中文摘要：

在一套流化床冷模实验装置中研究了A类颗粒在鼓泡床和湍流床内的微观两相流动结构,测量了床层内不同轴、径向位置的瞬时固含率脉动信号,通过MATLAB软件进行解耦并统计分析求解出稠密相与稀疏相的平均固含率,以此为基础拟合了瞬时固含率信号的概率密度曲线,最后从信号中提取出颗粒聚团的有关信息.结果表明,瞬时固含率为0.05～0.72,乳化相中颗粒聚团平均固含率为0.552～0.562.颗粒聚团的体积分率和出现频率随表观气速增加而降低,分别为0.01～0.5和0.02～1.6 Hz,持续时间小于0.12 s.

英文摘要：

Transient solid hold-up signals were registered in a cold fluidized bed and statistically analyzed. Particle agglomerates in the emulsion phase were identified from signals and the agglomerate properties were investigated. The volume fraction of the transient solid holdup signals varied from 0.05 to 0.72. Mean solid holdup of particle agglomerates in the emulsion fluctuated in the range of 0.552～0.562, barely influenced by switch of operation pattern. The volume fraction of the particle agglomerates decreased first and then increased with increasing superficial gas velocity, varying over a range of 0.01～0.5 with flow regimes. Agglomerate frequency varied over the range of 0.02～1.6 Hz and the duration time was less than 0.12 s in most cases.