基于CFD的平面涡流分级机导流特性

Research on CFD-based flow-guided characteristics of plane vortex classifier

采用FLUENT流体力学软件对平面涡流分级机导流部分几何参数与操作参数进行数值模拟,重点研究蜗壳与导风叶对导流效果的影响.在分析模拟所得X-Y散点数据基础上,通过建立导风叶外圈的速度和压力偏差均值与一、二次风口进风量百分比,蜗壳偏心距,导风叶定位基圆直径,导风叶数量等重要参数的关系曲线,得出一系列较优设计目标,为平面涡流分级机导流部分的改进提供参考依据.通过试制样机SX-35并利用粉煤灰进行筛余实验,定性验证了CFD分析结果在工程运用中的正确性.

The FLUENT code is used to simulate the gas flow-field in flow-guided structure of plane vortex classifier to optimize its geometrical and operational parameters, which focuses on the effect of spiral case and guide vanes on the stable flow-field establishment. Through statistical analysis of X-Y plot data obtained from numerical simulation relation curve between average velocity deviation, average pressure deviation of outer circle of guide vanes and air volume of inlet, eccentricity of spiral case, diameter of positioning base circle, number of guide vanes are established and a series of optimal objectives are obtained, which provides reference for design of high efficiency air vortex classifier. Through manufacture the prototype SX-35 and sieving residue of fly ash, the correctness of the analysis result of CFD in engineering application is qualitatively validated.