Position: Home > Articles > Influence of Combined Fan on Airflow Velocity Field of Apple Orchard Based on CFD
Journal of Agricultural Mechanization Research
2019
(10)
7-14
风扇组对气流速度场影响的CFD仿真及验证
作 者：
徐奕蒙;李守藏;刘志杰;张智韬;胡耀华
单 位：
西北农林科技大学机械与电子工程学院;农业部农业物联网重点实验室;陕西省农业信息感知与智能服务重点实验室;西北农林科技大学水利与建筑工程学院
关键词：
密植苹果园;气流速度场;CFD模拟;风扇组
摘 要：
针对密植苹果园农药喷施不均匀、药液难以进入冠层内部的问题,结合密植苹果园的种植特点,提出了一种组合风扇的风送式喷雾结构,并通过CFD模拟探究该组合风扇出风口速度和倾角对气流速度场的影响规律。结果表明:随着组合风扇入口气流速度的增大,风送距离随之增大,但气流场分布特性基本一致;随着上下位风扇倾角的增大,3个风扇的相互影响越来越明显,3个风扇气流场的交汇扩大了组合风扇气流场的作用范围,侧位风扇倾角越大,X轴正向气流速度越大且越容易穿入厚厚的冠层内部;在入口风速为9m/s时,上下位风扇最佳倾角为35°～50°,侧位风扇倾角可根据果园植株幅宽特性进行调整;舍去两端误差较大的采样点,各倾角下采样点的相对误差基本分布在11. 00%～30. 00%之间,标准差介于0. 50～7. 50之间,模拟值与实验值的符合性较好。在距风扇安装位置0. 5～1. 5m之间的垂面上,气流场分布总体趋势为:中部流速最大,由中部向两侧逐渐递减。
译 名：
Influence of Combined Fan on Airflow Velocity Field of Apple Orchard Based on CFD
作 者：
Xu Yimeng;Li Shoucang;Liu Zhijie;Zhang Zhitao;Hu Yaohua;Northwest A&F University College of Mechanical and Electronic Engineering;Northwest A&F University College of Water conservancy and Architectural Engineering;Key Laboratory of Agricultural Internet of Things,Ministry of Agriculture;Shaanxi Key Laboratory of Agricultural Information Perception and Intelligent Service;
单 位：
Xu Yimeng%Li Shoucang%Liu Zhijie%Zhang Zhitao%Hu Yaohua%Northwest A&F University College of Mechanical and Electronic Engineering%Northwest A&F University College of Water conservancy and Architectural Engineering%Key Laboratory of Agricultural Internet of Things,Ministry of Agriculture%Shaanxi Key Laboratory of Agricultural Information Perception and Intelligent Service
关键词：
close planting apple orchard;;air-velocity distribution field;;CFD simulation;;combined fan
摘 要：
The problems that the uneven spraying of pesticide and the canopy lacking pesticide were existed in close planting apple orchard. A new structure combined fan was presented. The influence of the velocity and inclination of the fan on the velocity field of the combined fan by CFD simulation base on the characteristics of close planting apple orchard. The results demonstrated that the airflow distance increases when the speed of the airflow velocity increased of the combined fan inlet,but inlet velocity has little effect on the distribution pattern. With the increase of the inclination angle of the upper and lower fans,the interaction of the three fans becomes more and more obvious. The greater the inclination of the lateral fan,the greater the forward speed of the X-axis is easier to penetrate into the thick canopy interior. At the inlet wind speed of 9 m/s,the optimum inclination angle of the upper and lower fans is 35°-50°,and the inclination of the lateral fan can be adjusted according to the width of the orchard. Avoiding the larger error at both ends of the sampling point,the relative error of the sampling points under the inclination is basically distributed between 11. 00%-30. 00%,and the standard deviation is between 0. 50-7. 5,the general trend of the distribution of airflow field is the largest in the middle of the fan,gradually decreasing from the middle to the sides at a distance of 0. 5-1. 5 m from the fan mounting position.
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