中国水稻科学2025，Vol.39Issue(4)：451-464,14.DOI:10.16819/j.1001-7216.2025.250209
水田侧深施肥末端分流式加速装置的设计与优化
Design and Optimization of a Terminal Shunting Acceleration Device for Rice Side Deep Fertilization
摘要
Abstract
[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.关键词
颗粒肥/气肥分流/流固耦合/气流加速/侧深施肥Key words
granular fertilizer/gas and fertilizer distribution/fluid-structure coupling/acceleration of air flow/side deep fertilization引用本文复制引用
林逸,孙良,陈东顺,朱广飞,孔子阳,俞高红..水田侧深施肥末端分流式加速装置的设计与优化[J].中国水稻科学,2025,39(4):451-464,14.基金项目
国家重点研发计划资助项目(2022YFD2001802) （2022YFD2001802）
国家自然科学基金资助项目(52375275) （52375275）
浙江省科技计划资助项目(2022C02034). （2022C02034）
