排水泵站出水管路通气试验与计算

EXPERIMENT AND CALCULATION IN TAIL-RACE TUNNEL VENTILATION OF DRAINAGE PUMP STATION

排水泵站尾水位较低,若出水管路较长则很容易发生水柱脱离,其后果十分严重。防止的方法是在有压出水管路上设置通气孔,减少压力下降。本文通过模型试验与数值计算,详尽研究了通气后出水管路内的非恒定流过程,以及这个过程随通气孔直径改变而发生变化的机理,为合理使用这一方法奠定了基础。

The tail water level of drainage pump station is lower. Provided that the tail-race tunnel is longer,the water column separation may easily happen. It is extremly serious. One way to prevent is to set up the vent on the tail-race tunnel so as to lessen the presure decline. Through experiment and numerical calculation,this paper elaborately researches into the unsteady flow process in the tail-race tunnel after ventilation and this process, folio wing the variation of vent diameter, gives rise to variation mechanism. The foundation is laid for rationally applying this method.