固体颗粒对液/固两相流弯管冲蚀作用分析

Analysis on Erosion of Pipe Bends Induced by Liquid-solid Two-phase Flow

采用计算流体动力学(CFD)方法分析了不同颗粒参数包括固体颗粒流速、流量及粒径大小对于弯管不同截面冲蚀速率的影响,求解得到固体颗粒运动轨迹,结合颗粒碰撞模型得到颗粒运动对管壁的冲蚀作用。结果表明:冲蚀严重区域主要存在于下游直管段与弯头连接处的侧壁以及下游直管段与弯头连接处的外侧;Stokes数的变化会导致冲蚀严重区域的移动,下游直管段与弯头连接处侧壁区域并不是都会发生严重冲蚀。

The effect of particle-parameters of a liquid-solid two phase flow on the erosion rate of different sections for pipebends was analyzed by means of computational fluid dynamics （CFD） in terms of flow rate, particle size and particle velocity etc., while the trajectories of particles were cal- culated by Lagrange method. Then the relevant erosion mechanism of pipe wall may be acquired by considering the known particle collision model. The results show that： （1） the vulnerable areas mainly exist on the sidewall, as well as the outermost side of the junction of downstream straight pipe and elbow; （2） the change of Stokes number can cause shift of the serious erosion area, whilst not the entire sidewall of the junction of downstream straight pipe and elbow will be subjected to serious crosion.