目的 提高工业生产过程中弯管冲蚀预测可靠度。方法 在拉格朗日坐标系，通过CFD-DPM模型求解在流体作用下固体颗粒对弯管的冲蚀问题，并利用冲蚀方程研究流体速度、固体颗粒直径和固体颗粒质量流量分别与弯管冲蚀之间的关系，预测弯管最大冲蚀位置及模拟数值。结果 通过仿真得到弯管冲蚀最大冲蚀位置主要集中在弯管出口的水平两侧和弯管入口的垂直两侧。随着固流体速度u由8 m/s增大至18 m/s时，固体颗粒对弯管的最大冲蚀速率增大了9.912倍；冲蚀固体颗粒的质量流量f由0.2 kg/s增大到0.8 kg/s时，弯管最大冲蚀速率增大了4.527倍；当仿真过程中固体颗粒直径由200 μm增大到900 μm时，弯管的最大冲蚀速率增大了3.94倍。结论 当固体颗粒直径、固体颗粒速度和固体颗粒质量流量不变时，弯管冲蚀随着流体速度的增大而增大，弯管冲蚀区域在弯管出口水平位置逐渐增大。当固体颗粒直径增大，流体速度固体颗粒质量不变时，固体颗粒在惯性力作用下，弯管肘部的冲蚀逐渐增大，弯管出口水平两侧冲蚀逐渐减小。弯管冲蚀在固体颗粒质量流量增大时，呈增长趋势。

The work aims to improve the prediction reliability of elbow erosion during industrial production. In the Lagrangian coordinate system, the CFD-DPM model was used to solve the erosion problem of solid particles on the elbow under the action of fluid. The erosion velocity equation was used to study the relationship among fluid velocity, solid particle diameter and solid particle mass flow. The relationship between the erosion of the elbow and the maximum erosion position, simulation value and erosion of the elbow was studied to predict the maximum erosion position of the elbow erosion by simulation. The maximum erosion position of the elbow erosion by simulation was mainly concentrated on the horizontal sides of the elbow outlet and the vertical sides of the elbow inlet. As the solid fluid velocity u increased from 8 m/s to 18 m/s, the maximum erosion rate of solid particles to the elbow increased by 9.912 times, and the mass flow rate f of the eroded solid particles increased from 0.2 kg/s to 0.8 kg. The maximum erosion rate of the elbow increased by 4.527 times. When the diameter of the solid particles increased from 200 μm to 900 μm during the simulation, the maximum erosion rate of the elbow increased by 3.94 times. When the solid particle diameter, solid particle velocity and solid particle mass flow rate are constant, the elbow erosion increases with the increase of fluid velocity, and the elbow erosion region gradually increases at the horizontal position of the elbow outlet; when the diameter is increased and the fluid velocity is constant, the erosion at the bending position of the elbow is gradually increased under the action of inertial force, and the erosion on both sides of the elbow outlet is gradually reduced; the elbow erosion increased when the solid particle mass flow rate increases.