煤粉颗粒对管道壁面磨损的数值模拟研究  

Numerical study of solid particle erosion on sidewall

作　　者：杨建胜[1] 罗坤[1] 王则力[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《能源工程》2010年第4期1-4,共4页Energy Engineering

基　　金：国家自然科学基金资助项目(50976098)

摘　　要：应用计算流体动力学(CFD)研究煤灰颗粒穿过槽道中10×11错列排列AISI 304不锈钢管束时槽道壁面受到的磨损状况。流场采用直接数值模拟,流场与管束之间的耦合采用内嵌边界技术求解,颗粒轨道采用拉格朗日轨道模型求解并考虑颗粒与流体之间的双向耦合。通过选用200μm粒径的颗粒来分析颗粒对壁面的磨损状况。颗粒对壁面的碰撞频率和壁面局部质量磨损率的分布表明,壁面局部质量磨损率对壁面的磨损量起关键作用,壁面局部质量磨损量的分布也与预测值相符合。The computational fluid dynamic（CFD） tool was applied to investigate coal ash particles wear the side walls numerically when these particles follow a cross flow past a 10×11 aligned tube bank in the pipe.The flow field was obtained through direct numerical simulation,the coupling between tubes and flows were done through the immersed boundary technique and the trajectories of particles were tracked by Lagrangian approach with two-way coupling method.Coal ash particles with diameter 200 μm were used as the abrasive to show the damage on the side walls with the analyzing about the wall erosion.Finally,particle collision frequency distributions and sidewall erosion rate distribution were found.The conclusion was gotten that sidewall erosion rate was the main factor to sidewall erosion.The result of sidewall erosion distribution was perfectly matched with the predicted values.

关 键 词：直接数值模拟 内嵌边界技术 错列管束 壁面 磨损 

分 类 号：TK16[动力工程及工程热物理—热能工程]