基于CFD-DEM耦合法的莲子壳仁分离装置优化与试验分析
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摘要
借助FLUENT软件对莲子物料分离通道气流场分布规律进行仿真分析。采用CFD-DEM耦合法对混合物料在分离通道中的分离过程进行数值模拟。以分离气流速度、入料管倾斜角、分离通道倾斜角为因素开展了仿真试验,分析了各因素对清选率的影响,确定了分离通道的优化工艺参数为:入料管倾斜角60°、分离通道倾斜角35°、分离气流速度7.881m/s,与实体样机试验结果一致。试验结果表明CFDDEM耦合仿真方法可用于莲子物料分离的研究,所获工艺参数为莲子混合物料分离机的设计提供了参考依据。
The simulation of separation channel airflow field distribution was implemented with FLUENT software.The CFD-DEM coupling method was used to simulate the separation progress of the mixtures in the separation channel.For fluid outlet velocity,inclination angel of inlet tube and inclination angle of separating channel factors was carried out by simulation experiment,determine the optimal technological parameter of separating channel as follows:inclination angel of inlet tube was 60°,inclination angle of separating channel was 35°,fluid outlet velocity was 7.881 m/s,and the results were the same with the physical prototype.The feasibility to use CFD-DEM coupling method to study the separation device for lotus seed and its contaminates was verified.The result of this study can be taken reference for the research on separating equipment for lotus seed kernel and shell.
The simulation of separation channel airflow field distribution was implemented with FLUENT software.The CFD-DEM coupling method was used to simulate the separation progress of the mixtures in the separation channel.For fluid outlet velocity,inclination angel of inlet tube and inclination angle of separating channel factors was carried out by simulation experiment,determine the optimal technological parameter of separating channel as follows:inclination angel of inlet tube was 60°,inclination angle of separating channel was 35°,fluid outlet velocity was 7.881 m/s,and the results were the same with the physical prototype.The feasibility to use CFD-DEM coupling method to study the separation device for lotus seed and its contaminates was verified.The result of this study can be taken reference for the research on separating equipment for lotus seed kernel and shell.
引文
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[2]SHAPIRO M,GALPERIN V.Air classification of solid particles:a review[J].Chemical Engineering and Processing,2005,44(2):279-285.
[3]马秋成,卢安舸,高连兴,等.莲子物料空气动力学特性与壳仁分离装置试验[J].农业工程学报,2015,31(6):297-303.
[4]蒋梅胜,李恒,李林书,等.基于CFD-DEM耦合法的灭火机风筒优化与试验[J].农业工程学报,2015,31(8):104-111.
[5]TSUJI Y,KAWAGUCHI T,TANAKAT.Discrete particle simulation of two-dimensional fluidized Bed[J].Technology,1993,77(1):79-87.
[6]心男.基于EDEM-FLUENT耦合的气吹式排种器工作过程仿真分析[D].吉林:吉林大学,2013:35-47.
[7]LI Hong-chang,LI Yao-ming,GAO Fang,et al.CFD-DEM simulation of material motion in air-and-screen cleaning device[J].Computers and Electronics in Agriculture,2012,88:111-119.
[8]ZHOU Z Y,CHU K W,Assessments of CFD-DEM models in particle-fluid flowmodelling[J].Journal of Fluid Mechanics,2010,661:482-510.
[9]RENZO A,DI MAIO F P.Comparison of contact-force models for the simulation of collisions in DEM-based granular flow codes[J].Chemical Engineering Science,2004,59(3):525-541.
[10]卢安舸.莲子风力壳仁分离技术研究[D].湖南:湘潭大学,2015:30-34.
[11]赵扶民.自适应莲子剥壳机设计与研究[D].湖南:湘潭大学,2015:6-8.
[12]刘绍雄.莲子加工工艺与剥壳原理的分析研究[J].粮油加工与食品机械,1987(18):9-12.
[13]周银镔.莲仁物理机械特性及切削加工特性研究[D].湖南:湘潭大学,2012:28-36.
[14]唐启义.数据处理系统:实验设计、统计分析及数据挖掘[M].北京:科学出版社,2010:142-156.