Abstract
Large amounts of sediment in the Himalayan rivers causes severe silt erosion to the hydraulic machinery operating along these rivers. In this study, the effects of silt characteristics on the silt-erosion characteristics of a double-suction centrifugal pump was studied and the anti-erosion property of bionic convex domes on silt erosion under these conditions was explored by using computational-fluid-dynamics methods, partly supported by a painted-blade erosion experiment. The results show that the silt size affects the erosion position and erosion strength, whereas the silt concentration mainly affects the erosion strength for the studied range. The bionic convex domes provide an effective solution to improve the silt erosion for most of the investigated silt-laden conditions by decreasing the erosion rate and the erosion area of the blade. The anti-erosion mechanism was studied combined with large eddy simulation. The analysis shows that the relative velocity of water around the blade surface is changed and the mass flow rate of silt particles hitting the blade is reduced by inducing swirling flows around the bionic convex domes.
Highlights
Himalayan rivers contain large quantities of sediment in the form of hard abrasive mineral/rock fragments, formed by the rock fragmentation as a result of physical and chemical weathering [1].Silt erosion is a major problem faced by the hydraulic machinery operating along these rivers.The Yellow River, originating from the Himalayan glaciers, is the second largest river in China and crucially supplies water for irrigation and urban use
Double-suction centrifugal pumps are generally designed for clear water, but the Yellow River contains a high amount of silt particles
Our by Qian et al [24] applied bionic ideas to reduce silt abrasion of a double-suction centrifugal previous study by Qian et al [24] applied bionic ideas to reduce silt abrasion of a double-suction pump and the results indicate that silt erosion of a bionic impeller was lowered in comparison with centrifugal pump and the results indicate that silt erosion of a bionic impeller was lowered in that of the prototype impeller
Summary
Silt erosion is a major problem faced by the hydraulic machinery operating along these rivers. The Yellow River, originating from the Himalayan glaciers, is the second largest river in China and crucially supplies water for irrigation and urban use. With their high discharge and head, double-suction centrifugal pumps are used extensively along the valley of the Yellow River. Double-suction centrifugal pumps are generally designed for clear water, but the Yellow River contains a high amount of silt particles.
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