空间组合弯头气固两相流动磨损特性的数值模拟

The gas-solid two-phase flow and erosion characteristics in space elbows were numerically simulated by computational fluid dynamics (CFD), so as to study the effects of gas velocity, particle diameter, particle concentration and connection length between elbows on wall erosion rate. Results show that the most serious erosion position on the wall of the space elbow is on the outside of the first elbow, and erosion distribution presents a falloff to surrounding zone. The gas flow direction changes and solid particles would collide the side wall of the second elbow due to the inertia, resulting in the asymmetric distribution of wall erosion rate of the second elbow, as well as less wear on the side close to the pipe inlet. The maximum erosion rate of the space elbow increases exponentially with the rise of gas velocity, while increases linearly with the rise of particle concentration. With the rise of St of particles, the maximum erosion rate of the first elbow increases first and then tends to be flat, and that of the second elbow increases first and then decreases.