in different simulation schemes.To mitigate adverse hydraulic phenomena in the stilling pool,deepening the pool depth to 6.55 m,adopting a rectangular open outlet type,and equipping 9 staggered rough strips can achieve optimal flow condition.This configuration resolves the backwater problem in the middle and rear sections and eliminated overflow along the walls.Notably,the water depth at concave bank declined by 30.22％compared to the original scheme,with a marginal water level difference of only 0.02 m between the two sides.Ac-cording to calculation results of the average water depth and kinetic energy of typical section in the stilling pool,the average water depth at the outlet section decreased by 49.97％from the original scheme,while energy dissipation rate enhanced from 18.97％to 62.63％.
stilling pool in turning sectionauxiliary energy dissipatorhydraulic characteristicsenergy consump-tion ratenumerical simulationspillway
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