水稻芽种窝眼窄缝式气吸滚筒排种器流场模拟与试验  

Flow Field Numerical Simulation of Suction Cylinder-seeder for Rice Bud Seed with Socket-slot

作　　者：左彦军[1] 马旭[1] 玉大略 廖醒龙[1] 

机构地区：[1]华南农业大学工程学院,广州510642 [2]至卓飞高线路板深圳有限公司,深圳518067

出　　处：《农业机械学报》2011年第2期58-62,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(50775078);"十一五"国家科技支撑计划资助项目(2006BAD11A05-4);现代农业产业技术体系建设专项资金资助项目(农科教发[2007]14号);广东省高等学校人才引进科研资助项目(粤教师[2008]86号)

摘　　要：利用Fluent软件,采用三维、不可压、黏性、RNG湍流模型和SIMPLE数值计算方法,对不同窝眼的气吸滚筒流场进行模拟。模拟结果表明:滚筒在相对压力-4 kPa、生产率350盘/h、窝眼行距23 mm和孔间距31.4 mm时,滚筒内部压力分布均匀,速度稳定,能量损失主要集中在窄缝和出口附近,窝眼窄缝间气流相互影响甚微,说明窝眼在滚筒轴向和周向上分布合理。通过对比不同窝眼滚筒的平均湍动能、窄缝出口的平均压力和最大速度差可知,半球型滚筒窝眼更为合适。试验结果表明:半球型窝眼的播种合格率最高,达85.34%,与模拟结果一致。A 3-D,incompressible,viscous,RNG turbulence model and the SIMPLE method were used with computational fluid dynamics（CFD）,and flow fields of suction cylinder-seeder with different sockets were simulated by Fluent.When under pressure was-4 kPa,productivity was 350 trays per hour,row spacing of sockets was 23 mm and pitch of holes was 31.4 mm,the pressure was uniform,the velocity was stable.Energy loss mainly occured nearby slots and export,and there was almost no interaction among sockets-slots,which indicated that sockets of cylinder-seeder were distributed reasonably in axial and circumference.The hemispherical socket was more appropriate by contrasting different sockets on average turbulent kinetic energy,average vacuum and maximum velocity difference in side of slots.The experimental results showed that hemispherical socket had the best seeding performance（85.34%） which was consistent with simulant results.

关 键 词：水稻芽种 窝眼窄缝 气吸滚筒 流场 数值模拟 

分 类 号：S223.25[农业科学—农业机械化工程]