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Flow deviation in the discharge passage of a slanted axial-flow pump system

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WANG Benhong ，WANG Fujun 1，2 ，XIE Lihua ，WANG Chaoyue ，SU Shengli ，ZHU Quanrong 5
（1. College of Water Resources & Civil Engineering，China Agricultural University，Beijing 100083，China；
2. Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System，Beijing 100083，China；
3. Zhejiang Design Institute of Water Conservancy and Hydro-electric Power，Hangzhou 310002，China；
4. Jiaxing South Drainage Engineering Administration of Hangjia Lake，Jiaxing 314001，China；
5. Leo Group Hunan Pump Industry Co.，Ltd.，Xiangtan 411201，China）

Abstract：Slanted axial-flow pump is a typical type of pump in the field of high flow and low lift，but it
has a serious flow deviation problem on some operating conditions. The deviation phenomenon affects the ef⁃
ficiency and instability of pumping stations. In this paper，the model of 15-degree slanted axial flow pump
in Zhejiang Yanguan pump station is taken as the research object. The transient flow characteristics in the
device are studied through model test and numerical simulation. The characteristics of internal flow under
different flow conditions and the causes of flow deviation are analyzed， and the inhibition measures to
solve the problem of flow deviation are put forward. The results show that the left flow rate of the outlet
flow pier is higher than the right flow rate in the downstream flow direction, and the flow deviation ratio
reaches 2.33 under the optimal flow condition. 70% of the flow rate flows out from the left flow channel.
The deflection of the water flow in the outlet passage is caused by the deflection of the water flow through
the bend section under the influence of residual ring volume. It can effectively improve the internal flow
state of the outlet flow passage and restrain the occurrence of the bias by setting the bias suppression mea⁃
sures in the bend section of the outlet flow passage. The research results have been applied to the proto⁃
type device of Yanguan pump station and achieved good effect， which provides good references for solving
the bias problem of large-scale slanted axial-flow pump station and ensuring the safe and stable operation
of the pump station.
Keywords：slanted axial flow pump system；discharge passage；flow deviation；inhibition measure
（责任编辑：韩 昆）

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