排灌机械工程学报Issue(1)：1-8,8.DOI:10.3969/j.issn.1674-8530.15.0063
水泵水轮机不同导叶开口的驼峰特性
Unstable head-flow characteristics of pump-turbine under different guide vane openings in pump mode
摘要
Abstract
In order to obtain the unstable head-flow characteristics of pump-turbines under different guide vane openings,firstly,experiments are carried out on the pump-turbine model for a pump sto-rage power plant in pump mode.It is shown that the head gets higher and its slope becomes stepper at a low flow rate;the unstable head-flow effect exhibits more obviously with decreasing guide vane ope-ning,but the flow rate range for the effect is shrunk.Further,a 3D geometrical model of the pump-turbine model is generated and a set of mesh for its fluid domain is created.The steady turbulent flows in in the pump-turbine model are simulated by using the SST k -ω,standard k -ω,RNG k -εand standard k -εturbulence models at various flow rates under 19 mm guide vane opening,showing the SST k -ωturbulence model can result in more accurate performance curves than the others against the experimental measurements.Consequently,the flows in the pump-turbine model are simulated by means of that turbulence model at 13 mm,19 mm and 25 mm guide vane openings and the head, torque and efficiency curves are obtained and compared with the experimental observations,and good agreement is demonstrated between them.Finally,the internal flow patterns in the unstable region,at part-load,best efficiency and over-load points are analysed at 19 mm guide vane opening.It is identi-fied that the unstable head-flow effect is related to flow separation and vortex occurrence in the runner and a few stay vane passages.关键词
水泵水轮机/导叶开口/驼峰特性/数值模拟/试验Key words
pump-turbine/guide vane opening/hump characteristics/numerical simulation/experiment分类
农业科技引用本文复制引用
李德友,宫汝志,王洪杰,魏显著,刘占生,覃大清..水泵水轮机不同导叶开口的驼峰特性[J].排灌机械工程学报,2016,(1):1-8,8.基金项目
“十二五”国家科技支撑计划项目 （）
