考虑多孔介质形态的燃烧模拟研究:孔隙结构和材料的影响  

Simulation of Porous Media Combustion Considering Morphology:Effect of Cell Structure and Porous Material

作　　者：李亮[1] 张瑞方 张扬[1,2] 张海 LI Liang;ZHANG Ruifang;ZHANG Yang;ZHANG Hai(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Shanxi Clean Energy Research Institute,Tsinghua University,Taiyuan 030032,China)

机构地区：[1]清华大学能源与动力工程系,热科学与动力工程教育部重点实验室,北京100084 [2]清华大学山西清洁能源研究院,太原030032

出　　处：《工程热物理学报》2025年第1期310-318,共9页Journal of Engineering Thermophysics

基　　金：国家重点研发计划课题(No.2021YFA0716201);清华大学山西清洁能源研究院“揭榜挂帅”项目(No.2023JZ0501001)。

摘　　要：多孔介质燃烧可提高燃烧速率和稳定性,实现预混燃气在极贫/富燃条件下的稳定燃烧,拓展可燃极限。本文基于多孔介质的体积平均假设,建立了考虑多种形态特征的多孔介质燃烧模型,对不同结构与材料参数条件下的多孔介质燃烧特性进行了模型计算。分析表明,孔隙率、平均孔径、弯曲度、材料热导率和发射率这五个参数通过控制气固换热、导热和辐射过程影响多孔介质中的燃烧状态。由于辐射的作用,孔隙结构对燃烧速率的影响相比材料更加显著,较小的孔径和较高的弯曲度会促进气固换热过程并提升燃烧速率,但气固换热过于强烈将增强辐射热损失,无法实现稳定燃烧,出现多孔介质熄火。模型所预测的孔隙结构与材料对多孔介质燃烧特性的影响规律与实验结果一致。Porous media combustion can improve the burning rate and flame stability,achieve stable flame in ultra-lean/rich conditions,and expand the flammability limit.Based on the assumption of homogeneous porous media,a combustion model considering multiple porous media morphological features is established,and the combustion characteristics in porous media with different structural and material parameters are calculated.The results show that five parameters,namely,porosity,mean pore diameter,tortuosity,material thermal conductivity and emissivity,affect the combustion state in porous media by influencing the gas-solid heat transfer,thermal conductivity and radiation processes.Due to the effect of radiation,the pore structure has a more significant effect on the combustion rate compared to the material parameters,smaller pore diameter and higher tortuosity will improve the gas-solid heat transfer process and enhance the burning rate,while overly intense gas-solid heat transfer will enhance the radiative heat loss,and lead to combustion instability and quenching in porous media.The trend of the cell structure and porous material influence on the porous media combustion characteristics obtained from the model calculations is consistent with the experimental results.

关 键 词：多孔介质燃烧 孔隙结构 模型预测 燃烧速率 

分 类 号：TK16[动力工程及工程热物理—热能工程]