袁惠新,凌继万,付双成,周发戚
Yuan Huixin,Ling Jiwan,Fu Shuangcheng,Zhou Faqi

• 1:常州大学机械工程学院
• 2:江苏省绿色过程装备重点实验室

摘要(Abstract)：

颗粒的分级作为目前粉体材料加工与应用的基本技术之一,已被广泛的应用于各个领域,如矿物加工与分选、冶金等方面。旋风分离器的主要结构参数对旋风分离器内的流场影响最大,但目前鲜有人研究其对分级的影响。通过对旋风分离器的锥角与排气管插入深度进行数值模拟研究,采用非稳态离散项模型与雷诺应力模型的方法研究其对压力降与分级性能的影响。结果表明:排气管插入深度对分级粒径和分级精度都有显著的影响,插入深度过小甚至没有插入深度都对分级精度的提高不利,但插入深度增大会增大分级粒径和压力降;对于分级精度,锥角存在最佳值,但分级粒径和压力降都随锥角的增大而增大;最佳锥角值与溢流管插入深度有关,其随着溢流管插入深度的增大而减小;自然旋风长在分级精度曲线峰值处保持在一个稳定的范围内,对于柱段长度与入口结构不变的情况,自然旋风长在3.2 D～3.5 D之间分级精度较高。
As one of the basic techniques for the processing and application of powder materials,particle grading has been widely used in various fields,such as mineral processing and sorting,metallurgy and so on.The main structural parameters of the cyclone separator have the greatest influence on the flow field in the cyclone separator,but little is known about its influence on the classification.In this paper,the numerical simulation of the cone angle of the cyclone separator and the insertion depth of the exhaust pipe is carried out.The effects of the unsteady Discrete Particle Model and the Reynolds Stress Model on the pressure drop and the classification performance are studied.The results show that the insertion depth of the exhaust pipe has a significant influence on the classification particle size and classification accuracy.The too small insertion depth or even no insertion depth is unfavorable for the improvement of the classification accuracy,but increasing the insertion depth increases the classification particle size and pressure drop.The cone angle has the best value,but the graded particle size and pressure drop increase with the increasing of the cone angle.The optimum cone angle value is related to the depth of the overflow tube insertion,which increases with the increasing of insertion depth of the overflow tube.The natural vortex length is kept in a stable range at the peak of the classification accuracy curve and for the case where the length of the column segment and the inlet structure are constant,the natural cyclone length is between 3.2D and 3.5D.

关键词(KeyWords)： 分级;锥角;排气管插入深度;数值模拟;自然旋风长
grading;cone angle;depth of overflow tube;numerical simulation;natural vortex length

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(21676031)

作者(Author): 袁惠新,凌继万,付双成,周发戚
Yuan Huixin,Ling Jiwan,Fu Shuangcheng,Zhou Faqi

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