南宁抽水蓄能电站下水库导流隧洞过流能力研究

Conveyance Capacity of Diversion Tunnel in Lower Reservoir of Nanning Pumped Storage Power Station

针对陡坡导流隧洞复杂的流态,开展了过流能力研究。笔者采用闸孔泄流能力计算公式及隧洞常规计算公式对导流隧洞进行水力计算,并通过水工模型试验验证水力计算结果。结果表明:通过研究确定了导流隧洞洪水标准为全年20年一遇及全年50年一遇的相应设计水位分别为267.68 m、275.07 m;对于锐缘进口形式导流隧洞,采用闸孔泄流能力计算公式的泄流曲线与模型试验结果更为接近。该研究对类似抽水蓄能电站施工导流设计具有一定的参考意义。

The conveyance capacity of steep slope diversion tunnel is studied in response to their complex flow patterns.In this paper,the hydraulic calculation of diversion tunnel is carried out by using the calculation formula of sluice discharge capacity and the conventional calculation formula of tunnel,and the hydraulic calculation results are verified by hydraulic model test.The results show that the corresponding design water levels of the diversion tunnel flood standard are 267.68 m and 275.07 m for a 20-year return period and a 50-year return period,respectively.For the diversion tunnel with sharp edge import,the discharge curve calculated by the formula of sluice discharge capacity is closer to the model test results.The research has certain reference significance for the construction diversion design of similar pumped storage power stations.