Abstract: In order to explore the influence of different structural characteristics of the threeway pipe of the airblown side deep fertilization device on the movement of air flow and fertilizer particles, the atype threeway pipe perpendicular to the axis of the air flow inlet and outlet, the btype threeway pipe with a 45° angle between the axis of the air flow inlet and outlet, and the ctype threeway pipe with the air flow inlet and outlet coaxial are designed through theoretical analysis. Under the conditions that the inner diameter of the tee pipe is 28 mm, the inlet air velocity is 16.4 m/s and the flow rate of fertilizer particles is 20 g/s, the CFDEDM coupling method is used to simulate and analyze the flow, pressure and particle motion state in different pipes. The results showed that the air flow through the three types of tee pipes a, b and c produced different flow effects, and then affected the movement characteristics of fertilizer particles. The maximum movement velocity of particles was 1.99 m/s, 2.94 m/s and 2.07 m/s, respectively, and the maximum impact force of particles was 0.05 N, 0.13 N and 0.34 N, respectively. Through the verification test, the comparison showed that the variation coefficient of fertilizer discharge stability was 0.81 and the fertilizer breakage rate was 0.72% with the btube side deep fertilization device, there was no fertilizer blockage in the fertilization process.

Key words: rice sidedeep fertilization, airblown, threeway pipe, gassolid twophase flow, simulated analysis

摘要： 为探究气吹式侧深施肥装置三通管不同结构特征对气流和肥料颗粒运动的影响，通过理论分析，设计气流入口与出口轴线垂直的a型三通管、气流入口与出口轴线呈45°夹角的b型三通管、气流入口与出口同轴的c型三通管。在三通管内径为28 mm、通入气流速度为16.4m/s、肥料颗粒流量为20 g/s的条件下，采用CFDEDM耦合方式对不同管道内气流、压力、颗粒运动状态进行仿真分析。结果表明：气流经a、b、c三种类型三通管产生不同的流动效果，进而影响肥料颗粒运动特性，颗粒最大运动速度分别为1.99 m/s、2.94 m/s、2.07 m/s，期间颗粒产生最大碰撞力分别为0.05 N、0.13 N、0.34 N。通过验证试验对比表明，采用b型管侧深施肥装置排肥稳定性变异系数为0.81，肥料破损率为0.72%，施肥过程中无肥料堵塞。

关键词: 水稻侧深施肥, 气吹式, 三通管, 气固两相流, 仿真分析