闸墩迎水面角度对拱坝挑流影响的数值模拟研究

Numerical Simulation Study on the Influence of the Angle of the Gate′s Water-Facing Surface on the Lifting of Arch Dam

在水利工程领域中,闸墩迎水面形状主要是弧形,不同的弧形角度对拱坝的挑流水力特性影响不同。通过FLOW-3D软件模拟40°,50°,60°共3种角度的迎水面闸墩,分析同种流量下3种角度的迎水面闸墩对拱坝挑流影响的水力特性差异性变化。结果表明,闸墩引水面角度主要影响较大的是闸孔流速及下游河道平面流速极大值区域分布情况,对水舌厚度影响较小;相比之下,50°引水面闸墩的下游河道流速最大值分布区域较小,对下游河道冲刷影响较小。

In the field of hydraulic engineering,the shape of the water-facing surface of the pier is mainly curved.Different arc angles have different influences on the hydraulic characteristics of the arch dam.This paper mainly simulates 40,50,60 angles by FLOW-3D software.On the water-facing pier,the differential characteristics of the hydraulic characteristics of the three-angle water-facing piers on the arch dam pick-up flow under the same kind of flow are analyzed.The results show that the main influence of the diversion surface pier is the distribution of the gate flow velocity and the maximum flow velocity of the downstream channel,which has little effect on the thickness of the water tongue;the maximum flow velocity of the downstream channel of the 50 o diversion pier is smaller.It has less impact on downstream river scouring.