导叶式旋风管排尘口处颗粒返混夹带现象

通过数值模拟的方法，研究导叶式旋风管内颗粒返混夹带现象。研究表明，排尘口下方存在明显的灰斗返混现象，颗粒返混质量流率占入口颗粒质量流率的38%，排尘锥内部颗粒返混夹带量占入口颗粒流率的47%；排尘口上方1.1D(D为旋风管直径)范围是主要的二次分离空间，最终影响分离效率的返混颗粒仅占入口颗粒质量流率的2.5%；13 μm以下的返混颗粒会对分离器总效率产生影响，粒径越小，影响作用越明显。

Back mixing of particles in guide vane separator

The CFD method was employed to simulate the back mixing of particles in a guide vane separator based on the Reynolds stress model (RSM)and the discrete particle model (DPM).The results show that the back mixing of particles is serious at the bottom of the dust discharge, which contains 38% of the total mass of particles.The mass flow rate of back mixing of particles in the dust discharge is 47% of the total mass flow rate.The back mixing of particles decreases sharply at 1.1D above the dust discharge, where D is the diameter of cyclone.The particle back mixing that affects cyclone efficiency is only 2.5% of total inlet mass flow rate of particles.The particles smaller than 13 μm affect the total efficiency.Smaller particles result in more significant influence.