The Influence of the Thickness of the Centrifugal Pump Impeller Blade in Coordination with the Circumferential Length Change of the Trailing Edge on the Flow-Induced Excitation

抄録

To explore the suppression mechanism of flow-induced vibration (FIV) in centrifugal pumps via coordinated optimization of blade thickness and trailing edge circumferential length, three impellers were designed by adjusting these parameters while maintaining other geometric features. Numerical simulations and steady/unsteady analyses compared internal flow structures, validated experimentally. Results indicate the model 3 achieved a 0.03m head increase and 6.25% efficiency gain under design conditions. Blade thickening improved mid-blade load uniformity, suppressing secondary flows and reducing pressure pulsation amplitude by 11%. Extending the trailing edge circumferential length enhanced radial flow constraint at the impeller outlet, mitigating wake jet effects and lowering pressure pulsation amplitude by 25.5% versus the model 1. Both modifications mitigated the dominant single-blade-frequency pressure pulsations in the impeller and volute, reducing flow-induced vibration during operation.