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为了探明涡流空气分级机内流场的特性,在分级机的转笼外缘对称安装平行竖杆,利用FLUENT软件对安装不同数量平行竖杆的分级机的环形区三维流场进行数值模拟。研究结果表明:安装平行竖杆可以提高环形区的湍流耗散率,有利于粉体在环形区的分散;分别增加2、4、6、12根平行竖杆,可以使转笼外外柱面气流的切向、径向速度更加均匀,轴向速度减小,且惯性反旋涡现象减弱,从而提高分级精度;与其他数量平行竖杆的分级机相比,对称增加2根平行竖杆分级粒径较小。涡流空气分级机转笼外缘安装平行竖杆的流场模拟分析结果与已有的物料试验相符,安装平行竖杆的分级机具有性能优良且结构简单的特点。
In order to find out the characteristics of the flow field in the vortex air classifier, a parallel vertical rod was installed symmetrically on the outer edge of the cage of the classifier, and the three-dimensional flow field in the annular zone of the classifier with different numbers of parallel vertical rods was simulated by using FLUENT software. The results show that the installation of parallel vertical rods can increase the turbulence dissipation rate in the annular zone and facilitate the dispersion of the powder in the annular zone. Adding 2, 4, 6, 12 parallel vertical rods can make the outer cylinder Airflow tangential, more uniform radial velocity, axial velocity decreases, and Inertial anti-vortex phenomenon weakened, thereby improving classification accuracy; compared with the other number of parallel vertical rod classifier, the symmetrical increase of two parallel vertical rod grading Small diameter. The simulation results of the flow field of parallel vanes mounted on the outer periphery of vortex air classifier cage are in accordance with the existing material tests. The classifier with parallel vertical rods has the characteristics of excellent performance and simple structure.