Abstract
This article studies the flow trajectories and the wear law of sediment particles in a pump considering multiple variables, such as sediment concentration, particle size, and cavitation stage. In addition, the mechanism of joint effects of cavitation and sediment wear of the axial-flow pump is explored. In this work, the characteristics of cavitation and sediment wear in an axial-flow pump are investigated by the numerical simulation using shear stress transport k–ω turbulence model with experimental validation. The external characteristics of experimental results and numerical simulations are in agreement. The results show that the sediment concentration exerts a profound influence on the vacuole distribution in the pump, while the particle size has little effect on it. Cavitation can increase the volume fraction of the solid, accelerate the wear on the components, and affect the sediment distribution in the impeller. Cavitation and sediment wear are mutually worsening, and their joint effects will form a vicious circle. With the decrease in inlet pressure and the increase in sediment concentration and particle size, the maximum wear rate will gradually increase, which proves that cavitation, sediment concentration, and particle size are the main factors that influence the maximum wear rate.
Highlights
The selection, design, and test of the axialflow pump conveying solid particles are carried out in accordance with the axial-flow pump for clean water
The intervention in the cavitation performance of axialflow pump imposed by sediment concentrations (Cm) and particle size (d) is analyzed
It can be seen from the figure that the calculated values of the external characteristics accord with the experimental values, indicating that the stress transport (SST) k–v turbulence model is applicable in the numerical calculation when the axial-flow pump conveys clean water and sandy water
Summary
The selection, design, and test of the axialflow pump conveying solid particles are carried out in accordance with the axial-flow pump for clean water. When the pump cavitation occurs, the impeller will be impaired by joint effects of cavitation and sediment wear, resulting in damage completely different from cavitation or wear alone, but even more serious.[1,2]. The existing literature focuses on investigating cavitation[3,4,5,6,7,8] and sediment wear[9,10,11,12,13,14] of the pump with little consideration of the joint effects of cavitation and sediment wear.
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