基于Fluent的博士帽型弯管冲蚀模拟分析

Erosion Simulation Analysis of Doctoral Cap Pipeline Elbow Based on Fluent

摘要: 为了研究博士帽型弯管的流动特性与冲蚀问题，基于Fluent软件描述和模拟实际物理现象的数学和计算框架，选用RNG k-ε模型、DPM离散相模型以及冲蚀速率公式，模拟研究了普通弯管与博士帽型弯管内的冲蚀情况，分析讨论了质量流量、气体流速、固体颗粒直径对弯管冲蚀磨损的规律。结果显示：相同条件下，博士帽型弯管空腔内气体速度和颗粒速度相比普通弯管较小，颗粒撞击弯管外壁的速度降低，因此博士帽型弯管具有优异的抗冲蚀性能；在特定条件下，流体的流速越高，粒子对弯头的磨损越显著，流速与冲蚀率呈正相关；在同一流速条件下，冲蚀率随着颗粒粒径的增大而逐步上升，最终趋于稳定。

Abstract: In order to study the flow characteristics and erosion problems of doctorial cap pipeline, according to the actual production situation on site, the corresponding physical model was established based on Ansys-Fluent fluid simulation software, and the RNG k-epsilon model, DPM discrete phase model and erosion rate equation were selected to simulate and study the erosion of ordinary pipe and doctorial cap pipe. The laws of mass flow rate, gas flow rate and solid particle diameter on erosion wear of pipe were analyzed and discussed. The findings indicate that, under identical conditions, the gas velocity and particle velocity in the cavity of the Bosch cap bend are smaller than that of the ordinary bend, and the velocity of the particles impacting the shell of the bend is reduced, so the Bosch cap bend has a good anti-erosion effect. Under certain conditions, the faster the fluid velocity is, the more obvious the erosion of particles on the bend, and the flow velocity is positively correlated with the erosion rate. At the same flow rate, the erosion rate increases gradually with the increase of particle size, and finally tends to be stable. The simulation results show that the doctorial cap pipe has strong erosion resistance, and the mass flow rate, gas flow rate and the diameter of solid particles are the main factors affecting the erosion rate of pipeline elbow.