遠心ポンプ羽根車の振動に関する実験的研究

概要

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Vibration of the impeller of a single stage centrifugal pump was investigated experimentally. First the impeller was excited by an exciter when the pump was at a stop to investigate its vibration in still water. Next the vibration of the impeller and the pressure fluctuation acting on the pump casing were measured when the impeller was rotating in a vaneless diffuser and in a vaned diffuser respectively. The following results were obtained. (1) Water has a great inertia effect, especially when it is closed surrounding the impeller. (2) The vibration wave is a traveling wave along the circumferential direction of the impeller when resonance of a nodal diameter mode is excited by the fluid forces induced by impeller-guide vane interaction. The resonance frequency depends on the rotating speed of the impeller and the traveling direction of the wave. (3) The high frequency components of the fluid forces induced by impeller-guide vane interaction increase with flow rate, so that resonance excited by the interaction may result in troubles at large flow rate. (4) In actual pumps, resonance of nodal diameter modes may be excited even when the resonance condition of impeller guide vane interaction is not met.
一般社団法人日本機械学会の論文
1999-01-25