An experimental evaluation of vibration patterns arising from vortex flow in mixed flow pumps a case study in Upper Egypt
Dalia M. S. El-Gazzar, Abdallah H. I. Abo-Elnil, Mostafa E. A. Elsayed
TL;DR
This study investigates how inlet vortices affect vibration in mixed flow pumps and proposes a curtain wall solution to reduce vibrations and improve stability.
Contribution
The study introduces a scalable curtain wall solution to mitigate vortex-induced vibrations in pumping stations.
Findings
Vibration magnitudes increased near blade-passing frequency when vortices were present.
Curtain walls reduced maximum vibration levels by about 73%.
CFD simulations effectively visualized turbulent flows and vortex patterns.
Abstract
Mixed flow pumps, characterized by high flow rate and moderate head, are the preferred choice for pumping station installations. Nevertheless, the development of inlet vortices significantly impairs the performance of mixed-flow pumps, threatening operational stability and safety. This focuses on a large pumping station where unstable and fluctuating vibration levels were observed across four pumping units during extended operation. Over a continuous 6 h period, total vibration velocity levels were recorded at 2 h intervals. Both velocity and acceleration spectra were analyzed at all measurement sites to investigate the pronounced fluctuations in vibration. Computational fluid dynamics (CFD) simulations were employed as the primary method to realistically visualize the complex turbulent flows occurring in the pump intake under various operating conditions. The results showed that…
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Taxonomy
TopicsCavitation Phenomena in Pumps · Hydraulic flow and structures · Fluid dynamics and aerodynamics studies