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【目的】设计并研制能够适应不同品种的气动-机械复合式玉米精量排种器，解决玉米种子损伤率高、播种精度不足等问题。【方法】以中国主栽玉米品种仙玉335、郑单958和京科968为研究对象，首先通过运动学分析揭示了装置的充种、清种与投种过程机制，然后采用离散元-计算流体力学(DEM-CFD)耦合仿真方法，系统探究装置内部流场特性与工作性能的相互作用机制。【结果】仿真优化结果表明，当吸种孔直径为4 mm、排种盘角速度为4.19 r·s-1、流场负压为3.5 kPa时，装置性能达到最优。为验证这一结果，进行台架试验分析，结果表明，作业速度区间为5～7 km·h-1，流场压力区间为-3～-4 kPa时，排种合格指数均高于92.2%，漏播指数均低于3.89%，重播指数均低于4.42%。【结论】研究验证基于DEM-CFD耦合的复合式玉米精量排种器可显著提升玉米种子的播种精度与作业稳定性，为复合式玉米精量排种器的结构优化提供了理论依据。
Abstract：【Objective】To address issues of high corn seed damage rates and insufficient seeding accuracy， this study developed a pneumatic-mechanical compound precision corn seed metering device. 【Method】Taking China's main maize varieties Xianyu 335， Zhengdan 958 and Jingke 968 as the research objects， the mechanism of the device's seed filling， seed clearing and seed casting process was firstly revealed through kinematic analysis， and then the interaction mechanism between the device's internal flow field characteristics and its performance was systematically investigated by using the coupled discrete element-computational fluid dynamics (DEM-CFD) simulation method. 【Result】Simulation optimization showed that the device achieved optimal performance with a suction hole diameter of 4 mm， seed disk angular velocity of 4.19 r·s-1， and negative pressure of 3.5 kPa. To verify this result， bench test analysis was carried out， and the test results showed that: when the operating speed interval was 5～7 km·h-1， and the flow field pressure interval was -3～-4 kPa， the qualified index was higher than 92.2%， the miss index was lower than 3.89%， and the multiple index was lower than 4.42%. 【Conclusion】The study confirms that a compound precision corn seed metering device based on DEM-CFD coupling significantly improves the sowing accuracy and operational stability of corn seeds， providing a theoretical basis for the structural optimization of compound precision seed metering devices.
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基本信息:
DOI：10.16445/j.cnki.1000-2340.20260827.002
中图分类号:S223.2
引用信息:
[1]毛若楠,赵佳辉,邵龙,等.基于DEM-CFD耦合的复合式玉米精量排种器的设计与试验[J].河南农业大学学报().DOI:10.16445/j.cnki.1000-2340.20260827.002.
基金信息:
河南省科技攻关项目（242102111183）; 河南省重点研发专项（241111111300）; 河南省重点研发与推广专项（262102111173）
2026-08-27
2026-08-27
2026-08-27