引水式电站异形尾水渠的水力特性研究

Study on hydraulic characteristics of special-shaped tailrace of diversion power station

本文针对有压引水隧洞末端特殊的地形条件,考虑到引水隧洞的引水兼顾发电功能,提出布置异形结构尾水渠结合调流阀共同运行的方式,以满足结构布置和功能要求。由于尾水渠的体型直接影响尾水流态及流速分布,关系到引水隧洞输水的效率及电站机组运行的稳定,因此,文中通过水工模型试验的方法,研究不同工况下,锥形阀出口高速水流掺气、通气、流速分布等水力特性问题,验证了异形尾水渠结合调流阀消能方案的可行性,为同类工程问题的解决,提供了经验依据。

According to the especial terrain condition at the end of diversion pressure tunnel, and considering the water diversion and power generation function of the diversion pressure tunnel, the paper puts forward the combined operating method of setting up the special-shaped tailrace and the regulating valves to meeting the structural arrangement and function demand. Because the structural type of tailrace directly affects the flow pattern and flow velocity distribution of tail water, the transportation efficiency of tunnel and the stable operation of power station unit could be affected. Therefore, with the help of the hydraulic model test method, the paper studies these hydraulic characteristics of high velocity flow in the exit of the cone valve under the different working conditions,the characteristics include the aeration, ventilation and flow velocity distribution, and so on. Then the feasibility of the combined operating method of tailrace and regulating valves is verified, which could provide experience for similar projects.