遠心ポンプ低流量域動特性の関与したポンプ配管系の脈動現象

概要

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The system instability of a centrifugal pump and pipe network is encountered at a power plant. The frequency of the instability is confined to a very low level (4.0 Hz). Judging from the observation that this instability occurs at the pump operating point with negative gradient of head-flow (stable) characteristics and with sufficient NPSH, it is concluded that this is a new type of system instability, different from the classical surging or the cavitation surge of inducers. A series of experimental research to solve the mechanism of this instability is carried out. The research program consists of the measurement of the dynamic behaviour of the centrifugal pump, the confirmation test using similar pipeline 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 result in this new type of system instability.
一般社団法人日本機械学会の論文
1986-08-25