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利用计算流体动力学软件FLUENT6.2.16对壁面粗糙度不同的旋风分离器内流场进行了数值模拟,得到了切向速度、轴向速度、径向速度和静压力分布规律。旋风分离器内的切向速度随着壁面粗糙度的增大而明显减小;轴向速度没有明显的规律性变化,只在上部筒体涡核区轴向速度增加,削弱了涡核区滞留现象;在流场大部分区域径向速度随粗糙度的增大而减小;外旋流区的静压力随着粗糙度的增大而明显减小。最后对壁面粗糙度降低旋风分离器压力损失和分离效率的机理进行了分析。
The flow field in a cyclone with different wall roughness was numerically simulated by computational fluid dynamics software FLUENT 6.2.16, and the tangential velocity, axial velocity, radial velocity and static pressure distribution were obtained. The tangential velocity in the cyclone significantly decreases with the increase of the roughness of the wall. There is no obvious regularity of the axial velocity. The axial velocity increases only in the vortex core region of the upper cylinder, which impairs the retention of vortex core region Phenomenon. The radial velocity decreases with the increase of roughness in most of the flow field. The static pressure in the outer swirling zone decreases with the increase of roughness. Finally, the mechanism of the wall roughness reducing the pressure loss and separation efficiency of the cyclone was analyzed.