Abstract：To enchance the operation stability of a volute centrifugal pump with guide vanes, the impact of varying guide vane installation angles on both the performance and structural mechanical response of the centrifugal pump was studied. Taking a volute pump with guide vanes as the research object, first conduct numerical simulation of its flow field. Then, employing the static and transient structural analysis modules, the hydrostatic pressure load was introduced into the impeller structure to achieve one-way fluid-solid coupling analysis. This analysis aimed to explore the variation patterns in impeller deformation and equivalent stress under different installation angles of the guide vanes. Finally, the vibration characteristics of the impeller structure would be 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 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 value 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.
