采用Eulerian单相流体模型,模拟了 4种不同入料管结构的旋流器的物料运动过程.包括传统圆形入料口(R-1型,直径15 mm),方形入料口(R-2、R-3和R-4型,尺寸为7 mm ×7 mm、8 mm ×6 mm和9 mm ×5 mm).同时,选择R-2型进行试验验证.结果表明,在体积进料速率为0.266 kg/s的情况下,与圆形入料管道旋流器相比,方型构型具有更大的E(Eule)值和R(底流溢流比)值.同时CFD模拟结果轴向速度分布证明了更多的流体移到R-2型,采用方形进料管代替圆形进料管E值平均增加12.4％,R值平均增加7.6％,d50(切割粒度直径)平均减小32％,有助于提高分离器的分级效率.
Study on influence of inlet structure of cyclone on classification effect
The material movement of four kinds of hydro cyclone with different inlet tube structures was simulated by using Eulerian sin-gle phase fluid model.These include traditional round inlet(type R-1,diameter 15 mm)and square inlet(type R-2,R-3 and R-4,sizes 7 mm × 7 mm,8 mm × 6 mm and 9 mm × 5 mm).At the same time,R-2 type was selected for test verification.The results show that the square configuration has larger E(Eule)and R(bottom flow overflow ratio)values than the circular inlet pipe cyclone at a volumetric inlet rate of 0.266 kg/s.At the same time,the axial velocity distribution of CFD simulation results proved that more fluid moved to R-2 type,and the square inlet pipe instead of the round inlet pipe increased the value of E by 12.4％on average,the value of R by 7.6％on average,and the value of d50(cut particle size diameter)by 32％on average,which helped to improve the classification efficiency of the separator.
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