南水北调西线阿安引水隧洞水力学试验研究

南水北调西线阿安引水隧洞具有水头高、流速急、定流量、变闸门开度、水位变幅大等特点,借助于水工模型试验对输水洞在不同工况运用下的水流流态、泄流能力、压力特性及关键部位的空化特性、闸门区水流特性、消能工体型等进行了较系统的研究、分析,并对洞内消能工体型进行优化。在工作闸门区突扩跌坎处,选择合适的体型并严格控制表面不平整度,可达到防止或减小空化的目的。

Hydraulic Test Study on Access Tunnel A-AN

The access tunnel A-AN possesses the characters of high head, high velocity, constant charge, changeable strobe opening and large variation range of water level. The researches including flow form, discharge capacity, pressure properties, cavitation characteristics at some key positions, flow characteristics at the strobe as well as the configuration of the energy dissipater at different heads and configuration modification of the energy dissipater in tunnel were performed by hydraulic model tests. Choosing suitable confi guration and controlling the unevenness of the surface at the sudden enlargement drop-sill after the operating gate, this tunnel may avoid or mitigate cavitation.