Abstract: Similarity of upward gas-solid two-phase flow behavior in the fully developed zone under different operating conditions was further studied based on the axial pressure gradients and local solids holdups from the literature and the authors’laboratory.The results showed that the detailed hydrodynamic similitude in the fully developed zone of the CFB risers under different operating conditions could be characterized by the empirical similarity number presented in this work.It was also found that the solids holdups in the fully developed zone change linearly with the empirical similarity number.For the upward gas-solid two-phase flow systems, operating at different conditions,if the similarity numbers were the same,the local solids holdups,the solids concentrations inside cluster and the cluster existence times would display the same axial and radial distributions, respectively,in the fully developed zone.The preliminary study showed that the empirical similarity number is independent of the upward gas-solid CFB systems.

摘要： 在10.5 m高气固循环流化床实验装置上，在对提升管内的轴向压力梯度和局部颗粒浓度进行实验测试的基础上，结合部分文献上的实验数据，研究了上行气固两相流充分发展段在不同操作条件下气固两相流动行为的相似特性.结果表明，所提出的经验相似准则能表征上行气固两相流充分发展段在不同操作条件下流动行为的相似性，并且该经验相似准则独立于实验装置系统.对于同一上行气固两相流系统，只要操作参数按该相似准则同步变化，气固两相流在充分发展段就具有相似的宏观和微观流动行为.