组合式差动调压室差动孔敏感性分析

Sensitivity analysis of differential hole in combined differential surge chamber

针对带有连接管、竖井和差动上室的组合式差动调压室,结合某长引水式电站工程实例进行仿真计算,研究差动孔流量系数组合对调压室工作性能及有压引水系统的影响。通过对调压室涌浪变化过程、机组转速升高率及蜗壳末端压力计算成果的分析,得出只有在合适的差动孔流量系数组合下,才能充分发挥上室和升管的作用,进而提高调压室的工作性能。其结论对进一步研究该组合式差动调压室水力过渡过程具有一定实际意义,对推进该型式调压室在实际工程中的应用具有积极作用。

In view of the combined differential surge chamber with the connecting pipe, the shaft and the differential upper chamber, the effects of differential hole flow coefficient combination on the performance of surge chamber and pressurized water diversion system was studied by numerical simulation according to a long diversion power station project. Through analysing the calculation results of surge change process of the surge chamber, the maximum speed increase rate of the unit and the pressure at the end of the volute, we concluded that the upper chamber and riser can fully play the role and then improve the performance of the surge chamber, only in proper differential hole flow coefficient combination. Our conclusion has practical significance to further study the hydraulic transition process of the combined differential surge chamber and a positive effect on the application of the surge chamber in practical engineering.