Abstract
Because that a sewage pump is used for the transportation of liquids containing solids and fibrous foreign bodies, it is necessary to prevent blockage by foreign bodies. A single blade centrifugal pump can form a large passed particle size (the minimum particle size for the flow channel in a pump); thus, it is commonly used as a sewage pump. The internal flow of the single blade centrifugal pump is very complicated. Explication of the flow is extremely important in improving efficiency and reducing the fluid force acting on the impeller. CFD analysis were performed to investigate the flow structure in casing of a closed-type single blade centrifugal pump. In addition, we investigated the relationship between flow structure and hydraulic loss. The instantaneous static pressure by experiment and CFD analysis were in good agreement. Vortices generated from three points near the start of volute winding accumulate near the end of volute winding to form two large scale vortices and lower the total pressure. Moreover, the mixing loss inside the casing is thought to be caused by vortex generated near the start of the volute winding.
