Abstract
This paper used a combination of numerical simulations and experiments to study the hydraulic performance and the wear law of a centrifugal pump when conveying mixed particle sizes. The numerical simulation was based on the Discrete Phase Model (DPM). The model was used to complete the mutual coupling between the solid particles and the flow field as well as the calculation of wall wear. The results show that under the same mass concentration, the head and the efficiency of the centrifugal pump were significantly improved with an increase in the small particle composition. Compared with transporting single-sized large particles, the wear law of the mixed particle size on the flow parts changed greatly. The addition of a certain number of small-sized particles to large-sized particles aggravated the wear of the impeller, but when the small particles occupied a relatively high proportion, the wear area of the impeller was reduced even smaller than that for the transportation of single-sized large particles.
Highlights
The solid-liquid two-phase flow problem in deep-sea mining centrifugal pumps is mostly caused by the existence of particles affecting the flow field in a centrifugal pump [2]
In order to study the effects of different particle size components on the performance of the centrifugal pump, a performance comparison experiment for the three component particles with the same mass concentration of 7% was designed, and the relevant numerical simulation calculation was carried out based on the experiment
In the impeller of the mixed-particle solid–liquid two-phase flow of the centrifugal pump, the concentration of the particles was low at the inlet of the impeller, and the flow velocity at the inlet was lower than the flow velocity at the trailing edge of the pressure surface
Summary
With the increasing demand for mineral resources from social industries, deep-sea mining technology has entered a period of rapid development. The solid-liquid two-phase flow problem in deep-sea mining centrifugal pumps is mostly caused by the existence of particles affecting the flow field in a centrifugal pump [2]. The performance changes and the collision of particles with the wall cause the reliability of the wall surface of the flow-passing part’s wear to decrease, so it is necessary to carry out research on the performance and wear of a centrifugal pump with solid–liquid mixed transportation [3,4]. Song [5] studied the influence of particle diameter on a centrifugal pump. As the diameters of the particles increased, the speeds at which the particles moved to the pressure side of the blade’s inlet increased, forming point-like impact erosion. Kumar [6] studied the performance characteristics of a centrifugal slurry pump with a multi-sized particulate slurry of bottom ash and fly ash mixtures.
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