气吸滚筒式棉花精密排种器流场分析
|
摘要
为分析气吸滚筒式精密排种器充种性能的影响因素和负压腔流场分布规律,建立了充种过程种子在气流场中的力学模型,利用Gambit软件建立滚筒负压腔仿真简化模型,运用Fluent软件对影响充种性能的吸孔形状、吸孔直径及滚筒负压腔流场分布进行了数值模拟。采用正交试验的方法设计试验方案,研究滚筒转速、吸孔直径及气室负压对排种性能指标的影响,结果表明:滚筒转速为12r/min、吸孔直径为3.5mm、气室负压为4.8k Pa时,排种效果最佳,合格指数为9 3%,漏播指数为2%,重播指数为5%,满足棉花种植农艺要求。
In order to study the factors on seed suction performance of the pneumatic cylinder array precision seed-metering device for cotton and airflow in cylinder cavities of the cylinder seed-metering device. The working principle and component of precision seeder were introduced,and the mechanical model of single cotton seed during the air-suction filling process was established in this paper. Simplified model of air flow channel in cylinder cavities was built and be generated with grids using Gambit,the straight nozzle,taper nozzle,sink nozzle,cylinder cavities were simulated and analyzed. Orthogonal test is used to design the test,the cylinder speed,hole diameter and vacuum pressure on the performance indices were analyzed. the results showed that the cylinder speed was 12 r/min,the hole diameter was 3. 5 mm,and vacuum pressure was 4. 8 k Pa. Under the condition of the optimal combination parameters,the quality of feed index,miss index and multiple index were 93 %,2% and 5%,respectively.
In order to study the factors on seed suction performance of the pneumatic cylinder array precision seed-metering device for cotton and airflow in cylinder cavities of the cylinder seed-metering device. The working principle and component of precision seeder were introduced,and the mechanical model of single cotton seed during the air-suction filling process was established in this paper. Simplified model of air flow channel in cylinder cavities was built and be generated with grids using Gambit,the straight nozzle,taper nozzle,sink nozzle,cylinder cavities were simulated and analyzed. Orthogonal test is used to design the test,the cylinder speed,hole diameter and vacuum pressure on the performance indices were analyzed. the results showed that the cylinder speed was 12 r/min,the hole diameter was 3. 5 mm,and vacuum pressure was 4. 8 k Pa. Under the condition of the optimal combination parameters,the quality of feed index,miss index and multiple index were 93 %,2% and 5%,respectively.
引文
[1]国家统计局.国家统计局关于2016年棉花产量的公告[EB/OL].[2016-12-20].http://www.stats.gov.cn/tjsj/zxfb/201612/t20161220_1443527.html.
[2]许剑平,谢宇峰,陈宝昌.国外气力式精密播种机技术现状及发展趋势[J].农机化研究,2008(12):203-206.
[3]杨丽,颜丙新,张东兴,等.玉米精密播种技术研究进展[J].农业机械学报,2016,47(11):38-48.
[4]廖庆喜,雷小龙,廖宜涛,等.油菜精量播种技术研究进展[J].农业机械学报,2017(9):1-16.
[5]袁月明,马旭,金汉学,等.气吸式水稻芽种排种器气室流场研究[J].农业机械学报,2005,36(6):42-44.
[6]廖庆喜,李继波,覃国良.气力式油菜精量排种器气流场仿真分析[J].农业机械学报,2009,40(7):78-82.
[7]王朝辉,袁月明,马旭,等.超级稻育秧精密播种器内部流场的数值模拟[J].吉林农业大学学报,2009,31(6):781-784.
[8]赵湛.气吸振动式精密排种器理论及试验研究[D].镇江:江苏大学,2009.
[9]陈进,李耀明,王希强,等.气吸式排种器吸孔气流场的有限元分析[J].农业机械学报,2007,38(9):59-62.
[10]王福军.计算流体动力学分析—CFD软件原理与应用[M].北京:清华大学出版社,2004.
[11]高筱钧,周金华,赖庆辉.中草药三七气吸滚筒式精密排种器的设计与试验[J].农业工程学报,2016(2):20-28.
[12]国家质量监督检验检疫总局.GB/T6973-2005单粒(精密)播种机试验方法[S].北京:中国标准出版社,2006.
[2]许剑平,谢宇峰,陈宝昌.国外气力式精密播种机技术现状及发展趋势[J].农机化研究,2008(12):203-206.
[3]杨丽,颜丙新,张东兴,等.玉米精密播种技术研究进展[J].农业机械学报,2016,47(11):38-48.
[4]廖庆喜,雷小龙,廖宜涛,等.油菜精量播种技术研究进展[J].农业机械学报,2017(9):1-16.
[5]袁月明,马旭,金汉学,等.气吸式水稻芽种排种器气室流场研究[J].农业机械学报,2005,36(6):42-44.
[6]廖庆喜,李继波,覃国良.气力式油菜精量排种器气流场仿真分析[J].农业机械学报,2009,40(7):78-82.
[7]王朝辉,袁月明,马旭,等.超级稻育秧精密播种器内部流场的数值模拟[J].吉林农业大学学报,2009,31(6):781-784.
[8]赵湛.气吸振动式精密排种器理论及试验研究[D].镇江:江苏大学,2009.
[9]陈进,李耀明,王希强,等.气吸式排种器吸孔气流场的有限元分析[J].农业机械学报,2007,38(9):59-62.
[10]王福军.计算流体动力学分析—CFD软件原理与应用[M].北京:清华大学出版社,2004.
[11]高筱钧,周金华,赖庆辉.中草药三七气吸滚筒式精密排种器的设计与试验[J].农业工程学报,2016(2):20-28.
[12]国家质量监督检验检疫总局.GB/T6973-2005单粒(精密)播种机试验方法[S].北京:中国标准出版社,2006.