空気吸入時のポルテックスポンプの性能

概要

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The Performance of a vortex pump and flow patterns inside the pump casing were examined experimentally when air was admitted into the suction pipe. The pump head and efficiency were deteriorated due to the admission of air ; but the similarity law of the pump was ascertained to be held within the range of pump speeds n≧1000 rpm. From the measurements of flow velocity and local void fraction, it was found that a considerable concentration of air bubbles was observed inside the circulating region when the air ratio remained small. With an increase of the air ratio, the concentration was promoted an the local void fraction was unequally increased near the impeller exit within the circulating region, which caused a decrease in the circumferential component of flow velocity, and led to a decrease in the pump head.
一般社団法人日本機械学会の論文
1986-01-25