Abstract
The hydraulic excitation characteristics of axial flow pump unit are studied through theoretical analysis, numerical simulation and field test in this paper. The correlation between impeller hydraulic and radial vibration displacement of impeller centroid is obtained through theoretical analysis. Through the 1-way fluid-solid-interaction (FSI) numerical simulation, the distributions of water pressure and displacement on the impeller surface are obtained, and the time-domain and frequency-domain characteristics of transient hydraulic and radial displacement are revealed. Through the field test, the external characteristics of axial flow pump unit and the time-frequency characteristics of the pressure pulsation at the measuring points beside the inlet of the impeller are obtained. The comparisons between simulation results and experimental results show that the former is accurate and reliable.
Highlights
With the construction of the whole line of the South-to-North Water Transfer Project in China and the renewal of national pumping stations, the number of large-scale axial-flow pumping stations is gradually increasing, and its safe operation has attracted attention from all aspects
The hydraulic excitation characteristics of axial flow pump unit are studied through theoretical analysis, numerical simulation and field test
It is found that the frequency of the axial displacement corresponds to the force acting on the impeller, but the amplitude and phase, which are related to the mass coefficient, damping coefficient, stiffness coefficient and frequency, are different from the displacement to the force
Summary
With the construction of the whole line of the South-to-North Water Transfer Project in China and the renewal of national pumping stations, the number of large-scale axial-flow pumping stations is gradually increasing, and its safe operation has attracted attention from all aspects. The steady and unsteady internal flow fields of large vertical axial flow pump are studied, and the mechanism of low-frequency pressure fluctuation in pump unit under stall condition is revealed (Kan et al, 2018). The numerical study of vibration characteristics reveals the time and frequency laws of fluid pressure pulsation and structural vibration at the same position in a vertical axial flow pump (Zhang et al, 2019). The research results on the vibration response of axial flow pump unit reveal the correlation between the unit vibration and internal flow field, and the analysis method is advanced, but no clear conclusions about hydraulic excitation characteristics of axial-flow pump unit have been drawn. The accuracy of the numerical simulation is verified by comparing the field test results of the pump station with the numerical simulation results
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