摘要
为研究锥面母线曲率对旋风分离器内部流场以及分离性能的影响,采用雷诺应力模型(RSM)和离散相模型(DPM)进行数值模拟,并用能量梯度理论分析内部涡流场的稳定性。研究发现:随着锥面母线曲率的增大,旋风分离器内部气流切向速度的最大值变大,旋风分离器的上行流量变小;当母线曲率在1.7×10-4~3.4×10-4之间时,该结构的旋风分离器最符合"高效率低压降"的要求;通过分析组合涡的结构特性,发现当母线曲率在1.7×10-4~3.4×10-4之间时,外涡的主要切向速度分布趋势最接近理论自由涡的速度分布,并且此时的准自由涡区域占组合涡结构的比例相对较大。根据能量梯度理论,自由涡分布具有最好的稳定性,从而在本质上解释了该结构获得最优性能的原因。
In order to study the influence of conical generatrix curvature on inner flow field and separating performance of cyclone separator, numerical simulation was carried out with Reynolds stress model （RSM） and discrete phase model （DPM）. Besides, energy gradient theory was used to analyze stability of internal vortex field. The results show that with the increase of conical generatrix curvature, the maximum of tangential velocity of airflow in the cyclone separator rises and the upward flow of the cyclone separator decreases. It is found when the curvature is 1. 7 ×10^-4～3.4×10^-4, the cyclone separator of such structure most meets the requirement of high efficiency and low pressure drop. Through analysis of structural characteristics of combined vortex, it is further found that when the curvature is 1.7 ×10^-4～3.4×10^-4, main tangential velocity distribution trend of outer vortex most approaches the velocity distribution of free vortex, and the proportion of quasi-free vortex to combined vortex structure is relatively large. The free vortex distribution has the best stability according to the energy gradient theory, which may be the reason why the structure can get the optimal performance.
出处
《浙江理工大学学报（自然科学版）》
2017年第1期54-62,共9页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金项目(51579224)
关键词
旋风分离器
曲率
能量梯度理论
压降
分离效率
cyclone separator
curvature
energy gradient theory
pressure drop
separation efficiency
