Performance improvement of an axial flow pump model
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This study aims to design a new axial-pump model to improve the efficiency of an old pump model. The new design considers key parameters such as velocity triangles, hub-to-tip ratio, and selection of hydrofoil in the preliminary design. A computational fluid dynamics analysis was adopted to investigate the performance of the pump models. The performance of the new design was compared with that of the old pump model. The experimental results of both models matched well with the numerical results. The efficiency of the new model reached 73.4%, which is 8.2% higher than the efficiency of the old model at the design point by experimental measurement. The highest loss was found in the impeller domain of both models under the design condition. Thus, the focus is on the internal flow in the impeller domain of both models. Uniform static pressure and smooth streamline distributions were revealed in the fluid passages of the new impeller model. In contrast, non-uniform static pressure distributions were indicated in the blade passages of the old impeller model. As a result, flow circulations were found in the vicinity of the impeller hub area, which caused large hydraulic losses in the impeller and outlet domains of the old model.
Abstract
This study aims to design a new axial-pump model to improve the efficiency of an old pump model. The new design considers key parameters such as velocity triangles, hub-to-tip ratio, and selection of hydrofoil in the preliminary design. A computational fluid dynamics analysis was adopted to investigate the performance of the pump models. The performance of the new design was compared with that of the old pump model. The experimental results of both models matched well with the numerical results. The efficiency of the new model reached 73.4%, which is 8.2% higher than the efficiency of the old model at the design point by experimental measurement. The highest loss was found in the impeller domain of both models under the design condition. Thus, the focus is on the internal flow in the impeller domain of both models. Uniform static pressure and smooth streamline distributions were revealed in the fluid passages of the new impeller model. In contrast, non-uniform static pressure distributions were indicated in the blade passages of the old impeller model. As a result, flow circulations were found in the vicinity of the impeller hub area, which caused large hydraulic losses in the impeller and outlet domains of the old model.
참고문헌 (12)
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