摘要
为了对旋风分离器壁面冲蚀磨损机理进行研究,采用RSM模型和DPM模型对分离器内部气相流场和颗粒运动规律进行双向耦合瞬态求解,并运用自定义函数对失效壁面颗粒的受力进行研究。结果表明:常规旋风分离器中容易失效的部位主要是顶部区域顶面以下25 mm范围内的入口目标区域,筒体部分的局部穿孔以及灰斗底部的冲蚀磨穿。该区域呈现出明显的固体颗粒聚集的现象,从单颗粒的受力分析得出,中间粒径颗粒和大粒径颗粒在筒体顶端和锥体底部的受力平衡是导致灰带出现的主要原因,从而加剧了顶部和灰斗区域的冲蚀磨损。
In order to study the wall erosion mechanism of cyclone separator,the internal gas flow field of cyclone and the movement rule of particle had been analyzed with the RSM model and DPM model,and also studied the force of particles on the failure surface with the UDF. It was found that 25 mm come within the scope of top barrel was the most severe erosion position. The partial perforated of barrel and the erosion at the bottom of cyclone was also the failure position. There were obvious solid particles aggregation phenomenon in this area. From the force analysis of single particle,finding that the force equilibrium of middle size particles and the big size particles at the top of the cylinder and the bottom of the cone were the main reason for the gray zone appearance,which is adding to the erosion of the top and the ash hopper.
出处
《流体机械》
CSCD
北大核心
2017年第3期42-47,共6页
Fluid Machinery
关键词
旋风分离器
气-固两相流
冲蚀磨损
颗粒受力
数值模拟
cyclone separator
gas and solid two-phase flow
erosion wear
force analysis
numerical simulation
