基于非牛顿性的牛粪厌氧发酵过程的数值模拟  

NUMERICAL SIMULATION OF COW MANURE ANAEROBIC DIGESTION BASED ON NON-NEWTONIAN PROPERTY

作　　者：李少白 胡钊晨 寇巍 Li Shaobai;Hu Zhaochen;Kou Wei(College of Energy and Environment,Shenyang Aerospace University,Liaoning Key Lab of Clean Energy Shenyang 110136,China;Liaoning Institute of Energy Resources,Yingkou 115003,China)

机构地区：[1]沈阳航空航天大学能源与环境学院,辽宁省清洁能源重点实验室,沈阳110136 [2]辽宁省能源研究所,营口115003

出　　处：《太阳能学报》2021年第7期469-473,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(21406141);辽宁省教育厅科研项目(L201733);“十二五”国家科技支撑计划(2012BAC25B07)。

摘　　要：以非牛顿流体的牛粪厌氧发酵液的搅拌特性为研究对象,利用标准k-ε模型表征发酵液的湍流特性,幂律模型表征发酵液的流变性质。通过数值分析对发酵罐内部的速度场、剪切速率分布、剪切应力分布和粘度分布进行研究。结果表明,搅拌器叶片周围的速度大于其他区域,随着发酵的进行,发酵液的非牛顿性逐渐减弱,粘度分布逐渐趋于均匀,剪切速率变化不大,但剪切应力分布则趋于不均匀。The mixing characteristics of cow manure anaerobic digested broth with non-Newtonian property were studied.And the standard k-ε model was used to simulate the hydrodynamic behavior of anaerobic fermentation digested fermenter,the Power-law model was used to represent the rheological property of fermentation broth.The velocity field,shear rate distribution,shear stress distribution and viscosity distribution of the fermenter were investigated by numerical analysis.The results show that the speed around the agitator blades is larger than other regions.As the fermentation progresses,the non-Newtonian properties of the fermentation broth gradually decrease,the viscosity distribution tends to be uniform,and the shear rate does not change much,while the shear stress distribution tends to non-uniform.

关 键 词：厌氧发酵 非牛顿流体 数值分析 发酵罐 搅拌 牛粪 

分 类 号：S216.4[农业科学—农业机械化工程]