孔隙分布不均匀性对渗透率影响的MRTLBM法研究  

Study on heterogeneity of pore structure to permeability by MRT LBM

作　　者：马斌[1] 史琳[2] 黄超 许强辉 

机构地区：[1]兰州交通大学机电工程学院,兰州730070 [2]清华大学能源与动力工程系工程热物理研究所,北京100081

出　　处：《中国科学院大学学报（中英文）》2018年第2期193-199,共7页Journal of University of Chinese Academy of Sciences

基　　金：国家自然科学基金面上项目(51236004);国家自然基金创新团队项目(51621062)资助

摘　　要：孔隙率与渗透率是多孔介质非常重要的属性参数,采用MRT LBM研究孔隙率损失与渗透率损失相关性以及同孔隙率异构孔隙对渗透率特性的影响。结果表明:当存在使孔隙率均匀变小的沉积、沉降或结焦等因素时,渗透率损失率是孔隙率损失率的2倍左右;同孔隙率异构多孔体中,渗透率有巨大差异;同孔隙率异构多孔体中最大孔喉最小孔喉比越大渗透率越小;同孔隙率多孔体中迂曲度越大渗透率越小。Porosity and permeability are very important characters of a porous media. In this work,MRT LBM was used to study the pore structure influence on permeability and the porosity loss influence on permeability loss. Our simulation results are shown as follows. If there are some factors which cause even decreasing of porosity,such as that of depositing,sediment,and coking,the scope of permeability loss is larger than that of porosity loss. In same-porosity-different-structure（SPDS） porous media,there are extraordinary differences in permeability depending on their own pore structures. A larger ratio of max throat length to min throat length leads to a smaller permeability,and a larger tortuosity leads to a smaller permeability.

关 键 词：渗透率损失 MRT LBM 同孔隙率异构多孔体 最大孔喉最小孔喉比 迂曲度 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]