基于CFD-DEM耦合的揉丝机排料装置内物料运动模拟与试验
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摘要
为解决传统物理方法难以对揉丝机排料装置内物料运动进行可视化研究的问题,基于CFD-DEM气固耦合法,采用RNG K-ε湍流模型及Euler-Lagrange耦合算法对揉丝机不同主轴转速下排料装置内物料运动过程、内流道气流速度分布、气流对物料的耦合力分布进行了数值模拟,并对风扇主轴转速3 000r/min时物料运动过程进行分区域研究。结果表明:在风扇主轴额定转速3 200r/min范围内,主轴转速2 000、2 500和3 000r/min在模拟结束时分别排出物料数量为6 191、6 669和7 161个;不同区域内物料平均速度形成梯度分布,由大到小依次为物料出口区域(10.00m/s)、风扇转动区域(6.00m/s)、物料入口区域(0.87m/s);风扇转动区域气流速度最大(峰值50.00m/s),对物料耦合力作用最强,物料入口区域则耦合力最小;物料在入口区域内数量最多并在模拟结束时发生少量堆积,在出口区域未见回流现象发生。对模拟结果进行了试验验证,结果表明利用CFD-DEM气固耦合法对揉丝机排料装置内物料运动进行可视化研究是可行的。
It was difficult to do visualization research by traditional physical methods for the materials movement in the discharging device of kneading machine.Based on CFD-DEM gas-solid coupling method,numerical simulation for kneading machine on the process of materials movement in the discharging device under the different spindle velocity,air flow velocity distribution in internal flow field and coupling force distribution that air flow acts on the materials were analyzed by using RNG K-εturbulence model and Euler-Lagrange coupling algorithm.The materials movement process when fan spindle velocity reached to 3 000r/min was studied by dividing into different parts.The simulation results showed that:When the rated rotation velocity of fan spindle was within 3 200r/min,the spindle velocity was 2 000,2 500 and 3 000r/min.At the end of the simulation,the materials quantities that discharging device produced were6 084,6 784 and 7 584,respectively;The average velocity of materials in different zones formed a gradient distribution,which in descending order according to speed were materials outlet zone(10.00m/s),fan rotation zone(6.00m/s),materials inlet zone(0.87m/s);The air flow velocity in fan rotation zone was maximum(peak value was 50.00m/s)and this zone also had the strongest coupling force for the materials,while coupling force in materials inlet zone was the minimum;Quantity of materials in the inlet zone was the maximum and had a small accumulation at the end ofsimulation,and there was no backflow phenomenon in the outlet zone.In order to verify the simulation results,an experimental test was conducted showing that it was feasible to use CFD-DEM gas-solid coupling method to do visualization research for the materials movement in the discharging device of kneading machine.
It was difficult to do visualization research by traditional physical methods for the materials movement in the discharging device of kneading machine.Based on CFD-DEM gas-solid coupling method,numerical simulation for kneading machine on the process of materials movement in the discharging device under the different spindle velocity,air flow velocity distribution in internal flow field and coupling force distribution that air flow acts on the materials were analyzed by using RNG K-εturbulence model and Euler-Lagrange coupling algorithm.The materials movement process when fan spindle velocity reached to 3 000r/min was studied by dividing into different parts.The simulation results showed that:When the rated rotation velocity of fan spindle was within 3 200r/min,the spindle velocity was 2 000,2 500 and 3 000r/min.At the end of the simulation,the materials quantities that discharging device produced were6 084,6 784 and 7 584,respectively;The average velocity of materials in different zones formed a gradient distribution,which in descending order according to speed were materials outlet zone(10.00m/s),fan rotation zone(6.00m/s),materials inlet zone(0.87m/s);The air flow velocity in fan rotation zone was maximum(peak value was 50.00m/s)and this zone also had the strongest coupling force for the materials,while coupling force in materials inlet zone was the minimum;Quantity of materials in the inlet zone was the maximum and had a small accumulation at the end ofsimulation,and there was no backflow phenomenon in the outlet zone.In order to verify the simulation results,an experimental test was conducted showing that it was feasible to use CFD-DEM gas-solid coupling method to do visualization research for the materials movement in the discharging device of kneading machine.
