基于EDEM-Fluent耦合胡麻清选装置过程模拟分析

针对胡麻分离清选过程高损失率、高含杂率问题，设计了风筛式胡麻清选装置。利用EDEM-Fluent耦合方法，对胡麻清选装置清选过程进行仿真分析，探究清选装置作业参数对胡麻籽粒含杂率和清选损失率的影响规律，确定最优的组合参数。基于清选装置气流场胡麻脱粒物料的运动分析，建立了胡麻清选装置简化模型；对风机风速、气流倾角、清选筛振动频率和振幅4个参数进行单因素试验和正交试验。结果表明，风机风速、气流倾角、清选筛振动频率和振幅是影响清选装置清选性能的显著因素。应用Design-Expert软件建立了籽粒含杂率和清选损失率的数学回归模型，获得最佳工作参数组合:风机风速4.5 m/s、气流倾角4°、清选筛频率6 Hz、清选筛振幅9 mm，最优工作参数组合下胡麻籽粒含杂率为2.97%，清选损失率为2.39%。该研究结果可为胡麻清选装置的设计和优化提供参考。 

Process Simulation and Analysis of Flax Cleaning Device Based on EDEM-Fluent Coupling

In order to solve problems of high loss rate and high impurity content in flax cleaning process，a wind screen flax cleaning device was designed.With coupling method of EDEM-Fluent，cleaning process of flax cleaning device was simulated and analyzed，influence law of cleaning device operating parameters on flax seed impurity content and cleaning loss rate was explored，and optimal combination parameters were determined.Based on movement analysis of flax threshing material in airflow field of cleaning device，a simplified model of flax cleaning device was established.Single factor test and orthogonal test were carried out for four parameters of fan wind speed，air flow inclination，vibration frequency and amplitude of cleaning screen.Results showed that fan wind speed，air flow inclination，vibration frequency and amplitude of cleaning screen were significant factors affecting cleaning performance of cleaning device.Mathematical regression model of seed impurity content and cleaning loss rate was established by using Design-Expert software.Optimal working parameter combination was obtained:fan wind speed 4.5 m/s，air flow inclination 4°，cleaning screen frequency 6 Hz，cleaning screen amplitude 9 mm.Under optimal working parameter combination，seed impurity content of flax was 2.97%，and cleaning loss rate was 2.39%.Research results could provide reference for design and optimization of flax cleaning device.