谷物清选装置研究现状及发展趋势

Research Advances and Prospects in Cleaning Device of Grain

在谷物机械化收获中,清选损失是构成机械化收获损失的主要部分。清选装置的结构等参数都对损失产生重要影响,对清选装置的研究有助于降低损失,提高机械化收获效率。为此,从3个方面叙述了当前的研究动态:清选气流场的研究多采用实验与CFD模拟相结合的方法,省时且高效;在对脱出物的运动研究中,借助了仿真手段对不同脱出物运动做了模拟研究;在结构参数方面,对风机、曲柄转速和曲柄半径等做了实验研究。然而,这些研究没考虑物料的清选气流场模拟,物料运动模拟模型过于单一,没有表达出真实的运动情况,结构参数多集中在振动筛和风机的研究方面。因此,通过对研究现状的分析,得出了当前在谷物清选装置研究的不足之处,并指出了其以后的发展趋势。

Cleaning loss is the main portion of the total loss at harvest in the grain harvest mechanization. Parameters of cleaning device have an important influence on loss, research on cleaning loss is helpful to reduce loss and increase the efficiency of crop. Describe current research trend in three aspects, by method of experiment and CFD research cleaning air flow field, research on the motion state of threshed material by means of the simulation, the fan, crank speed and crank radius, etc. Current research that cleaning air flow field simulation without considering the material did not reflect the true motion because of material motion simulation model is too single and structure parameters of sieve and fan. Through the analysis obtain deficiencies of research on cleaning device and analysis research prospects.