引文
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[21]喻黎明,邹小艳,谭弘,严为光,陈立志,熊子维.基于CFDDEM耦合的水力旋流器水沙运动三维数值模拟[J].农业机械学报,2016,47(1):126-132Yu L M,Zou X Y,Tan H,Yan W G,Chen L Z,Xiong Z W.3D numerical simulation of water and sediment flow in hydrocyclone based on coupled CFD-DEM[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(1):126-132(in Chinese)
[22]DEM-Solutions.EDEM 2.7 User Guide[M].Edinburgh:DEM-Solutions,2015
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[2]丛宏斌,王克恒,李汝莘,付静,孙贵斌.锥辊式玉米秸秆揉搓装置的设计[J].农业机械学报,2007,38(2):81-84Cong H B,Wang K H,Li R S,Fu J,Sun G B.Design of a corn stalk rubbing cone[J].Transactions of the Chinese Society for Agricultural Machinery,2007,38(2):81-84(in Chinese)
[3]杨亚洲,徐杰,王景立,陆朝辉,刘庆福.新型青玉米秸秆切碎机的设计[J].扬州大学学报:自然科学版,2010,13(2):41-43Yang Y Z,Xu J,Wang J L,Lu Z H,Liu Q F.Design of a new chopper for green corn stalk[J].Journal of Yangzhou University:Natural Science Edition,2010,13(2):41-43(in Chinese)
[4]吴修文,王军.9Z-30大型青贮铡切揉丝机的研究[J].农业装备与车辆工程,2015,53(8):9-12Wu X W,Wang J.Research on 9Z-30large-scale silage cutting and rubbing machine[J].Agricultural Equipment&Vehicle Engineering,2015,53(8):9-12(in Chinese)
[5]NY/T509—2015,秸秆揉丝机质量评价技术规范[S].北京:中国标准出版社,2015NY/T509—2015,Technical Specifications of Quality Evaluation for Crop Straw Rubbing Filament Machines[S].Beijing:Standards Press of China,2015(in Chinese)
[6]蒋梅胜,李恒,李林书,彭凯,王顺喜.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):104-111Jiang M S,Li H,Li L S,Peng K,Wang S X.Simulation optimization and test of fire extinguisher funnel based on CFDDEM coupling method[J].Transactions of the Chinese Society of Agricultural Engineering,2015,31(8):104-111
[7]陈庆光,徐忠,张永建.RNG K-ε模式在工程湍流数值计算中的应用[J].力学季刊,2003,24(1):88-95Chen Q G,Xu Z,Zhang Y J.Application of RNG K-εmodels in numerical simulations of engineering turbulent flows[J].Chinese Quarterly of Mechanics,2003,24(1):88-95(in Chinese)
[8]温正.FLUENT流体计算应用教程[M].2版.北京:清华大学出版社,2007Wen Z.FLUENT Fluid Calculation Applications Tutorial[M].2 ed.Beijing:Tsinghua University Press,2007(in Chinese)
[9]丁欣硕,焦楠.Fluent 14.5流体仿真计算从入门到精通[M].北京:清华大学出版社,2014Ding X S,Jiao N.Fluent 14.5 Fluid Simulation Calculation from the First Step to the Master[M].Beijing:Tsinghua University Press,2014(in Chinese)
[10]王超,黄胜,常欣,郭春雨.基于滑移网格与RNG k-ε湍流模型的桨舵干扰性能研究[J].船舶力学,2011,15(7):715-721Wang C,Huang S,Chang X,Guo C Y.Research on the hydrodynamics performance of propeller-rudder interaction based on sliding mesh and RNG k-εmodel[J].Journal of Ship Mechanics,2011,15(7):15-721(in Chinese)
[11]Boac J M,Ambrose R P K,Casada M E,Maghirang R G,Maier D E.Applications of discrete element method in modeling of grain postharvest operations[J].Food Engineering Reviews,2014,6(4):128-149
