中文摘要：

电站取水口复杂冲沙廊道系统的冲沙孔孔前漏斗范围往往随冲沙流量增加而增大,但相应地,冲沙孔与廊道连接过渡段的压力则迅速减小,并出现较大负压,简单的调度运行方式很难使压力特性及冲沙漏斗范围达到均佳,必须进行调度方式的优化研究才能达到两者均佳的目的。结合大渡河龙头石水电站取水口复杂冲沙廊道系统的模型试验,通过对复杂冲沙系统冲沙孔组合运行方式的优化调度研究,在不改变冲沙孔孔口尺寸及冲沙廊道系统布置方案的基础上,采用4#冲沙孔全开＋3#冲沙孔局开1/2的运行方式使孔前冲沙漏斗、输沙管道压力特性达到了均佳的目标。研究成果对类似布置的取水口冲沙系统的运行方式拟定有重要工程价值和经济效益。

英文摘要：

Complex sand-flushing system results in the disproportion of discharge through each outlet and the disparity of each funnel range.Simultaneously,hydraulic characteristics in connection part between sand-discharging outlet and the gallery is very complicated.Therefore,it is very difficult to achieve wide funnel range and good pressure characteristic by the simple operation schemes while keeping the form of sand-flushing structure.Based on hydraulic model test of sand-flushing system in the intakes of Longtoushi hydropower station in Dadu River,operation schemes were studied by physical models.The results revealed that the funnel range can be wide and pressure characteristic be good by means of changing operation scheme of the sand flushing system,which has important engineering and economic impacts for designing operation scheme of similar sand-flushing system of water intake.