Research of the vibration induced by cavitation in a centrifugal pump under part load condition

Cavitation and the corresponding induced vibration characteristics in a centrifugal pump under part load (0.4Qd, Qd is rated flow) conditions were investigated by combining numerical simulation experimental analysis to determine internal flow signals different cavitation conditions. Under conditions, initiated at inlet of blades close tongue. Expansion low-pressure region increases size vortex passages, which severity instability during severe cavitation. As develops, random generation rapid collapse bubbles produce unstable system. The high-frequency broadband pulsation vibrations distributed frequency band 4–10 kHz can be regarded as typical 0.4Qd. net positive suction head available incipient point determined 9 m rotor–stator interaction between impeller volute affects individual measurement points, exhibit clear shaft-frequency 0–600 Hz.