The Effect of Cyclone Height on Flow Field and Separation Performance

Abstract

The effect of cyclone height on the separation efficiency and the inner flow field was investigated. It is shown that the ratio of cone and cylinder height only has limited effect on the change law of cyclone performance when the cyclone height is increased. The efficiency increases firstly, while becomes poor when the height exceeds a certain value. In view of the flow characteristics of a cyclone, the reduction in efficiency is related to the effect of vortex end. With increasing cyclone height, the particle residence time becomes longer and leads to higher separation probability. However, at a certain cyclone height, the vortex end enters into the cone, and severe particle back-mixing occurs, resulting in the reduction in efficiency. Thus, the design of optimal cyclone height must consider the vortex length.