Abstract
In this study, the flow field and impeller structure response in the mixed-flow pump are cooperative solved based on the bidirectional synchronization solving method, to study the vibration characteristics of the mixed-flow pump impeller rotor under the fluid-structure interaction. The pressure distributions of blade surface in the mixed-flow pump under different flow rate conditions were compared, and the deformation, equivalent stress distribution and natural vibration frequency of impeller blade under static force load were studied. Meanwhile, the deformation of impeller blade and coupling stress distribution was analyzed based on bidirectional fluid-structure interaction. The results show that the deformation of impeller blade increases from hub to rim, and the maximum deformation occurs at the rim of the blade. The stress distribution of impeller blade in the circumferential direction is symmetrical, and the maximum equivalent stress occurs at the blade outlet edge near the hub. The maximum deformation position and the stress concentration location are basically consistent before and after coupling calculation, but the maximum deformation value increases and the maximum equivalent stress value decreases under the fluid-structure interaction. The influence of water pressure on the strength and frequency of vibration is very limited. With the increase of flow rate, the maximum equivalent stress of impeller decreases and the total deformation increases gradually. The results of this research provide reference basis for the structure design and reliability analysis of the mixed-flow pump.
Highlights
Mixed-flow pump is widely used in agricultural irrigation, urban water supply and drainage, mine, large-scale water conservancy projects, ships hydraulic propulsion, the sea water desalination system, circulating water system of thermal power and nuclear power plant, and etc. [1,2,3]
The flow field and structure field of the mixed-flow pump impeller are cooperative solved based on the bidirectional alternate fluid-structure interaction method, and the stress and the deformation of the impeller blades, as well as the coupled vibration characteristics of the mixed-flow pump impeller under various working conditions are analyzed
The pressure load information on the impeller blade surface is accurately obtained by solving the model, which provides guarantee for the impeller finite element analysis
Summary
Mixed-flow pump is widely used in agricultural irrigation, urban water supply and drainage, mine, large-scale water conservancy projects, ships hydraulic propulsion, the sea water desalination system, circulating water system of thermal power and nuclear power plant, and etc. [1,2,3]. The flow field and structure field of the mixed-flow pump impeller are cooperative solved based on the bidirectional alternate fluid-structure interaction method, and the stress and the deformation of the impeller blades, as well as the coupled vibration characteristics of the mixed-flow pump impeller under various working conditions are analyzed. It provides theoretical reference for optimization design and steady operation of mixed-flow pump
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