Noise as indicator of cavitation and instability in centrifugal pumps = Hrup kot indikator pojava kavitacije in nestabilnosti pri radialnih turbo črpalkah
Čudina, Mirko
Instabilities of a pumping system can be caused by the onset of stall and surge, and/or by cavitation of the pump. Stall and surge occur at the flow rate below the design flow rate whereas the ...cavitation can occur within the entire operating conditions. Cavitation of a centrifugal pump is a result of insufficient pressure at the pump suction-operation with insufficient net positive suction head (NPSH) and may cause three different, undesirable, effects: drop in head-capacity curves, damage of the impeller by pitting and erosion, and vibration and noise. The emitted noise can be used to detect the pump operating conditions and type of instability. By simultaneous measurement of the NPSH value and corresponding noise level we can define the upper limit of permissible pump operation that prevent cavitation of the pump.
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