Abstract
The operating characteristics of a centrifugal pump with broken impeller malfunction was studied by tests and numerical simulation. One blade was cut 1/4 as a broken impeller. The energy characteristics, vibration, internal flow, pressure fluctuation, and radial force of the pump were studied in detail. The test results show that as for the pump with broken impeller, the head decreased by 9.85% and efficiency decreased by 1.06% under 1.0 Q0. The vibration increase amplitudes at the outlet flange are the maximum. The APF (axial passing frequency) of all monitoring points increased significantly, and a new frequency – 5APF appeared, except for the inlet of the pump. It can be found that the low-speed region of blade fracture surface is more obvious than other blades through numerical simulation. The radial force of the broken impeller increased obviously and became more concentrated. Due to the broken blade, the peak-to-peak magnitude of pressure fluctuation at the tongue and pump outlet increased by 4.7% and 9.5% respectively. The research results provide some reference for the malfunction diagnosis of centrifugal pump.
Highlights
As a general-purpose rotating machinery, the centrifugal pump is the core power equipment of many transportation systems
The purpose of this paper is to provide reference for the malfunction diagnosis of centrifugal pump damaged by impeller
The quantitative analysis indicates that the peak-to-peak magnitude of pressure fluctuation at P1 increases by 4.7% due to the broken blade and it is 9.5% for pressure pulsation at P2
Summary
As a general-purpose rotating machinery, the centrifugal pump is the core power equipment of many transportation systems. In the field of malfunction diagnosis of rotating machinery, it is mainly analyzed according to the collected signal state, and further classified and identified.[6,7] Samanta[8] and Ben Salem et al.[9] used the sensing signal to realize the mechanical malfunction diagnosis of gear and induction motor respectively. Wang[10] realized the identification, classification, and detection of steam turbine malfunctions according to the vibration signals of steam turbine units. The malfunction diagnosis method of rotating machinery is used in the malfunction diagnosis of most centrifugal pumps. Shi[11] studied the typical damage mechanism and malfunction characteristics of the pump under the phenomenon of sudden drop in efficiency and pump shaft stuck.
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