Abstract
To study the flow characteristics and the wear distribution of pumps at different rotation speeds, a rotating disc with three blades was designed for experiments. Numerical simulations were conducted using a computational fluid dynamics-discrete phase model (CFD–DPM) approach. The experimental and numerical results were compared, and the flow characteristics and wear behaviors were determined. As the speed increased, the particles at the blade working surface aggregated. The particle velocity gradually increased at the outlet of the channel. The severe wear areas were all located in the outlet area of the blade working surface, and the wear area extended toward the inlet area of the blade with increasing speed. The wear rate of the blade surface increased as the speed increased, and an area with a steady wear rate appeared at the outlet area of the blade. When the concentration was more than 8%, the severe wear areas were unchanged at the same speed. When the speed increased, the severe wear areas of the blade produced wear ripples, and the area of the ripples increased with increasing speed. The height difference between the ripples along the flow direction on the blade became larger as the speed increased.
Highlights
Centrifugal slurry pumps are widely used for the transport of solid materials in mining, water conservation applications, power generation, dredging, the chemical industry, and other industries.These pumps have been developed by modifying the conventional centrifugal pump design to ensure the smooth delivery of solid–liquid two-phase flow [1]
Xiao et al [3] used numerical simulations to study the effects of geometric model changes on the flow characteristics and wear mechanism of centrifugal pumps after impeller wear caused by 0.5-mm-diameter solid particles
Tressia et al [6] studied the effect of different particle sizes (0.15–2.4 mm) on the wear resistance of steel in solid–liquid two-phase flow
Summary
Centrifugal slurry pumps are widely used for the transport of solid materials in mining, water conservation applications, power generation, dredging, the chemical industry, and other industries. Xiao et al [3] used numerical simulations to study the effects of geometric model changes on the flow characteristics and wear mechanism of centrifugal pumps after impeller wear caused by 0.5-mm-diameter solid particles. Tressia et al [6] studied the effect of different particle sizes (0.15–2.4 mm) on the wear resistance of steel in solid–liquid two-phase flow. Designed a wear test bench to use solid particles with 660-μm-diameter to determine the material wear coefficient under different erosion conditions. They effectively predicted the wear life of the mud pump over-flow components. Through the research of these scholars, it was seen that the particles size and rotation speed of the impeller can significantly affect the flow characteristics and wear laws. The flow in the test unit was numerically simulated using computational fluid dynamics (CFD), and the results were compared and verified with the experimental data
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