Design optimization of inlet conduit in slanted axial-flow pump installation by orthogonal array experiment
Huang Jianyong1, Zhang Feizhen1, Zhang Hao1, Yang Xiaoxia1, Zhang Rui2
1. Hangzhou Nanpai Engineering Construction Management Office, Hangzhou, Zhejiang 310000, China; 2. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China
Abstract：In order to improve hydraulic performance of a slanted axial-flow pump installation at low flow rate conditions, a simple flow control method J-Groove was utilized to modify inlet conduit structure. J-Groove depth, length, number of grooves and groove stagger angle were selected to be design factors, and each factor has three levels, then nine design cases were determined by using orthogonal array experiment method. The unsteady Reynolds averaged Navier-Stokes equations based on the filter-based turbulence model were solved by using Ansys CFX to obtain the efficiency and head of each pump in those cases at low flow rates.Based on the range analysis method, the computed results were analyzed to get regularities that how the performance of the pump is affected by those factors. It was shown that the pump head is affected by the geometrical factors in the following order: groove depth, length, number of grooves and stagger angle, while the efficiency by the factors in the order: depth, number of grooves, stager angle and groove length. At last, an optimal design was established by using redesign analysis and compared with the original design. The results verified the function of the J-Groove technique in suppressing unsteady flow in the impeller inlet and improving performance of a slanted axial-flow pump installation at low flow rate conditions.
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