柱锥段结构对旋风切割器性能的影响研究

Study on the effects of cylinder and cone structures on cut cyclone performance

针对旋风切割器设计过程中,缺少有效的切割粒径预测方法问题,本文提出了影响切割粒径变化的两个关键指标。采用CFD方法研究30 L/min流量下的旋风式切割器流场特性,通过分析圆柱段和圆锥段结构尺寸引起的切割效率、中位粒径和压降等性能的变化,并结合离心效应ψ和结构高度-旋风长度比Y/l两个关键指标,得出切割粒径受不同结构尺寸影响时的变化规律,结果与文献中的实验趋势吻合。研究表明:当结构的Y/l≤70%时,增加Y/l值可以提高切割性能;增加圆锥段占总高度的比值,可以在减小结构阻力的同时改善切割性能;增大旋风切割器内表面积可以起到降低结构阻力的作用。本文从两个关键指标变化的角度出发,为切割器结构设计与切割粒径的精准控制提供参考。

Aiming at the problem of lacking of effective cutting particle diameter prediction method in the cut cyclone design process,two key indexes affecting the change of cutting particle diameter are proposed in this paper.The flow field characteristics of the cut cyclone under 30 L/min volume flowrate are studied with CFD method,through analyzing the performance changes of the cutting efficiency,median particle diameter,pressure drop and etc.caused by the structural dimensions of cylinder and cone sections,considering the two key indexes of the centrifugal effectψand structural height to cyclone length ratio Y/l,the changing law of the structural dimensions affecting the cutting particle diameter is obtained,and the results agree with the experiment trend in the reference article.The study shows that when Y/l≤70%,increasing Y/l can improve the cutting performance;increasing the ratio of conical section to total height can improve the cutting performance while reducing the structural resistance;increasing the inner surface area of the cut cyclone can reduce the structural resistance.Starting from studying the changes of the two key indexes,this paper provides a reference for the cut cyclone structure design and the precision control of cutting particle diameter.