粒径分布对循环床内颗粒速度分布的影响

利用激光相位多普勒粒子分析仪（PDPA），在截面尺寸为100mm×15mm的二维循环流化床实验装置上测量比较了平均粒径基本相同的3种不同粒径分布的玻璃珠颗粒在相同操作气速下的颗粒时均速度、脉动速度与数量密度的截面分布特性；初步考察了粒径分布对气固并流上行两相湍流流动行为的影响问题。

Influence of Particle Size Distribution on Profiles of Particle Velocities in Dilute Regime of Circulating Fluidized Bed

The effects of particle size distribution on the particle mean and r m s fluctuating velocity profiles were investigated in the dilute regime of a two-dimensional circulating fluidized bed by using a Phase Doppler Particle Analyzer (PDPA). Glass beads of three different size distributions but having virtually the same volume mean diameter (~ 40μm) were used for comparison in the measurements. It was shown that particle mean velocities exhibited no significant differences among the three particle size distributions while particle r. m. s fluctuating velocity profiles were much affected by their size distributions.