Abstract
This paper presents the matching characteristics of impellers and guide vanes of high capacity and pressure seawater desalination pumps by using computational fluid dynamics (CFD). The single-stage pump is numerically calculated, and its external characteristics are consistent with the test results of model pump. Taking this scheme as a prototype, the research is carried out from three aspects: (i) the impeller blade outlet width; (ii) the number of impeller and guide vane blades; and (iii) the area ratio of impeller outlet to guide vane inlet. The results indicate that the blade outlet width significantly affects the pump head and efficiency. Appropriately increasing the number of guide vane blades or changing the number of impeller blades can improve efficiency and expand the high-efficiency area. Additionally, increasing the throat area of the guide vane has the opposite effect on the large flow and small flow area of the pump. An optimized hydraulic model design scheme is obtained.
Highlights
The centrifugal pump is used in high capacity and pressure seawater desalination engineering, with a complicated internal flow
The turbulence model adopts the standard k-ε model, which is widely used in centrifugal pump simulation, and its numerical results are in good agreement with the experimental results [28,29,30]
The pump, thisbstudy will start fromparameter the matching of impeller and guide vane flow field The most direct influence change of blade outlet width on the liquid flow shape is and analyzeofitsthe influencing factors
Summary
The centrifugal pump is used in high capacity and pressure seawater desalination engineering, with a complicated internal flow. Qi et al [22] used large-eddy simulation (LES) to study the impact of different blade numbers in impellers and volutes matching on pump efficiency They found that excessive blades increase the work performed by blade surface friction, resulting in reduced pump head and efficiency. In this study, based on the excellent hydraulic model of seawater desalination highattention to the single hydraulic performance of impeller guide vane,ofbut there is a pressure pump, the matching characteristics of the impeller andand guide vane a large lack of in-depth research on their are matching relationship. Seawater desalination high-pressure pump discussed regarding three aspects: differthis study, based the on the excellent of seawater highent outlet width ofInimpeller blade, number ofhydraulic impellermodel and guide vanedesalination blades, and pressure pump, the matching characteristics of the impeller and guide vane of a large area ratio of impeller outlet to guide vane inlet.
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