水稻收获脱出物内圆筒筛分运动规律仿真研究
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摘要
文中采用离散单元法(Discrete Element Method,EDM)多球聚合自动填充精确构建南粳9108水稻收获脱出物各成分颗粒模型,并数值计算混合物在圆筒筛中的筛分过程。分析了圆筒筛转速、直径、孔径和倾角对混合物各成分运动规律的影响。仿真结果显示:圆筒筛孔径和倾角对各成分轴向平均速度、筛下籽粒分布、筛分清洁率、筛分损失率及筛分效率均有较大影响;圆筒筛转速对籽粒和瘪籽粒的轴向平均速度有较大影响;圆筒筛直径对籽粒和瘪籽粒的轴向平均速度、筛下籽粒分布均有较大影响。文中研究了混合物内圆筒筛分过程中的运动规律,为研制出适合小田块耕作的轻简型谷物联合收获机筛分系统提供了新的研究方法与合理的设计参考。
In this article, Discrete Element Metho(DEM)is adopted to build the accurate model of Nangeng NO.9108 threshed rice(grains, shriveled grains and short stalks)and calculate the grain mixture's screening process in a cylinder sieve.The influence of the cylinder sieve's rotation speed, diameter, aperture and inclination angle on the motion laws and screening characteristics of threshed rice is analyzed. The simulation results show that cylinder sieve's aperture and inclination angle have great influence on the axial average velocity of each component and the grain distribution under the sieve; the cylinder sieve's rotation speed has great influence on the axial average velocity of grains and shriveled grains; the cylinder sieve's diameter has great influence on the axial average velocity of grains and shriveled grains as well as the grain distribution under the sieve.Thus, the motion law of mixtures through a cylinder sieve is explored. The results provide a new research method and reasonable design reference for the cylinder-sieve subsystem suitable for grain harvest.
In this article, Discrete Element Metho(DEM)is adopted to build the accurate model of Nangeng NO.9108 threshed rice(grains, shriveled grains and short stalks)and calculate the grain mixture's screening process in a cylinder sieve.The influence of the cylinder sieve's rotation speed, diameter, aperture and inclination angle on the motion laws and screening characteristics of threshed rice is analyzed. The simulation results show that cylinder sieve's aperture and inclination angle have great influence on the axial average velocity of each component and the grain distribution under the sieve; the cylinder sieve's rotation speed has great influence on the axial average velocity of grains and shriveled grains; the cylinder sieve's diameter has great influence on the axial average velocity of grains and shriveled grains as well as the grain distribution under the sieve.Thus, the motion law of mixtures through a cylinder sieve is explored. The results provide a new research method and reasonable design reference for the cylinder-sieve subsystem suitable for grain harvest.
引文
[1]李寒松.谷物收获机械发展技术瓶颈实现新突破[J].农业装备与车辆工程,2017(1):55.
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[12] Zhang L,Xue D,Ma S, et al. Reserch on impurities of the cropstrawand trommel sieve[J]. Taiyangneng Xuebao/acta Energiae Solaris Sinica,2014, 35(3):433-438.
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[14] Wang D, Servin M, Mickelsson K O. Outlet design optimization based on large-scale nonsmooth DEM simulation[J]. Powder Technology,2014, 253:438-443.
[15] Sinnott M D, Cleary P W, Morrison R D. Combined DEM and SPH simulation of overflow ball mill discharge and trommel flow[J]. Minerals Engineering,2017, 108:93-108.
[16]胡国明.颗粒系统的离散元素法分析仿真[M].武汉:武汉大学出版社, 2010.
[17] Li H, Qian Y, Cao P, et al. Calculation method of surface shape feature of rice seed based on point cloud[J].Computers and Electronics in Agriculture,2017, 142:416-423.
[18]解元玉.基于ANSYS Workbench的流固耦合计算研究及工程应用[D].太原:太原理工大学, 2011.
[19] Li H, Li Y, Gao F, et al. CFD-DEM simulation of material motion in air-and-screen cleaning device[J]. Computers and Electronics in Agriculture,2012, 88:111-119.
[20]原建博,吴崇友,李骅,等.我国南方两种水稻脱出物物理特性测定与分析[J].农机化研究,2018(2):154-159.
[21]乔振先.水稻籽粒材料力学特性研究[J].江西农业大学学报,1992(1):1-9.
[2]孟繁昌,庞凤斌,叶耘,等.联合收获机水稻收获性能对比试验[J].农业机械学报,2005(5):141-143.
[3]马征,李耀明,徐立章.农业工程领域颗粒运动研究综述[J].农业机械学报,2013(2):22-29.
[4]貌建华,朱永宁,陶滨友.新型圆筒筛清选机构物料运动规律的试验研究[J].洛阳工学院学报,1990(1):23-29.
[5]朱永宁,周学建,吴长来,等.新型圆筒筛清选机构性能的计算机辅助设计[J].洛阳工学院学报, 1992(1):12-18.
[6]闸建文,何芳,汪裕安.圆筒筛筛分的过筛率及其影响因素[J].农业机械学报,1995(2):63-68.
[7]杨秀伦.不同材料形状物料颗粒透筛性能的研究[D].郑州:郑州大学,2007.
[8] Lau S T,Cheung W H,Kwong C K,et al. Removal of batteries from solid waste using trommel separation[J].Waste Management,2005, 25(10):1004-1012.
[9] Carla N, Natascia M, Raffaele S. The improvement of hog fuel by removing fines, using a trommel screen[J]. Biomass and Bioenergy, 2015, 75:155-160.
[10] Harvey A, Jerome G, L R M. Design models of trommels for resource recovery processing[J]. Resources&Conservation,1981, 6(3/4):223-240.
[11] B B, T R, G D, et al. Screening efficiency and rolling effects of a rotating screen drum used to process wet soft agglomerates[J]. Journal of Food Engineering,2017, 195:235-246.
[12] Zhang L,Xue D,Ma S, et al. Reserch on impurities of the cropstrawand trommel sieve[J]. Taiyangneng Xuebao/acta Energiae Solaris Sinica,2014, 35(3):433-438.
[13] Cundall P A,Strack O D L. A discrete numerical model for granular assemblies[J]. Gèotechnique, 1979,1(29):47-65.
[14] Wang D, Servin M, Mickelsson K O. Outlet design optimization based on large-scale nonsmooth DEM simulation[J]. Powder Technology,2014, 253:438-443.
[15] Sinnott M D, Cleary P W, Morrison R D. Combined DEM and SPH simulation of overflow ball mill discharge and trommel flow[J]. Minerals Engineering,2017, 108:93-108.
[16]胡国明.颗粒系统的离散元素法分析仿真[M].武汉:武汉大学出版社, 2010.
[17] Li H, Qian Y, Cao P, et al. Calculation method of surface shape feature of rice seed based on point cloud[J].Computers and Electronics in Agriculture,2017, 142:416-423.
[18]解元玉.基于ANSYS Workbench的流固耦合计算研究及工程应用[D].太原:太原理工大学, 2011.
[19] Li H, Li Y, Gao F, et al. CFD-DEM simulation of material motion in air-and-screen cleaning device[J]. Computers and Electronics in Agriculture,2012, 88:111-119.
[20]原建博,吴崇友,李骅,等.我国南方两种水稻脱出物物理特性测定与分析[J].农机化研究,2018(2):154-159.
[21]乔振先.水稻籽粒材料力学特性研究[J].江西农业大学学报,1992(1):1-9.