藜麦脱出物空气动力学特性测试与分析

Test and Analysis of Aerodynamics on the Quinoa Threshed Mixture

藜麦被联合国粮农组织(FAO)列为全球十大全营养食品之一。目前,但其机械收获中因缺少专用机具,收获的毛粮杂质较多,且国内藜麦联合收获机的清选效果还不够理想,存在着清选不彻底、含杂率高等问题。藜麦脱出物主要由茎秆类、带壳藜麦、藜麦、带壳瘪谷及瘪谷等组成,各自的物料特性存在差异。为此,对藜麦脱出物的空气动力学特性进行试验测定,得到藜麦脱出物长秸秆、短秸秆、带壳藜麦、藜麦、带壳瘪谷、瘪谷和颖壳的悬浮速度变化范围。同时,在清选试验台上选取一定范围的风机转速、出风口角度、抖动板抖动次数及喂入量,以藜麦含杂率、损失率为评价指标,得到了影响清选效果的因素水平,为藜麦联合收获机风选部件参数选择提供了依据。

Quinoa has been classified as one of the top ten nutritious food in the world by the FAO. Due to the lack of special mechanical harvest equipment. The harvested raw grain impurity account for a large part. At present, the effect of domestic quinoa combine harvester is not ideal. There exist that the separation is not complete and the impurity rate is high. Quinoa is mainly composed of the stalk, quinoa in the husk, quinoa, shriveled quinoa, shriveled in the husk and soil etc. There are differences between their material properties. Therefore the aerodynamic characteristics of the separates of quinoa are studied to get the range of suspending speed of the stalk, quinoa in the husk, quinoa, shriveled quinoa and the glume. And then selecting a certain range of fan speed, outlet angle, jitter frequency of jitter board and feed volume, taking quinoa miscellaneous rate, loss rate as the evaluation index. Find out the mainly factors that affect the selection level. Provide the basis for the selection of parameters of the quinoa combined harvester.