涡流空气分级机圆弧形叶片转笼的设计

发布时间：2018-03-28 09:01

本文选题：涡流空气分级机　切入点：转笼　出处：《机械工程学报》2016年02期

【摘要】：涡流空气分级机分级粒径主要受转笼转速与入口风速匹配关系的影响。入口风速一定时,转笼转速越高,分级粒径越小,但这会造成流场速度分布不均匀,而降低分级精度。利用Fluent软件对具有直叶片转笼结构的涡流空气分级机进行建模和数值模拟,分析转笼内流场特性,针对其流场不均匀及转笼入口冲角大等现象,对转笼叶片的形状及安装角进行改进,提出一种圆弧形叶片转笼的设计方法。通过数值模拟及物料试验对改进结果进行验证,数值模拟结果表明:圆弧形叶片转笼入口冲角减小,流道内流场更加均匀,分级粒径减小。碳酸钙分级试验结果与数值模拟结果吻合:设计工况即入口风速为12 m/s,转笼转速为1 200 r/min时,采用设计的圆弧形叶片转笼在保持分级精度不变的情况下,分级粒径减小了11.5%。
[Abstract]:The particle size of the swirl air classifier is mainly affected by the matching relationship between the rotating cage speed and the inlet wind speed. The higher the inlet velocity is, the smaller the particle size is, but this will result in uneven velocity distribution in the flow field. In order to reduce the classification accuracy, the Fluent software is used to model and simulate the swirl air classifier with straight vane cage structure. The characteristics of the flow field in the cage are analyzed, and the phenomena such as uneven flow field and large angle of incidence at the inlet of the cage are analyzed. The shape and installation angle of the rotor blade are improved, and a design method of the circular arc blade rotating cage is proposed. The improved results are verified by numerical simulation and material test. The numerical simulation results show that the angle of incidence at the inlet of the circular arc blade is reduced, and the flow field in the channel is more uniform. The particle size is reduced. The results of calcium carbonate grading test are in good agreement with the numerical simulation results. When the inlet wind speed is 12 m / s and the rotating speed is 1 200 r/min, the designed circular arc blade rotary cage can keep the classification accuracy unchanged. The particle size decreased by 11.5%.
【作者单位】：北京化工大学机电工程学院;北京化工大学材料电化学过程与技术北京市重点实验室;
【基金】：国家自然科学基金青年基金资助项目(51204009)
【分类号】：TQ051.8

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