关键词: 水稻侧深施肥, 气吹式, 三通管, 气固两相流, 仿真分析

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