固体颗粒对T型盲管弯头结构冲蚀的数值模拟

Numerical Simulation of the Erosion Characteristics of T-shape Blind Elbow by Solid Particles

利用欧拉-拉格朗日方法对T型盲管弯头中气固两相流对管壁的冲蚀程度进行三维数值模拟。通过数值模拟分析得到T型盲管弯头中流场分布情况和不同盲管长度时的最大冲蚀速率。结果表明:气体流场在T型盲管弯头后半部分可以形成气体旋涡和气垫,在一定程度上有助于降低固体颗粒对管壁的冲蚀速率。冲蚀速率随着盲管长度增加而减小;但在盲管长度为6倍管径的时候存在拐点;不同盲管长度的T型盲管弯头的最大冲蚀位置均位于盲管的末端,但随着盲管长度的增加最大冲蚀位置逐渐向下偏移;入口速度越大,最大冲蚀速率越大,同时盲管长度对冲蚀速率的影响程度越剧烈;颗粒粒径越大对管壁的冲蚀程度越大。

Euler-Lagrange method was used to simulate the erosion degree of the gas-solid two-phase flow in a Tshape blind elbow.Through numerical simulation,the flow field distribution in the T-shape blind elbow and the maximum erosion rate in different blind elbow lengths were obtained.The results show that the gas flow field could form a gas vortex in the latter half of the T-shaped blind elbow,which helped to reduce the erosion rate of the solid particles on the wall.The erosion rate decreased with the increase of the length of the blind elbow,the maximum erosion position of the T-type blind tube was located in the end of blind tube.With the increase of the length of the blind tube,the maximum erosion position gradually moved down and there was more influence of the length of the blind elbow on the erosion rate.Also the larger size of the particle,the greater the erosion rate was.