System Instability Caused by the Dynamic Behaviour of a Centrifugal Pump at Partial Operation : Fluids Engineering

概要

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The system instability of a centrifugal pump and pipe network is encountered in the high pressure systems of power plant. The frequency of the instability is limited to be very low (4HZ). Judging from the observation that this instability occurs at the pump operating point with a negative gradient of head-flow characteristics (stable characteristics) and with sufficient NPSH (Net Positive Suction Head), it is concluded that this is a new type of system instability, different from classical surging or cavitation surging. A series of experiments to solve the mechanism of this instability was carried out. The research program consisted of the measurement of the dynamic behaviour of the centrifugal pump, a confirmation test using a pipe network similar to that of the plant and the stability analysis of the system. Our result shows that the matching of the frequency of unstable pump impedance and the pipeline's resonant frequency results in this new type of system instability.
一般社団法人日本機械学会の論文