管道内气固两相流冲刷磨损特性数值模拟

Numerical Simulation of Scouring Erosion Characteristics for Gas-solid Two-phase Flow in Pipes

针对有色冶金中低温烟气对管道材料的冲刷磨损,利用计算流体力学软件Fluent对气固两相流开展数值模拟研究,讨论了冲刷磨损量和切应力在不同烟气速度、颗粒直径、颗粒含量时的变化情况。结果表明:气固两相流冲刷集中磨损区位于管道前部约1/5处,最大磨损发生在管道入口后部;烟气速度增大时,磨损量与切应力都增大;在一定颗粒直径范围内,颗粒直径增大时,磨损量减小,切应力几乎不变;随着颗粒含量增加,磨损量增大,切应力基本不变。

Aiming at the scouring erosion characteristics of flue gas with medium or low temperature to pipes in nonferrous metallurgy,using the fluid dynamics software Fluent,makes numerical simulations investigation to gas-solid two-phase flow,discusses variational situations of the scouring erosion quantity and the shear stress in distinct flue gas flow velocity,solid particles diameter and content.The results show that,the scouring erosion zone of gas-solid two-phase flow centers on about the front 1/5 part of the pipe and its maximum erosion occurs behind the pipe entrance.The erosion quantity and shear stress increase with increasing of the flue gas flow rate.In a certain range of particles diameter,the erosion quantity decreases whereas the shear stress nearly keeps constant with the increasing of the particle diameter.The erosion quantity increases whereas the shear stress nearly keeps constant with increasing of the particle content.