碧口电站压力引水系统非恒定流的分析与计算

Calculation and Analysis of Unsteady Flow in Pressure Diversion System for the Bikou Hydropower Station

本文对碧口水电站压力引水系统的非恒定流情况进行了分析计算,同时得出了引水系统指定断面的压力变化过程;水轮发电机组的转速变化过程;调压井的水位波动过程及相应的最大最小值.在整个计算过程中假设较少,并由计算结果与实测结果对比可知,引水系统整个边界条件的处理较合理,尤其是水轮机边界,考虑了混流式水轮机的特性及实际关闭规律,这样所得的计算结果就更符合实际情况.

The unsteady flow regime of the complex pressure diversion system for the Bikou Hydropower Station is calculated in this paper. The pressure change process for the given section of diversion system,the speed change process for the water turbine and generator, the level fluctuation process for the surge tank and their maximum and minimum values all can be obtained at the same time. There are fewer assumptions in the calculation process. By comparison of the calculation results with the measured results, it is known that it is more reasonable for the treament of boundary conditions in this paper. Especially the characteristics of reaction turbines and the real closing rules are considered. These are tallied with the actcal situation in respect of mathematic model established.