オープン形一枚羽根遠心ポンプにおけるケーシング内の流れ構造に関する研究

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  • Study on Flow Structure in Casing of Open-Type Centrifugal Pump with Single Blade

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Sewage pumps used in sewage treatment facilities need to prevent the blockage of foreign matter because they transport fluid containing a large amount of various foreign matter. Because single blade centrifugal pump can form a large passing particle size in the pump, it is generally used as a sewage pump. The internal flow of the single blade centrifugal pump is very complicated. Elucidation of the internal flow is important for improving the efficiency of singleblade centrifugal pumps, but the open type has hardly been investigated. In this study, CFD analysis were performed to investigate the relationship between flow structure and hydraulic loss in casing of an open-type single blade centrifugal pump. As a result, in the open-type impeller, the vortices generated from near the volute winding start and near the tongue continued to develop up to around the blade phase angle of 120°. Therefore, it is suggested that the mixing loss increases rapidly to around 120°of the blade phase angle, and becomes larger than that of the closed-type impeller.

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