摘要：在对实验室小型超细粉射流分级机流场分析的基础上，对上述机型进行了改进与放大，并通过试验研究证明改进后的机型分级性能有了很大提高，流场分布更加合理。

关键词：超细粉；射流分级；数学回归；流场分布

Abstract：The improvement and magnification of super-fine pow der jet classifier is carried out based on flow field analysis of the small classifier in laboratory．The experimental study results prove that the classification properties of the improved classifier increase remarkably，and its flow field distribution is more reasonable．

Key words：super-fine pow der；jet classifying；mathematics regression；flow field distribution