引水隧洞进口明满流数值模拟

以雪山水库引水坝调洪演算成果和工程投资估算为依据,拟定引水隧洞断面尺寸和引水坝水位,校核水位2 449.99m时,引水隧洞出现了明满交替流流态。采用有限体积法,运用计算流体力学数值模拟软件FLUENT对不同进水口型式的引水隧洞进口段进行数值模拟。在此基础上,比较引水隧洞在明满流流态下不同进水口型式的洞内脉动压强和水流速度沿水流方向变化情况,分析得出喇叭型进水口可更好的改善过流条件,减小明满流的不利影响。

Water inlet numerical modeling of mixed free-surface pressurized flow in diversion tunnel

Based on flood routing result and construction investment estimation of Xueshan Reservoir, the facture surface size of the diversion tunnel and the front water of diversion dam were proposed. The diversion tunnel presented a kind of flow which was the first mixed free-surface pressurized flow at maximum flood lever of 2449.99m. The diversion tunnel inducer of different water inlet styles was modeled by the CFD numerical software FLUENT. By analyzing the dynamic pressure and flow velocity in the case of this water flow along the diversion tunnel, the results indicated that the bell-mouth inlet could better improve the flow condition and reduce the negative impact of mixed free-surface pressurized flow.