Analysis of Fluid-Structure Coupling Dynamic Characteristics of Centrifugal Pump Rotor System

Abstract

Safety and reliable operation is one of the most important research areas for centrifugal pump systems, due to the interaction of complex flow, large structural load, and vibration caused by the operation of the impeller. To analyze the internal flow and impeller deformation of the centrifugal pump, the single-stage single-suction centrifugal pump titled IS100-80-160 was selected as the research object. Under the principle of single variable, the turbulent flow and structural response of three impellers designed by different parameters were calculated by CFX and ANSYS Workbench. A numerical simulation of steady flow at different flow rates of the centrifugal pump was carried out, and its hydraulic performance is consistent with the corresponding experimental results. By comparing the deformation of the impeller rotor system, it was found that the closed impeller has the worst stability with the best hydraulic performance; the impeller with split blades has the worst stability with the best hydraulic performance. This study could enhance the understanding of impeller FSI on centrifugal pump stability and provide a reference for improving the operational stability of centrifugal pumps.

Structural Analysis and Optimization of Ultra-High-Speed Centrifugal Pump Rotor System Considering Fluid–Structure Interaction

“…From the research in the aforementioned literature, it can be observed that the effect of FSI is crucial for centrifugal pump rotor systems and it should not be neglected. Yuan et al [32] simulated impellers with different structures using a single fluid-structure coupling method and found that under the same flow rate, the maximum equivalent force value of the closed impeller was the highest, while the maximum equivalent stress value of the split impeller was the lowest. Shen et al [33] considered the fluid-structure coupling effect and analyzed pump rotors with different blade installation angles.…”

Numerical investigation on fluid-solid interaction of large-scale centrifugal pumps for pump station

“…The relation between internal flow fields and the vibration of rotor structure is analyzed. Yuan et al [2] numerically analyzed fluidstructure coupling dynamic characteristics of a centrifugal pump rotor system, and compared hydraulic and dynamic performances between closed impeller and splitter blade impeller. The results show that the closed impeller has the best stability but the worst hydraulic performance, while the splitter blade impeller has the worst stability but the best hydraulic performance.…”

Dynamic Characteristic Analysis of Centrifugal Pump Impeller Based on Fluid-Solid Coupling

“…Wu et al [21] studied the influence of blade pressure profile on the hydraulic and dynamic performance of a low specific speed centrifugal pump through experiment, and the result indicated that the unsteady pressure pulsation of a centrifugal pump can be effectively alleviated by blade PS modification. Yuan et al [22] calculated the turbulent flow and structural response of three impellers with different parameter designs by using CFX and ANSYS Workbench and found that the closed impeller had the worst stability and the best hydraulic performance, while the split impeller had the worst stability and the best hydraulic performance. According to the research of Adamkowski et al [23], Song et al [24], and Jaiswal et al [25], with the occurrence of cavitation, the flow pattern at the impeller hole of the centrifugal pump deviates from the ideal situation, and vibration will occur on the blade, resulting in noise in the pump.…”