対称型および非対称型超小型渦流ポンプ用羽根車の内部流れがポンプ性能に与える影響(流体工学,流体機械)

概要

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The effect of internal flow in symmetric and asymmetric micro regenerative pump impellers on their pressure performance was studied. It was found that the shut off head of the pump with the symmetric impeller was about 2.5 times as that with the asymmetric impeller. The computation of the internal flow was performed to clarify the cause of the increase of the head. It was found that the contribution of the angular momentum supply was larger than that of shear stress for the head development for both cases. The larger head and momentum supply with the symmetric impeller were caused by larger recirculated flow rate and larger angular momentum difference between the inlet and outlet to the impeller. The larger recirculated flow rate was caused by smaller pressure gradient in the direction of recirculated flow. The decrease of the circumferential velocity in the casing was attributed to the smaller local flow rate in the casing.
社団法人日本機械学会の論文
2008-01-25