Study On The Hydraulic Characteristics At The Side Inlet/outlet Of The Pumped Storage Plant

The pumped storage plant has been introduced for more than 100 years. In the past tens of years, the need of electric power and tis hump modulation to electric network augmented more and more, the pumped storage plants which can modulate the electric network and bring huge economic benefits is very important. Based on its pattern of intet or outlet, pumped storage plant can be classified to side pipe inlet/outlet and vertical pipe inlet/outlet. In china, the pumped storage plant with side pipe inlet/outle is applied more expansively than that with vertical pipe inlet/outlet.At present, the main way to study on the side inlet/outlet of pumped storage plant is physical model test. In this paper, the side inlet/outlet of Pumped Storage Plant are investigated by physical model test and numerical simulation.In the model test, it is found that under the pumped condition and powering condition, the flow is almost the same with different reservoir level; When several inlet/outlets work at the same time, they do not interfere with each other very much; The head loss coefficient and flow uneven coefficient are bigger under the powering condition than that under the pumped condition; The proportion of section area at the end of the dividing frusta is very important to flux distribution. The regulation segment is very important to the flow and its length should be long enough to regulate backflow produced at the top of the divergent segment.The result of the simulation indicated that, backflow produced at the top of the divergent segment. the horizontal divergent of flow in the divergent segment is the more important reason of the backflow, the augment of the horizontal divergent angel will result in the angment of backflow area. Smaller length of regulation segment will result in more uneven outflow; The pressure under working condition is the same as static pressure. The change of the proportion of section area at the end of the dividing frusta can make the outflow more even; The change of free surface with the reservoir level under the pumping condition is simulated and the results simulated are consistent with the experimental results.