Abstract：To investigate the erosion mechanism of particles in gas-solid phase flow to pipeline elbow, the computational fluid dynamics software was used to perform the numerical simulation of the erosion on 90°pipeline elbow. The results show that the particle trajectory in the elbow is a process of converging at first and then diverging. The most serious abrasion occurs in the place where particles gather the most. With the changes of airflow velocity and particle diameter, the maximum erosion points appear in the section with the angle between section and x=0 coordinate surface of 70 to 90°, and these points distribute on the side of z=0 plane. The maximum erosion rate is proportional to the particle flow rate. Under the condition of particle mass flow rate of 0.1 kg/s, when the particle diameter is less than 45 μm, the airflow velocity has little effect on the maximum erosion rate. The maximum erosion rate is quadratic polynomial to the airflow velocity as the particle diameter is larger than 45 μm. When the particle diameter is between 45 and 75 μm,the erosion rate is the maximum with the airflow velocity of 20 m/s. The greater the flow rate of particles is, the more obvious this trend is.

Keywords: computational fluid dynamics; pipeline elbow; particle; gas solid phase flow; bend diameter ratio