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<p>In industrial production, centrifugal pumps are crucial for transporting solid–liquid mixtures. However, the studies on shut-off conditions remain limited. Understanding these conditions is vital for controlling performance curves and enhancing pump reliability. In this work, the CFD-DEM numerical method and the Archard wear model are employed to simulate the internal flow and wear characteristics in a solid–liquid centrifugal pump under shut-off conditions. The relative velocity streamlines, particle distribution and wear patterns on the volute, impeller, and blades for particle diameters of 0.8, 1.2, 1.6, 2, and 2.4&#xa0;mm are analyzed. Additionally, the particle trajectory of 0.8&#xa0;mm particles is tracked. The results indicate slower particle movement in the inlet section, with fewer particles entering the flow field; after leaving the impeller, particles primarily revolve within the volute. The particle size has a relatively minor effect on the shut-off head. As the particle size increases, the average wear rate slightly decreases, while the maximum wear rate increases and the wear area shrinks. The maximum error between the simulated and measured head is 5.63%, and the simulated wear areas closely match experimental observations, validating the feasibility of this method.</p>

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The Effect of Solid Particle Diameters on Flow and Wear Characteristics of Centrifugal Pumps Under Shut-off Conditions

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Yanping Wang,
  • Nan Shi,
  • Xiaofeng Deng,
  • Han Zhou

摘要

In industrial production, centrifugal pumps are crucial for transporting solid–liquid mixtures. However, the studies on shut-off conditions remain limited. Understanding these conditions is vital for controlling performance curves and enhancing pump reliability. In this work, the CFD-DEM numerical method and the Archard wear model are employed to simulate the internal flow and wear characteristics in a solid–liquid centrifugal pump under shut-off conditions. The relative velocity streamlines, particle distribution and wear patterns on the volute, impeller, and blades for particle diameters of 0.8, 1.2, 1.6, 2, and 2.4 mm are analyzed. Additionally, the particle trajectory of 0.8 mm particles is tracked. The results indicate slower particle movement in the inlet section, with fewer particles entering the flow field; after leaving the impeller, particles primarily revolve within the volute. The particle size has a relatively minor effect on the shut-off head. As the particle size increases, the average wear rate slightly decreases, while the maximum wear rate increases and the wear area shrinks. The maximum error between the simulated and measured head is 5.63%, and the simulated wear areas closely match experimental observations, validating the feasibility of this method.