Measurement and simulation of the suspension velocity of flax threshing material using CFD-DEM  

作　　者：Fei Dai Wenjuan Guo Xuefeng Song Ruijie Shi Jiangfei Qu Wuyun Zhao 

机构地区：[1]College of Mechanical and Electrical Engineering,Gansu Agricultural University,Lanzhou 730070,China [2]School of Cyber Security,Gansu University of Political Science and Law,Lanzhou 730070,China

出　　处：《International Journal of Agricultural and Biological Engineering》2021年第5期230-237,共8页国际农业与生物工程学报（英文）

基　　金：supported by China Agriculture Research System of MOF and MARA(Grant No.CARS-14-1-28);Fuxi Young Talents Fund of Gansu Agricultural University(Gaufx-03Y01);Key Research and Development Program of Gansu Province(20YF3WA019).

摘　　要：In order to explore the aerodynamics characteristics of flax threshing material,and accurately obtain the movement trajectory of the material of each component in air-screen cleaning,the suspension velocities of flax grains,capsules,short stalks and capsule husks at different stages were measured by means of the suspension velocity device.The experimental results showed that the suspension velocity range was 4.55-8.64 m/s for flax grains,6.46-10.90 m/s for flax capsules,3.23-7.75 m/s for flax short stalks,and 1.06-4.21 m/s for flax capsule shells.Based on the experimental results,the overall interval distribution of each component of flax threshing material and the separation characteristics were discussed and the discrete element model of each component of the flax threshing material was established.Through simulation measurement of angle of repose of the material and the sliding friction angle with steel,the reliability of the established model was verified.The gas-solid coupling method was used to simulate the suspension velocity of each component of the flax threshing material,and the suspension velocity of the four components of flax threshing material was obtained.The simulation measurement results were within the actual measurement range,showing that the test results were basically in line with the simulation results.The simulation on the suspension velocity of different components of flax threshing material based on gas-solid coupling had high precision degree.Therefore,the feasibility of the suspension velocity of the flax threshing material measured in the simulation test based on CFD-DEM coupling was verified.

关 键 词：FLAX threshing material suspension velocity CFD-DEM numerical simulation 

分 类 号：TS1[轻工技术与工程—纺织科学与工程]