前坪水库导流隧洞下游消力池水力特性研究

Study on Hydraulic Characteristics of Stilling Pool Downstream of Diversion Tunnel of Qianping Reservoir

文章通过1∶90的正态物理模型试验研究分析了导流遂洞在特征工况下的泄流能力、流速、水面线等水力特性,重点研究了下游出口段消力池体型对效能效果的影响。结果表明:在两种特征工况下前坪水库导流隧洞泄流能力均满足要求;减小消力池长度对导流隧洞泄洪能力无影响,水跃状态由颤动水跃转变为稳定水跃,效能效果明显提升,并改善了下游弯道和尾水渠水流流态,减少工程投资。研究成果为工程的设计和安全运行提供可靠的理论依据。

The hydraulic characteristics of diversion tunnel,such as discharge capacity,velocity and water surface line are studied by 1:90 normal physical model test in this paper.The influence of the size of the downstream outlet stilling pool on the efficiency was studied.The results show that the discharge capacity of diversion tunnel of Qianping Reservoir meets the requirements under the two characteristic working conditions.Reducing the length of stilling pool has no effect on the discharge capacity of diversion tunnel.At the same time,the state of the hydraulic jump changes from vibrating hydraulic jump to stable hydraulic jump.The efficiency effect has been significantly improved.The downstream bend and tail channel flow pattern are improved.The project investment is also reduced.The research results provide a reliable theoretical basis for engineering design and safe operation.