山西省万家寨引黄工程总干线一、二级地下泵站流量自平衡

Discharge Self-balance of Grade I,II Underground Pump Stations of GM of Shanxi Wanjiazhai Yellow River Diversion Project

引黄工程首部总干线一、二级泵站从万家寨水库引水,水库水位年变幅23 m,造成四级泵站提水流量不相同,本工程采用两级泵站间压力隧洞串联布置方案,使二泵站提水流量自动平衡。这种新型布置型式在国内高扬程、大流量、长隧洞调水工程中是首次,因此需研究其稳态水力特性,为安全运行提供可靠的技术依据。

Grade I,II pump stations of general main of Wanjiazhai Yellow River Diversion Project divert water from Wanjiazhai Reservoir with annual amplitude of reservoir level of 23 m,which causes different discharge of the four grade pump stations. This project adopts series layout of pressure tunnel between two grades of pump stations to realize automatic balance of discharge.It is the first time that this type of new layout is applied in high lift,large discharge and long tunnel water diversion project in China.Therefore,steady state hydraulic feature shall be studied to provide reliable technical basis for safety operation.