关键词: 调压室, 设置条件判别, 调保计算, 瞬变流计算, 水流惯性时间常数, 拉拉山水电站

Abstract: According to the design code for surge chamber of hydropower stations, the setting condition of surge chamber is dependent on whether the flow inertia time constant of water diversion system is less than 2~4 seconds, and the ratio of flow inertia time constant to unit inertia time constant is also used as a reference. Nonetheless, it is difficult to identify the necessity of surge chamber if the flow inertia time constant is between 2 and 4 seconds in practice. For Lalashan hydroelectric station with 2.3 kilometers diversion tunnel and flow inertia time constant between 2 and 4 seconds in Sichuan Province , we introduces a quantitative methodology based on transient flow calculation to identify the necessity of surge chamber. The equation of guaranteed regulation calculation and the curve of small fluctuations stability are provided in this paper. Though comparative analysis, we confirm that the small fluctuations stability of the hydropower station with surge chamber is good and conforms to designing code. The research results can provide significant reference for design of the same type of hydropower station.

Key words: setting condition of surge chamber, setting condition discrimination, guaranteed regulation calculation, transient flow calculation, flow inertia time constant, Lalashan hydroelectric station