摘要：通过计算流体力学软件Fluent对FTW-350型涡轮空气分级机内部的分级流场进行数值模拟,根据模拟结果对不同分级轮转速时分级机内部流场的动态压力、湍动能和流动速度的分布特性进行对比分析;通过实验研究涡轮空气分级机中分级轮转速对粒径分布的影响,在每种分级轮转速时进行3种不同的加料速度实验,对激光粒度仪测得的分级产物的累积粒径、平均粒径、累积体积分布和粒径频率分布进行对比分析。结果表明:转速增加有利于分级流场的稳定,并且在转速较小时,增大分级轮转速有利于改善分级产物的粒径分布;分级轮转速变化对粒径分布的影响随着加料速度的增大不断减小。

关键词：涡轮空气分级机；分级轮转速；粒径分布

Abstract：The classification flow field of FTW-350 turbo air classifier was numerically simulated by the computational fluid dynamics software of Fluent. According to the simulation results, the distributions of dynamic pressure of flow field in the classifier,turbulent kinetic energy, and flow velocity field were compared at different wheel speeds. Experiments were conducted to research the effect of classifier wheel speeds in the turbo air classifier on particle size distribution, in which three different feeding rates were tested for each classifier wheel speed. The cumulative particle size, average particle size, cumulative volume distribution and particle size frequency distribution of the classification products tested by the laser particle size analyzer were contrastively analyzed. The results show that the increase of speed is conducive to the stability of the classification flow field, and the particle size distribution can be improved by increasing classifier wheel speeds at small values. The effect of the change of classifier wheel speed on the particle size distribution constantly reduced with the increase of feeding rate.

Keywords: turbo air classifier；classifier wheel speed；particle size distribution