In order to study the characteristics of the pump test-bed and pump working conditions, physical simulation experiment method was used to do the experiment of a model pump used in some pump station on a vertical closed pump test-bed. The averaged pressure before the inlet and after the outlet of the pump，as well as the averaged pressure in upstream and downstream of the pump test-bed, and pump working conditions parameters were collected with gradually reducing the flow under constant rotating speed. The change characters of pump pressure before the inlet and after the outlet as well as shaft power were analyzed, and the internal changes of both the pump device model and test system during the transition to be stable were discussed. The test results show that during the transition process, the inlet pressure fluctuation of the pump is subtle and can always be in relatively stable state. The outlet pressure in the initial stage shows ascendant trend fluctuations, and the fluctuations are intensive. But after a while, tends are relatively stable. The shaft power changes are similar to the pressure fluctuations after outlet. In the initial stage, changes are obvious, but the fluctuations gradually become stable. This period of the process has continued for more than 90 s.
Yao Zhifeng,Wang Fujun,Xiao Ruofu,et al. Key issues in pressure fluctuation experiments for centrifugal pumps[J].Journal of Drainage and Irrigation Machinery Engineering,2010，28（3）：219-223.(in Chinese)
Wang Fujun,Zhang Ling,Zhang Zhimin. Analysis on pressure fluctuation of unsteady flow in axialflow pump[J].Journal of Hydraulic Engineering, 2007,38(8) :1003-1008.(in Chinese) 倪永燕,潘中永,李 红，等.出口压力波动特性在离心泵汽蚀监测中的应用[J].排灌机械,2006,24(5):40-43.
Ni Yongyan,Pan Zhongyong,Li Hong,et al. Application of characters of discharge pressure fluctuation to monitor of centrifugal pump[J].Drainage and Irrigation Machinery,2006,24(5):40-43.(in Chinese)
Cong Guohui,Wang Fujun. Numerical investigation of unsteady pressure fluctuations near volute tongue in a doublesuction centrifugal pump[J].Transactions of the Chinese Society for Agricultural Machinery,2008,39(6):60-67.(in Chinese)
Liu Houlin,Ren Yun,Tan Minggao,et al. CFD calculation and test of pressure fluctuation in doublechannel pump[J].Journal of Drainage and Irrigation Machinery Engineering,2010,28(4):277-281.(in Chinese)