Airflow field simulation model building and application for aerobic compost using CFD

作     者：Qiongyi Cheng Haibo Meng Haibin Zhou Yujun Shen Hongsheng Cheng Jingtao Ding Shihao Zhao Shance Hou 

作者机构：Academy of Agricultural Planning and EngineeringKey Laboratory of Technologies and Models for Cyclic Utilization from Agricultural ResourcesMinistry of Agriculture and Rural AffairsBeijing 100125China 

出 版 物：《International Journal of Agricultural and Biological Engineering》 (国际农业与生物工程学报（英文）)

年 卷 期：2021年第14卷第4期

页      面：245-254页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

基　　金：The project acknowledges that this work was financially supported by the Open Project of Key Laboratory of Ministry of Agriculture and Rural Affairs(KLTMCUAR2020-3) 

主　　题：CFD model building compost airflow field pile 

摘      要：Composting is a suitable low-cost strategy to transform animal waste into a stabilized end product,and the airflow field in the pile affects the fermentation *** piles in the aeration weak zone,anaerobic fermentation may happen as the lack of *** in practice,due to the extremely low speed and harsh condition,the airflow field was scarcely *** study adopted Computational Fluid Dynamics(CFD)to investigate the airflow field in the compost pile.A three-dimensional CFD model was built;the compost pile in this model was simplified as porous media;unstructured mesh was adopted to discretize the geometric model;standard k-εmodel and SIMPLE scheme were employed for numerical *** CFD model was validated with the field experiment in the cooling *** the model was applied to research the airflow field in the pile with increased pipe *** showed that it was feasible to investigate the airflow field in the pile with *** boundary conditions in the CFD model,treating the compost pile as a homogeneous porous media is *** CFD model was successfully validated by the field measurement(the average relative difference between the simulated and measured air speed was within 10%).Airflow in the existing compost pile showed nonuniform distribution with stagnation and vortex zones;the turbulence intensities were 3.57 and 1.43 for the airflow in the pile and the reactor,*** pipe diameter increased,the airflow distribution uniformity in the pile was improved *** diameter raising to 0.04 m,the turbulence intensity decreased to 1.54 and 0.42 for the airflow in the pile and the reactor,*** CFD model developed in this research can provide qualitative and quantitative analyses of the airflow field in compost piles,and can be a theoretical basis for the aeration system design.