采用凝聚函数法对气固密相流化床流型转变过程的研究

A Study on the Mechanism of Flow Regime Transition in Gas-Solid Fluidized Beds by Use of Coherence Function

本文对气固密相流化床中鼓泡流态化向湍动流态化转变的机理进行了研究.首次引入了凝聚函数分析法对密相压力脉动信号进行分析.结合时间域的统计分析,直接证明了这一流型转变乃是床内气泡的破碎程度超过合并程度所致.

This paper presents the research work on the mechanism of flow regime transition (from bubbling to turbulent fluidization) in gas-solid fluidized beds. Combined with statistical measurement in time domain, coherence function was employed to analyze the pressure fluctuation in the bed. When the breaking of bubbles dominates over coalescence, turbulent fluidization occurs. This mechanism was directly proved by the experimental results.