In order to solve the problem of narrow spraying machinery operating range and low efficiency in planting orchard. A ring-type dual channel fan was designed to adapt the compact planting orchards. Based on agronomic characteristics, the fan's structure and the key components were determined using the fluid dynamics and application techniques. The type of fan's structure was R+S with 9 blades and 11 guide blades. The radius of road corner was 155 mm and deflector corner was 87.55 mm. The power, air volume, wind speed, air pressure and wind distribution were measured in different conditions and the performance curve was drawn. The results showed that the fan's performance met the design requirements with efficiency value of 75% or more and the optimal operating width of 5 m at the speed of fan's l400r/min.%为了解决低矮密植型果园施药机械作业范围窄、作业效率低的问题,该文设计了一种轴向进风、径向出风的圆环双流道风机,根据农艺特征,结合流体力学和施药技术,完成风机结构设计和各关键部件技术参数的确定.风机结构为R+S级型式,叶片数为9,后导轮叶片数为11.风道弯角半径为155 mm,导流板弯角半径为87.55 mm.对风机不同转速下的功率、风量、风速、风压、风场分布进行了测试,绘制了风机的性能曲线图.试验结果表明,该风机各项性能参数满足设计要求,效率值可以达到75％以上,风机转速在1 400 r/min时的最佳作业幅宽为5m.
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