羽根出口角の異なる一枚羽根遠心ポンプの損失解析

摘要

Single-blade centrifugal pump is used as a sewage pump widely. However, hydraulic losses increase because the impeller width is large as for single-blade centrifugal pump. It is extremely complicated, besides, because the internal flow of single-blade centrifugal pump changes greatly by an impeller position and changes by the flow rate. Therefore, a quantitative prediction and the elucidation of the generation mechanism of unsteady hydraulic losses are expected to make this kind of pump high efficiency. In this study, loss analysis was performed about two kinds of single-blade centrifugal impeller with different impeller outlet angle. As a result, the effect of the impeller outlet angle which gave it to performance and hydraulic losses was clarified. Furthermore, the momentary behavior of performance and hydraulic losses was shown, and their relations with the impeller inlet and outlet flow became clear.%羽根枚数が少なく，羽根幅の大きい遠心羽根車は通rn過粒径（ポンプ内流路の最小粒径）を大きくできるのrnで，汚水・汚物の輸送に適しており，特に一枚羽根遠rn心羽根車は汚水用ポンプに広く用いられている．一枚rn羽根遠心羽根車に関して，これまでにラジアルスラスrnトやそれによって引き起こされる軸振動につrnいて調査されてきた．著者らも通過粒径を規定した設rn計法を提案し，その設計法に基づき設計した一枚羽根rn遠心羽根車の性能特性とラジアルスラストを実験とrnCFD解析により明らかにした．