摘要
原型观测和模型试验都表明,轴流泵和导叶式混流泵双孔出水流道两孔流量不等,存在偏流.指出流道水力损失与水流环量有关,分析偏流对流道水力损失和泵装置效率的影响,研究偏流形成机理,提出消除偏流的方法.结果表明:水泵出流环量和出水弯管二次流共同作用形成了出水流道偏流,偏流使出水流道水力损失增大,泵装置效率下降.增大后导叶出口安放角,可以消除环量和偏流,提高泵装置效率1.6～2.4个百分点.
Prototype observation and model experiment indicate that flows in two channels of the discharge passage of an axial-flow pump and a guide vane mixed-flow pump arc unequal to each other, there is flow deviation. It is pointed out that passage hydraulic loss is related to the flow circulation, the influence of flow deviation on passage hydraulic loss and pump assembly efficiency is analyzed, the forming mechanism of flow deviation is investigated, and the method of eliminating flow deviation is put forward. Results indicate that flow deviation in discharge passage is formed by co-action of pump outflow circulation and secondary flows in outflow curved pipe, hydraulic loss of discharge passage increases and pump assembly efficiency decreases because of flow deviation. Flow circulation and deviation could be eliminated by enlarging the back guide blade outlet incidence, and pump assembly efficiency could be increased by 1.6～2.4 percentage points.
出处
《水力发电学报》
EI
CSCD
北大核心
2005年第6期110-114,120,共6页
Journal of Hydroelectric Engineering
基金
国家自然科学基金项目(50179032)
江苏省水利动力工程重点实验室基金项目(KJS03086)
关键词
大型泵站
双孔出水流道
偏流
流场测定
水力损失
泵装置效率
large pump stations
two-channel discharge passage
flow deviation
flow fields determination
hydraulic loss
pump assembly efficiency
