上游串联双调压室系统合理尺寸选择的研究

为了研究上游串联双调压室系统(主调压室为阻抗式,副调压室为简单式)合理的主、副调压室尺寸,结合长引水隧洞水电站工程实例,采用水锤计算的特征线法,运用过渡过程软件建立模型,对压力引水系统过渡过程进行计算研究。分析了主、副调压室不同直径组合下的调压室最高涌浪水位、波动衰减率和蜗壳末端最大水锤压力的变化规律。研究表明:对于布置双调压室系统,随着副调压室直径增大,主调压室阻抗孔对水锤压力的影响减弱;阻抗孔直径有一个临界值点,低于该点,副调压室最高涌浪水位随阻抗孔直径的增加而降低,高于该点,则上升;若副调压室直径过大,则主、副调压室水位波动衰减较慢。研究结论对类似工程合理地选择主、副调压室直径有一定参考作用。

Research on the reasonable size selection of upstream series double surge chambers for hydropower station

In order to study the reasonable size of the main and auxiliary surge chambers in the upstream series double surge chambers system ( the main surge chamber is impedance type and the auxiliary surge chamber is simple type ), the characteristic line method and the transition process software were used to calculate and study the transition process of the pressure water diversion system. The variation law of maximum surge water level, fluctuation attenuation rate and maximum water hammer pressure at the end of volute in different size combinations of main and auxiliary surge chambers were analyzed. The results showed that the influence of the impedance hole of the main surge chamber on the water hammer pressure decreased with the increase of the size of the auxiliary surge chamber when the double surge chambers system was arranged. The size of the impedance hole had a critical point below which the maximum surge water level of the auxiliary surge chamber decreases with the increase of the size of the impedance hole and rises above this point. The size of auxiliary surge chamber was too large and the fluctuation attenuation of double surge chambers was slow. The results are useful for similar projects to select reasonable sizes of the main and auxiliary surge chambers.