In order to reduce erosion wear of bent pipes and improve the structure of ordinary bent pipes to form arc-shaped,trapezoidal,and rectangular bent pipes,numerical simulations were conducted on four types of bent pipes using Fluent's DPM model,turbulence model,and erosion wear model.The results show that the erosion resistance of curved,trapezoidal,and rectangular bends is improved by 14.54%,3.73%,and 12.38%compared to ordinary bends,respectively.The erosion distribution of the four types of bends shows elliptical and V-shaped shapes,and the erosion wear is significantly reduced compared to ordinary bends;The maximum erosion rate of the four types of bend pipes increases with the increase of flow velocity and sand content,but the erosion area does not change with the change of flow velocity and sand content.Regardless of the value of flow velocity and sand content,the maximum erosion rate of curved bend pipes＜rectangular bend pipes＜trapezoidal bend pipes＜ordinary bend pipes;The influence of three factors,namely arc bottom length,arc height,and arrangement interval,on the maximum erosion rate of arc bends is as follows:arc height＞arrangement interval＞arc bottom length;The best combination of erosion resistance for curved bends is a curved bottom length of 3 mm,a curved height of 2 mm,and a spacing of 3 mm.The erosion resistance is 22.60%higher than that of ordinary bends.This result can provide new ideas for erosion protection and structural design of bent pipes.
right angle elbowstructural improvementerosion and wearnumerical simulation calculationerosion resistanceorthogonal experiment
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