摘要：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。

关键词：粒径分布；速度分布；气固两相流；循环床

Abstract：The effects of particle size distribution on the particle mean and r. m. s fluctuatingvelocity profiles were investigated in the dilute regime of a two-dimensional circulating fluidizedbed by using a Phase Doppler Particle Analyzer (PDPA).Glass beads of three different sizedistributions but having virtually the same volume mean diameter (~4Opum) were used forcomparison in the measurements. It was shown that particle mean velocities exhibited nosignificant differences among the three particle size distributions while particle r. m.s fluctuatingvelocity profiles were much affected by their size distributions.

Keywords：particle size distribution; velocity profile;gas--solid fluid;circulating fluidized bed