旋风除尘器内部流场的数值研究

Numerical study of flow field in a cyclone

通过建立旋风除尘器模型,模拟了排气管插入深度对旋风除尘器的压降、气流的切向速度和轴向速度的影响。研究表明,增加排气管的插入深度会增大旋风除尘器的压力损失,但对其内部压力分布的影响却比较小;增加排气管的插入深度对气体切向速度和轴向速度的影响也比较小,在不同高度上,内外旋流交界处切向速度的最大值都有所增加,这会产生更大的离心力,除尘效率也会因此而提高。

By building the model of a cyclone separator,this paper simulated the effects of vortex finder depth on pressure drop of the cyclone, tangential velocity and axial velocity of gas flow. Results show that increasing vortex finder depth will increase pressure drop of the cyclone but have little effect on internal pressure distribution. Increasing vortex finder depth will also have little effect on tangential velocity and axial velocity of gas flow. At different heights, the maximum value of tangential velocity in the interface between internal rotational flow and external rotational flow is increased, which will lead to larger centrifugal force, so the collection efficiency will be increased too.