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为了探索新型清晰切割分级方法,本文以Stairmand型旋风分离器为对象进行了窄进料分级性能的模拟与实验研究。模拟软件采用FLUENT6.2,气相流场选用k-εRealizable模型,颗粒相采用随机轨道模型。实验设备直径0.1 m,进口风速10 m/s,颗粒粒径在0.1μm～36μm之间。模拟与实验结果表明:与全进料相比,窄进料能够得到更高的分级效率与更好的分级精度,但提高不大。颗粒轨迹模拟结果表明,这种情况是由旋风分离器本身固有的“短路流”与“下灰环”夹带造成。
In order to explore a new clear cutting classification method, this paper, Stairmand-type cyclone as the object of a narrow feed classification performance simulation and experimental study. The simulation software used FLUENT6.2, the k-εRealizable model for the gas-phase flow field, and the random orbit model for the grain phase. Experimental equipment diameter of 0.1 m, import wind speed 10 m / s, particle size between 0.1μm ~ 36μm. Simulation and experimental results show that, compared with the whole feed, narrow feed can get higher classification efficiency and better classification accuracy, but little improvement. Particle trajectory simulation results show that this situation is caused by the inherent “short-circuit flow” and entrainment of the “gray ring” of the cyclone itself.