柱状旋流分离器旋转涡核边界分布特性

采用微分雷诺应力模型对柱状旋流分离器气体单相流场中的旋转涡核边界分布特性进行数值模拟,阐述涡核的衰减形态,考察升气管直径、入口面积以及筒体长度变化对旋转涡核边界分布的影响。结果表明:零轴速包络边界与旋转涡核边界分属不同面,二者分布于升气管投影面的两侧;旋转涡核在分离器中的自然终止形态是涡核尾端弯曲终止于壁面,并沿壁面做圆周运动;涡核边界宽度随升气管直径的减小、入口面积的增大而减小;当筒体较短时,在较大跨度的升气管直径分布内,涡核边界沿轴向近似成柱状分布。筒体长度增加会使切向速度沿轴向产生衰减,涡核边界在升气管入口区域向外扩张,沿轴向向下逐渐收缩。

Rotating vortex core boundary distribution behavior in cylindrical cyclone separator

Differential Reynolds stress model was used to simulate rotating vortex core boundary of gas phase flow field in cylindrical cyclone separator. The attenuation form of vortex core was expounded and the effects of vortex finder diameters, inlet areas and separator lengths on the distribution of rotating vortex core boundary were studied. The results show that zero axial velocity boundary and rotating vortex core boundary are different, which locate on both sides of vortex finder projection surface respectively. The natural termination form of rotating vortex core in separator is that vortex core end stops deviously on the wall of separator and makes circular motion along the wall. Vortex core boundary width decreases with the decrease of vortex finder diameters and the increase of inlet areas. Vortex core boundary in separator with small length presents columnar distribution approximatively among the larger span of vortex finder diameters distribution. The increase of separator length can make tangential velocity attenuate, and vortex core boundary expands outwards at vortex finder inlet and shrinks downwardly along the axial direction.