Influence of guide vane installation angle on structural characteristics of centrifugal pump impeller
To enchance the operation stability of a volute centrifugal pump with guide vanes,the im-pact of varying guide vane installation angles on both the performance and structural mechanical re-sponse of the centrifugal pump was studied.Taking a volute pump with guide vanes as the research ob-ject,numerical simulation of its flow field was firstly conducted.Then,employing the static and tran-sient structural analysis modules,the hydrostatic pressure load was introduced into the impeller struc-ture to achieve one-way fluid-solid coupling analysis.This analysis aimed to explore the variation pat-terns in impeller deformation and equivalent stress under different installation angles of the guide vanes.Finally,the vibration characteristics of the impeller structure were studied through modal analysis.The results show that when the installation angle of the guide vane decreases,there is a notable shift in the high-efficiency region of the pump towards lower flow rates.Moreover,it is observed that the maximum efficiency of the pump gradually increases,exhibiting a maximum improvement of 2.1％.The steady-state results obtained from one-way fluid-structure interaction are consistent with the transient results.Furthermore,both the maximum deformation of the impeller and the maximum value of equivalent stress decrease with the flow rate increases.Near the design operating point,reducing the installation angle of the guide vane results in a maximum difference of 3.3％in these values,and the change in the maximum equivalent stress is relatively small.The influence of prestress on the natural frequency of the impeller in the dry mode is negligible.The natural frequency in the wet mode has a significant decrease when compared to the dry mode.
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