Chinese Journal OF Rice Science >
Design and Optimization of a Terminal Shunting Acceleration Device for Rice Side Deep Fertilization
Received date: 2025-02-25
Revised date: 2025-04-22
Online published: 2025-07-21
【Objective】 Addressing the slow fertilizer falling speed and susceptibility to clogging at the fertilizer tube outlet in rice side-deep fertilization devices, 【Method】 a terminal shunt-type acceleration device was developed based on the physical properties of universal granular compound fertilizers. Utilizing the gas-solid two-phase flow theory, the device separates the air stream and fertilizer particles. The diverted air stream is accelerated through a variable-diameter tube and then reintroduced at the fertilizer outlet, thereby increasing the outlet air velocity to accelerate fertilizer descent and prevent blockages. 【Result】 A coupled Computational Fluid Dynamics (CFD) and Discrete Element Method (DEM) simulation model was established. The inclination angle of the mixing tube, the bend-to-diameter ratio, and the inclination angle of the air induction port in the air-fertilizer shunting device were selected as influencing factors. Using the fertilizer misentry rate into the air induction port and the air flow velocity as response variables, a Box-Behnken experimental design (a three-factor, three-level response surface methodology) was employed to conduct simulation experiments and identify the optimal structural parameters. The results indicate that the optimal structural parameter combination is a mixing tube inclination angle of 10°, an air induction tube inclination angle of 16°, and a bend-to-diameter ratio of 2. Bench tests conducted under these optimal conditions yielded an average accelerated air velocity of 19.74 m/s, a fertilizer misentry rate of 7.74%, and an average fertilizer falling velocity of 2.14 m/s. 【Conclusion】 This device effectively enhances the air velocity at the fertilizer tube outlet and the fertilizer falling speed, providing a valuable reference for research into pneumatic rice fertilization technology.
LIN Yi, SUN Liang, CHEN Dongshun, ZHU Guangfei, KONG Ziyang, YU Gaohong . Design and Optimization of a Terminal Shunting Acceleration Device for Rice Side Deep Fertilization[J]. Chinese Journal OF Rice Science, 2025 , 39(4) : 451 -464 . DOI: 10.16819/j.1001-7216.2025.250209
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