Fluid–structure interaction analysis of fluid pressure pulsation and structural vibration features in a vertical axial pump

Abstract

Current studies on the operation of the axial pump mainly focus on hydraulic performances, while the coupled interaction between the fluid and structure attracts little attention. This study aims to provide numerical investigation into the vibration features in a vertical axial pump based on two-way iterative fluid–structure interaction method. Three-dimensional coupling model was established with high-quality structured grids of ADINA software. Turbulent flow features were studied under design condition, using shear–stress transport k-ω turbulence model and sliding mesh approach. Typical measure points along and perpendicular to flow direction in fluid domain were selected to analyze pressure pulsation features of the impeller and fixed guide vane. By contrast, vibration features of equivalent stress in corresponding structural positions were investigated and compared based on fluid–structure interaction method. In order to explore fluid–structure interaction vibration mechanism, distribution of main frequencies and amplitudes of the measure points was presented based on the Fast Fourier Transformation method. The results reveal the time and frequency law of fluid pressure pulsation and structural vibration at the same position in the vertical axial pump while additionally provide important theoretical guidance for optimization design and safe operation of the vertical axial pump.

Investigation of Unsteady Pressure Pulsation in New Type Dishwasher Pump with Special Double Tongue Volute

“…Tan et al [9] performed a numerical analysis to investigate the influence of blade rotational angle on pressure pulsation and proved that the main frequency of pressure pulsation in impeller was dominated by shaft frequency or blade frequency. Furthermore, Zhang et al [10] explored the relationship between fluid pressure pulsation and structural vibration characteristics of a vertical axial pump. It was confirmed that the rotating blades had similar frequency characteristics in both the fluid domain and the solid domain.…”

Comparative Analysis of Strength and Modal Characteristics of a Full Tubular Pump and an Axial Flow Pump Impellers Based on Fluid-Structure Interaction

“…Pei et al [16] quantitatively analyzed the blade deformation and stress distribution of the bidirectional axial-flow pump device under different flow conditions, and found that the maximum deformation and stress existed at the blade edge and the hub respectively. Zhang et al [17] discovered that the stress concentration on the blade hub was caused by the cantilever structure of the rotating blade. Li et al [18,19] conducted bidirectional FSI and modal analyses on the mixed-flow pump, and the results shown that fatigue failure was more likely to occur at the hub and the natural frequency of vibration was not affected by the flow rate.…”

“…Figure17. Vibration mode shape in each order modal of the full tubular pump: (a) First-order mode, (b) Second-order mode, (c) Third-order mode, (d) Fourth-order mode, (e) Fifth-order mode, (f) Sixth-order mode.…”

Analysis of Strength and Modal Characteristics of a Full Tubular Pump Impeller Based on Fluid-Structure Interaction

“…Pei J et al [12] quantitatively analyzed the blade deformation and stress distribution of the bidirectional axial-flow pump device under different flow conditions, and found that the maximum deformation and stress exist at the blade edge and the hub respectively. Zhang LJ et al [13] discovered that the stress concentration at the blade hub is caused by the cantilever structure of the rotating blade. Li W et al [14][15] conducted bidirectional FSI and modal analysis on the mixed-flow pump, and the results showed that fatigue failure was more likely to occur at the hub.…”