基于有限元方法的采棉机集棉筒气流场分析与优化

Analysis and Optimization of Airflow Field in Cotton Collecting of Cotton Picker Based on Finite Element Method

这里针对垂直摘锭式采棉机采摘头集棉筒堵塞问题,引用Fluent软件和风洞实验平台,对集棉筒结构和工作参数进行了改进。首先,改变集棉筒入口几何尺寸,建立了几种优化模型,并进行了仿真分析,仿真结果表明,改变入口几何尺寸是不能够避免集棉筒堵塞问题;其次,改进集棉筒边界条件,并在仿真过程对集棉筒底部施加了正压速度入口,仿真结果表明,改变集棉筒边界条件是解决其堵塞问题的最佳手段;最后,建立了风洞实验台,制作了集棉筒实物,并实际测试了集棉筒内部气流场速度值,再将实验数据与仿真数据相对比,验证了仿真结果的可靠性;这里对采棉机气力输送系统的设计与优化提供了科学的依据。

Aiming at the clogging problem of cotton collecting.It uses the Fluent software and the wind tunnel experiment platform,as the simulation software and experiment platform to improve the cotton collecting structure and working parameters.Firstly,under the condition of improving the geometric size of the cotton collecting entrance,several optimization models were established,and the flow field analysis was carried out.The simulation results showed that the clogging problem of the cotton collecting could not be avoided by changing the inlet geometrical size;secondly,improving the cotton collecting Boundary conditions,and a positive pressure velocity is applied to the bottom of the cotton collecting.The simulation results show that changing the boundary conditions of the cotton collecting is the best way to solve the clogging problem.Finally,the actual cotton collecting of the wind tunnel experiment platform was established and tested.The airflow velocity values inside the cotton collecting at different heights,and comparing the experimental data with the simulation data,verify the reliability of the simulation analysis results;It provides a scientific reference for the design and optimization of the pneumatic conveying system of the cottonpicker.