宽尾墩消力池非恒定流动水压强特性数值模拟

Numerical simulation of unsteady hydrodynamic pressure in the stilling basin of flaring gate pier

采用RNGk-ε紊流模型结合动网格技术对某工程Y型宽尾墩泄洪表孔弧形闸门开启过程进行了三维动态数值模拟研究。分析了闸门开启总时间、堰顶水头及下游初始尾水深对反弧及消力池压强的影响;定义了闸后水流的三种流态;分析了反弧及消力池三个区域压强特性。研究表明,闸门开启总时间越小,闸后水流滞后越明显,冲击区滞后最大压强越大;闸门开启过程中,冲击区最大压强与堰顶水头近似成线性关系;且其与调节区平均压强差随着下游尾水深度的增加而迅速减小。部分结果与试验数据吻合良好,说明数值方法是可靠的,可为水工闸门的合理运行提供借鉴。

The RNG k-ε turbulent model and dynamic mesh technology w ere applied to simulate the unsteady flow in the st illing basin of Y-shaped flaring gate pier during the process of radial gate opening. The effects of tot al gate opening time, w ater head over weir, and initial downstream wat er depth on the pressures of anti-arc and stilling basin w ere analyzed. Three different flow patterns w ere defined according to different gate opening velocit ies. The pressure characteristics of anti-arc and st illing basin were obtained. The results show ed that ( 1) if the total gate opening time is shorter, flow lagging behind the gate is more obvious and the lagged maximum pressure is higher in the impact zone; ( 2) there is a linear relationship betw een the maximum pressure and water head in the impact zone during the gate opening process; and ( 3) the difference betw een the maximum pressure in the impact zone and average pressure in t he adjusting zone decreases w ith the increasing of dow nstream w ater depth. T he simulation results agreed w ell w ith the experimental data, which suggested that t he numerical simulation method is reliable and can provide import ant reference for the reasonable operat ion of hydraulic gate.