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In order to address the problem of erosion failure of the reducer, numerical simulation of the reducer was carried out based on the DPM model, realizeble k-ε model and particle wear equation to analyse the flow velocity, particle diameter, mass flow rate, transition inclination, the improved transition angle of the reducer's erosion and wear law and the performance of the improved reducer. The results show that the erosion wear is most serious at the intersection of the transition section and the small pipe. The maximum erosion rate increases gradually with the increase of flow velocity, mass flow rate and the decrease of particle diameter. The transition Angle increases from 5° to 35°, and the maximum erosion rate fluctuates from 9. 32 × 10 - 5 kg/ (m 2·s). The maximum erosion rate increases from 35° to 85°, and then decreases significantly. When 80° ~ 85°, the maximum erosion rate is small and the influence of various factors is small, especially when 85°, the maximum erosion rate is reduced by 23. 5 times. The maximum erosion rate of the transition fillet 7. 5 ~ 15 mm is less than that of the transition fillet before the improvement, and the erosion distribution is more uniform. With the increase of the transition Angle, the difference of the maximum pressure in the modified 2. 5 ~ 15 mm transition reducer is gradually reduced, and the maximum pressure and stress in the modified pipe are lower than those in the modified pipe, and the maximum pressure in the pipe is reduced by 2. 25 times. The results can provide reference for the selection, structural design and optimization of the reducer in practice. [ABSTRACT FROM AUTHOR]

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