摘要：以湍流脉动分量服从正态分布的假设为基础，导出湍流对分级效率影响的数学方程。方程数值解表明，湍流度越大对分级效率的影响越大，湍流对所有粒径的颗粒都有影响，但不会导致“鱼钩效应”的产生。

关键词：湍流;气流分级;分级效率;正态分布;

Abstract：that the pulsation speed of turbulent flow subjects to normal.This paper assumesdistribution, and thus develops the formula of classifying efficiency under influence of turbulence.The numerical value solution shows that the bigger turbulent degree leads the'greater influence onefficiency, and this kind of influence is valid for powders of all sizes, but is not the origin of "fishhook，effect”

Key words：turbulent flow; air classification; classifying efficiency; normal distribution