论文部分内容阅读
抽水蓄能电站相继甩负荷过程中两台机组的流量相互影响,尾水支管长短对尾水管进口压力的影响很大。通过理论推导结合对实际工程的数值模拟,分析了后甩机组尾水支管长短对相继甩负荷后甩机组尾水管进口最小压力的影响。结果表明,机组流量变化率大小决定尾水支管长短对自身机组尾水管进口最小压力的影响程度,与同时甩负荷相比,相继甩负荷后甩机组的尾水管进口最小压力对自身机组尾水支管长短更敏感;固定上、下游岔点位置,移动机组使其靠近下游岔点,可减小尾水支管水流惯性、增大相继甩负荷尾水管进口最小压力,该措施可代替降低机组安装高程的方法。
The pumped storage power plant has the influence on the flow of two units during the process of load rejection, the length of the tailrace branch has a great influence on the inlet pressure of the draft tube. Through the theoretical derivation and combination with the actual engineering numerical simulation, the influence of the length of the tailrace branch pipe on the minimum pressure of the draft tube tail pipe inlet after the rejection load was analyzed. The results show that the rate of change of unit flow rate determines the extent to which the length of the tailrace branch pipe affects the minimum pressure at the draft tube inlet of its own unit. Compared with the same load rejection, the minimum pressure at the draft tube inlet after rejection load unit The length of more sensitive; fixed upstream and downstream point of the shift, move the unit to move closer to the downstream point of intersection, can reduce the water flow inertia of the tailrace, increase the load rejection of the tail pipe after the minimum pressure, this measure can replace the lower unit installation elevation method.