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Experimental study on the influence of matching relationship between impeller
and guide vane on the hydraulic characteristic of a vertical centrifugal pump

1
1
ZENG Yongshun ，ZHANG Shijie ，TAO Ran 1，2 ，YAO Zhifeng 1，2 ，XIAO Ruofu 1，2 ，LIU Weichao 3
（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. Dongfang Electric Machinery Co.，Ltd，Deyang 618000，China）

Abstract： Large-scale vertical centrifugal pumps with guide vanes have been widely used in high-head
and long-distance water supply. The high pressure fluctuation in vaneless region induced by the interfer⁃
ence between the rotating impeller and the static guide vanes is a key factor that affecting the stable opera⁃
tion of the vertical centrifugal pumps. To study the influence of the matching relationship between the impel⁃
ler and the guide vane on the hydraulic characteristic of a pump，the comparison experiments on the ener⁃
gy characteristics and pressure fluctuations of three model pumps were carried out. The pressure fluctuations
in the inlet channel，the vaneless region and the volute casing were monitored，respectively，and time-do⁃
main and frequency-domain analyses were carried out. The results show that the peak-to-peak pressure fluc⁃
tuation is reduced when the flow rate is close to the design flow rate. At design flow rate， the
peak-to-peak pressure fluctuation in the vaneless region is 3.7 and 1.9 times of those in the inlet channel
and volute casing， respectively. Due to the increase in the outlet angle of the impeller blade， the optimal
working condition shifts to a larger flow rate， and the high efficiency zone is widened， but the pressure
fluctuation amplitude in the vaneless region is increased. If the inlet angle of the guide vane is reduced，
the optimal working condition shifts to a smaller flow rate， the high efficiency zone is also widened， and
the pressure fluctuation amplitude in the vaneless region is significantly reduced. The energy characteristics
can be improved by improving the matching relationship between the outlet angle of the impeller and the in⁃
let angle of the guide vane，but the pressure fluctuation is only reduced when the inlet angle of the guide
vane is reduced. This research can provide guidance for the hydraulic design of vertical centrifugal pumps
with guide vanes.
Keywords：vertical centrifugal pump；impeller blade；guide vane；inlet angle；pressure fluctuation
（责任编辑：韩 昆）
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