关键词: 减压阀直径, 关闭时间, 调压室涌浪, 蜗壳末端压力

Abstract:

On the basis of the state space method of rigid water hammer and Methodot characteristics (MOC) of elastic water hammer, the impact of pressure reducing valve under joint protection of pressure reducing valve and air cushioned surge chamber on the air cushioned surge chamber and parameters of units is simulated. Taking a hydropower station in operation as an example, the parameters of different pressure reducing valve of the water transfer system are optimized and the principle for selecting the diameter of the pressure reducing valve is summarized, which can not be too large or too small, on the basis of the analysis and study of the optimization results. The optimal diameter should guarantee that the maximum pressure at the end of the volute casing when the stators are closing should be equal to the maximum upstream pressure generated when the pressure reducing valve is closing. The practice showed that the closing time of the valves can not be too long and should reduce the pressure as well, so as to avoid the waste of water resources.

Key words: diameter of the pressure reducing valve, closing time, surge chamber, the end of the volute casing