摘要：为了探究气-固两相流中颗粒对管道弯头的磨蚀机理,采用计算流体动力学软件对90°弯头进行磨蚀模拟研究。结果表明:颗粒在弯头内的轨迹是先汇聚、后发散的过程,弯头壁面上颗粒汇集程度最大的位置也是磨蚀最严重的地方;随着气流速度与颗粒粒径的改变,最大磨蚀点分布在与x=0坐标面夹角为70~90°的截面之间,并且分布在z=0平面的一侧;最大磨蚀率与颗粒流量成正比;在颗粒质量流量为0.1 kg/s的条件下,当颗粒粒径小于45μm时,气流速度对最大磨蚀率影响不大,当颗粒粒径大于45μm时,最大磨蚀率与气流速度接近二次多项式关系;当气流速度为20 m/s时,粒径介于45~75μm的颗粒的磨蚀率最大,而且颗粒流量越大,这种趋势越明显。

关键词：计算流体动力学；管道弯头；颗粒；气-固两相流；弯径比

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