1614 斜流ポンプにおけるディフューザ部逆流がポンプ性能に及ぼす影響(S33-1 ポンプ・キャビテーション,S33 流体機械の諸問題)

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This paper presents the unsteady internal flow in a mixed-flow pump with a vaned diffuser. Tested pump has a positive slope of the head-flow characteristic curve at about 80% flow rate of the best efficiency point. In order to investigate this phenomenon, CFD and dynamic PIV measurements have been performed. It is found that the strong vortex develops at the leading edge of the diffuser vane hub-side and causes a characteristic instability. The vortex rotates around the vaned diffuser and the number of stall cell is two. Based on both PIV results and CFD, it is clarified that a stall occupies in two passages (backflow area occupies in one passage and the stall core occupies another passage) of total nine passages.
2007-09-07