[12]Oldal I,Safranyik F.Extension of silo discharge model based on discrete element method[J].Journal of Mechanical Science&Technology,2015,29(9):3789-3796
[13]Kuang S B,Yu A B,Zou Z S.Computational study of flow regimes in vertical pneumatic conveying[J].Industrial&Engineering Chemistry Research,2009,48(14):6846-6858
[14]凌桂龙.ANSYS Workbench 15.0从入门到精通[M].北京:清华大学出版社,2014Ling G L.ANSYS Workbench 15.0from the First Step to the Master[M].Beijing:Tsinghua University Press,2014(in Chinese)
[15]尚坦.秸秆揉丝机揉搓机构内流场仿真及流固耦合分析[D].杨凌:西北农林科技大学,2014Shang T.Anslysis of fluild-structure interaction and simulation of internal flow field for cornstalk rubbing silk machine[D].Yangling:Northwest A&F University,2014
[16]王丽娟,石林榕,杨国军,张绢,戴飞,张锋伟.玉米秸秆切割过程的非线性数值模拟与仿真试验[J].干旱地区农业研究,2013,31(6):252-256Wang L J,Shi L R,Yang G J,Zhang J,Dai F,Zhang F W.Nonlinear numerical simulation and simulation test on the cutting process of corn stalk[J].Agricultural Research in the Arid Areas,2013,31(6):252-256(in Chinese)
[17]蒋恩臣,孙占峰,潘志洋,王立军.基于CFD-DEM的收获机分离室内谷物运动模拟与试验[J].农业机学报,2014,45(4):117-122Jiang E C,Sun Z F,Pan Z Y,Wang L J.Numerical simulation based on CFD-DEM and experiment of grain moving laws in inertia separation chamber[J].Transactions of the Chinese Society for Agricultural Machinery,2014,45(4):117-122(in Chinese)
[18]刘立意,郝世杨,张萌,刘冬梅,贾富国,权龙哲.基于CFDDEM的稻谷通风阻力数值模拟与试验[J].农业机械学报,2015,46(8):27-32Liu L Y,Hao S Y,Zhang M,Liu D M,Jia F G,Quan L Z.Numerical simulation and experiment on paddy ventilation resistance based on CFD-DEM[J].Transactions of the Chinese Society for Agricultural Machinery.2015,46(8):27-32(in Chinese)
[19]胡国明.颗粒系统的离散元素法分析模拟[M].武汉:武汉理工大学出版社,2010Hu G M.Analysis and Simulation of Particle System by Discrete Element Method[M].Wuhan:Wuhan University of Technology Press,2010(in Chinese)
[20]石林榕,吴建民,赵武云,孙伟,孙步功,张锋伟.基于CFDEDEM耦合的小区玉米帘式滚筒干燥箱数值模拟[J].干旱地区农业研究,2014,32(6):273-278Shi L R,Wu J M,Zhao W Y,Sun W,Sun B G,Zhang F W.The numerical simulation for corn curtain roller drying box based on CFD-DEM coupling[J].Agricultural Research in the Arid Areas,2014,32(6):273-278(in Chinese)
[21]喻黎明,邹小艳,谭弘,严为光,陈立志,熊子维.基于CFDDEM耦合的水力旋流器水沙运动三维数值模拟[J].农业机械学报,2016,47(1):126-132Yu L M,Zou X Y,Tan H,Yan W G,Chen L Z,Xiong Z W.3D numerical simulation of water and sediment flow in hydrocyclone based on coupled CFD-DEM[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(1):126-132(in Chinese)
[22]DEM-Solutions.EDEM 2.7 User Guide[M].Edinburgh:DEM-Solutions,2015
[23]王娟,王春光,王芳.基于FLUENT的9R-40型揉碎机三维流场数值模拟[J].农业工程学报,2010,26(2):165-169Wang J,Wang C G,Wang F.Numerical simulation on threedimensional turbulence air flow of 9R-40rubbing and breaking machine based on FLUENT software[J].Transactions of the Chinese Society of Agricultural Engineering,2010,26(2):165-169(in Chinese)