An important analysis on the aerofoil optimization for hydraulic performance improvement of pump-turbine

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Xiao, W.^1 ; Han, W.F.^1 ; Gu, Z.F.^2 ; Yang, J.^1

Technology Center, Sate Grid Xinyuan Company LTD., Beijing

100161, China^1

Hebei Zhanghewan Company, State Grid Xinyuan Company, Hebei Province

050300, China^2

关键词: Cavitation performance;    Comparison and analysis;    Energy characteristics;    Hump characteristic;    Hydraulic performance;    Power plant modeling;    Pumped storage power station;    Reversible pump-turbine;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012004/pdf
DOI  :  10.1088/1755-1315/163/1/012004

来源: IOP

【 摘 要 】

One of domestic pumped storage power station has been put into operation, installed four single capacities of 250MW single-stage mixed flow constant speed reversible pump-turbine set. After put into operation, it was found that there were an obvious "S" shaped area and hydraulic problem of large pressure pulsation in vaneless area of pump turbine, which had a great negative impact on the long-term safe and stable operation of the equipment. In order to solve this hydraulic problem, this paper is based on the actual situation of the power station, under without changing the flow passage from the volute to the draft tube condition, optimize the runner, the other components are not modified scheme A and optimize the movable guide vane and runner two flow passage parts in the same time, other parts do not make the transformation of the B scheme. Through the comparison and analysis between the A scheme, the B scheme and the existing power plant model test results, it is found that the A scheme and the B scheme have their own advantages in terms of the energy characteristics, cavitation performance, hump characteristics and other aspects of the pump-turbine, respectively. At the same time to optimize the movable guide vanes and the runner B scheme can achieve completely improve the characteristics of the S shaped region, and the unit can safely and stably connect to the grid without taking asynchronous guide vanes in the whole operating range; A and B schemes have obviously improved the pressure pulsation between the guide vanes and the runner of the turbine working conditions, while the B scheme is more prominent at this point.