煤粉火焰中碳烟生成及其辐射换热:模型开发与FLUENT实现  

Soot Formation and Its Radiative Heat Transfer in Coal Flames: Model Development and Implementation With FLUENT

作　　者：许开龙 吴玉新 申浩树 张海[1] XU Kailong WU Yuxin SHEN Haoshu ZHANG Hai(Key Laboratory for Thermal Science and Power Engineering of Ministry Education （Department of Thermal Engineering, Tsinghua University）, Haidian District, Beijing 100084,China)

机构地区：[1]热科学与动力工程教育部重点实验室(清华大学热能工程系),北京市海淀区100084

出　　处：《中国电机工程学报》2017年第20期5961-5969,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51476088)~~

摘　　要：利用软件提供的用户自定义标量(user defined scalar,UDS),并使用户自定义函数(user defined function,UDF)接口和用户自定义变量(user defined memory,UDM),将碳烟生成模型、碳烟辐射模型和挥发分析出模型嵌入商业计算流体力学(computational fluid dynamics,CFD)平台FLUENT中,并通过案例研究验证了开发程序在计算中尤其是大规模并行计算中的正确调用问题。结果表明,该文开发程序可应用于煤粉火焰中碳烟分布预测及其辐射传热影响分析,适用于二维或三维模型,满足常见CFD计算需求。模型预测结果及其与实验数据对比结果表明程序能较好地预测煤粉火焰中碳烟的分布,且碳烟辐射明显降低了火焰温度。该文开发的碳烟程序拓展了FLUENT性能,并使其能更好地预测煤粉火焰中的温度分布、传热量及污染物排放。The models of soot formation, soot radiation and coal devolatilization were integrated into the commercial computational fluid dynamics （CFD） software FLUENT, to predict the soot distribution and its effect on radiative heat transfer in pulverized coal combustion. User defined scalars （UDS＇s） were employed for solving the governing equations of soot parameters. Some user defined functions （UDFs） were developed to implement the models, and they were verified by case studies. The developed routines could be applied to two dimensional （2-D） or three dimensional （3-D） cases, meeting the needs of the common CFD simulations of coal flames. The consistency between the predictions and the experimental results showed that the routines well predicted the soot distribution in a coal jet flame. The soot radiation was found to significantly reduce the flame temperature. The routines developed extended the capability of FLUENT, and improved the prediction of flame temperature, heat transfer and pollutant emissions in pulverized coal combustion.

关 键 词：煤粉燃烧 碳烟 辐射换热 自定义函数 化学渗透脱挥发分模型 

分 类 号：TK16[动力工程及工程热物理—热能工程]