Analysis of the effect of vortex on the flow field of a cylindrical cyclone separator
Analysis of the effect of vortex on the flow field of a cylindrical cyclone separator
复制标题
DOI：
10.1016/j.seppur.2018.08.024
复制
发表时间：
2019-03
影响因子：
8.6
通讯作者：
Zhuwei Gao;Juan Wang;J. Wang;Y. Mao;Yaodong Wei
中科院分区：
文献类型：
--
作者：
Zhuwei Gao;Juan Wang;J. Wang;Y. Mao;Yaodong Wei
本文提出了一种用Q准则的涡流识别分析旋风分离器涡流的新方法。采用相位多普勒粒子分析仪（PDPA）测量流动，采用雷诺应力模型（RSM）进行数值模拟。此外，根据Q准则，提出了等涡面的概念，用于识别涡结构。数值计算结果与实验数据吻合较好，验证了模型的正确性，并将其用于流场分析。结果表明，根据新的等涡面，可以直观地看到涡结构的变化趋势。等涡面的等效直径在圆柱上部较大，沿轴线向下沿着减小。涡旋的载流子能量逐渐衰减。在此过程中，涡旋迅速发展，甚至破裂。同时，在r/R = 0.93附近涡度值有一个突变，然后涡度值急剧上升。相对稳定区的涡线几乎呈圆形分布，而圆柱体上部涡线复杂，有分层趋势。涡心偏离几何中心的趋势先增大，达到峰值后逐渐减小。峰值的轴向位置随速度的增大而增大。此外，可以适当地调整涡结构，以改善流动的不稳定性，这是非常重要的。
This study presents a new method to analyze the vortex of cyclone separator by using the vortex identification ofQcriterion. The Phase Doppler Particle Analyzer (PDPA) is used to measure the flow, and the numerical simulation is done by using the Reynolds stress model (RSM). In addition, a new conception of iso-vortex surface according toQcriterion is proposed for identifying the vortex structure. Since the model is validated by agreement between the numerical results and experimental data, and then is used to analyze the flow field. The results show that the tendency of the vortex structure is intuitive according to the new iso-vortex surface. Equivalent diameter of the iso-vortex surface is large in the upper region of the cylinder and decreases along the axis downward. The carrier energy of vortex decay gradually. In the process, vortex develops rapidly, even ruptures. Meanwhile, the vorticity magnitude has a sudden change nearr/R = 0.93, and then vorticity magnitude rises up sharply. The vortex line of relative stable region is almost circular distribution, while the vortex line is complex at the upper region of cylinder, which has a hierarchical trend. The trend of the vortex center deviating from the geometric center firstly increases, reaches a peak value, and then reduces gradually. The axial position of peak value increases with the increase of velocity. Furthermore, the vortex structure can be appropriately adjusted to improve the flow instability, which is highly significant.