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当前位置: 首页 > 文章 > 纵轴流清选装置混合流场数值模拟与优化试验 农业机械学报 2016,47 (7) 135-142
Position: Home > Articles > Numerical Simulation and Optimization Experiment of Mixed Flow Field on Longitudinal Axial Flow Cleaning Device Transactions of the Chinese Society for Agricultural Machinery 2016,47 (7) 135-142

纵轴流清选装置混合流场数值模拟与优化试验

作  者：
童水光;沈强;唐宁;贾亚萍;从飞云;顾伟
单  位：
浙江大学机械工程学院;星光农机股份有限公司
关键词：
联合收获机;清选装置;混合流场;计算流体动力学;数值模拟
摘  要：
清选装置性能决定着收获机的作业性能,为了克服纵轴流全喂入风筛式清选装置单风道离心风机气流场不均匀的缺点,对风机、脱粒滚筒产生的混合流场进行三维数值模拟,提出纵轴流全喂入双风道六出风口风机的改进结构,并分析结构改进后振动筛面的气流速度对全流域气流分配的影响。同时,对改进后清选装置进行风机转速、风机入射倾角、鱼鳞筛夹角3因素正交优化,分析了各因素对气流场的影响规律,得到最优参数组合:当风机入射倾角30°、鱼鳞筛夹角40°、风机转速1 900 r/min时,更利于高负荷高效率清选。最后,通过田间试验验证了双风道结构和优化试验的准确性,水稻籽粒损失率0.91%,含杂率0.87%,小麦籽粒损失率0.82%,含杂率0.76%。
译  名：
Numerical Simulation and Optimization Experiment of Mixed Flow Field on Longitudinal Axial Flow Cleaning Device
作  者：
Tong Shuiguang;Shen Qiang;Tang Ning;Jia Yaping;Cong Feiyun;Gu Wei;College of Mechanical Engineering,Zhejiang University;Star Agricultural Machinery Co.,Ltd.;
关键词：
combine harvester;;cleaning device;;mixed flow field;;computational fluid dynamics;;numerical simulation
摘  要：
The cleaning performance of cleaning device greatly affects the working performance of the machine. In order to overcome the shortcomings of the uneven air-flow field in the longitudinal axial flow full-feeding air-and-screen cleaning device,the mixed flow field produced by the fan and the threshing roller was numerically simulated with computational fluid dynamics( CFD) software. A structure of fan with double air-ducts and six air-outlets was proposed based on the longitudinal axial flow full-feeding cleaning device. By comparing and analyzing the improved structures,the air speed of the sieve has the influence on the distribution of the full air-flow field. At the same time,the orthogonal simulation was carried out on a new type of cleaning device with the three factors( the fan speed,the incident angle of the fan,the included angle of the sieve) in Z section,and the influence of the three factors was analyzed. The optimal combinations are as follows: the incident angle of the fan is 30°,the included angle of sieve is 40°,the speed of fan is 1 900 r / min. With the best combination of these structural parameters,the speed of overall air flow in the front and the rear of sieve is uniform and efficient,and it is more beneficial to high-load cleaning. Finally,field tests verified the accuracy of the improved structure and optimization program. The loss rate of the rice is 0. 91% and the impurity rate is 0. 87%.The loss rate of the wheat is 0. 82% and impurity rate is 0. 76%,it greatly improved the cleaning performance of the longitudinal axial flow.

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