Blade wear characteristics of vertical axial flow pump blades in muddy river flow
In order to investigate the abrasion problem of vertical axial flow pumps for water diver-sion in a river with heavy sediment,based on the particle solid-liquid two-phase flow model and Tabakoff wear model,the movement law of sediment particles in the axial flow pump device with 5 combinations of sediment particle sizes and 5 combinations of sediment content under 6 flow conditions and their effects on the wear of axial flow pump blades are studied.The results show that the change of flow rate has a significant effect on the motion trajectory of sediment particles,and the movement trend of sediment particles towards the working face of the blade is more obvious at low flow rate,the blade is more easily worn,and the wear position is mainly at the water inlet edge and the outer edge of the blade.The change of particle size also has a significant effect on the motion trajectory of sediment particles.Large particle size sediment particles are more likely to hit the working surface of the blade and aggravate the wear.When the particle size increases from 0.01 mm to 1 mm,the maximum wear rate of the blade increases from 0.001 kg·m-2·s-1to 0.024 4 kg·m-2·s-1.The change of sediment content has little effect on the motion trajectory of sediment particles,but the increase of sediment content will aggravate the wear.When the sedi-ment content increases from 0.01 to 0.2,the maximum wear rate of the blade increases from 0.001 8 kg·m-2·s-1 to 0.061 kg·m-2·s-1.Both blade wear strength and blade wear area are positively correlated with particle size and sand content.The larger the particle size and sand con-tent,the larger the wear strength and wear area of the blade.
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