秸秆微粉碎刀具结构设计与粉碎性能数值模拟
Structure design and pulverizing performance numerical simulation of straw micro-pulverizing cutter
付敏 1高泽飞 1陈效庆 1王成梦 1战明宇 1曹众1
作者信息
- 1. 东北林业大学 机电工程学院,黑龙江 哈尔滨 150040
- 折叠
摘要
为提高秸秆微粉碎的碎裂率以及粒度均匀性和稳定性,文章针对秸秆物性提出了动、定刀冲击和剪切的复合粉碎方式,设计了一种弧形锯齿刃粉碎刀具.通过对秸秆粉碎过程中受到的剪切、冲击作用进行力学和动力学分析,明确了影响秸秆粉碎性能的主要因素及碎裂方式.基于EDEM数值模拟,对比分析了锯齿刃型和光刃型刀具对秸秆粉碎性能的影响,模拟结果表明:在粉碎含水率为 20%的玉米秸秆时,相较于光刃型刀具,锯齿刃型刀具的颗粒粘结键数量减少了 16.76%、颗粒运动速度提高了15.9%、颗粒总能量增大了 25.05%、对粉碎室壁的冲击力减小了 33.69%,工作状态更加平稳,能耗更低.
Abstract
To improve the fragmentation rate,particle size uniformity,and stability of straw micro-pulverization,a composite pulverizing method of moving and fixed cutter impact shear was proposed for the physical properties of straw,and a curved serrated blade pulverizing cutter was designed.The main factors affecting the pulverizing performance of straw and the way of fragmentation were clarified through the analysis of the shear mechanics of straw,the analysis of impact dynamics,and the mechanical analysis of pulverizing moving cutter.Based on EDEM numerical simulation,the effects of the serrated blade and smooth blade cutters on the pulverizing performance of straw were compared and analyzed.The simulation results show that when pulverizing corn straw with a moisture content of 20%,the number of connective keys of the serrated blade is 16.76%less than that of the smooth blade,the particle motion speed is increased by 15.9%,the total energy of particles is increased by 25.05%,and the impact force on the pulverizing chamber wall is reduced by 33.69%,and has a smoother working condition and lower energy consumption.
关键词
秸秆/微粉碎/刀具/粉碎性能/数值模拟Key words
straw/micro-pulverization/cutter/pulverizing performance/numerical simulation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据