三相鼓泡床流动结构Kolmogorov熵分析

工程热物理学报 , 2014, 35(9): 1780-1784.

三相鼓泡床流动结构Kolmogorov熵分析

贺婷婷 ^1, , 钟文琪 ^2, , 金保昇 ^3, , 肖睿 ^4, , 李蔚玲 ^5,

1.能源热转换及其过程测控教育部重点实验室(东南大学),能源与环境学院,南京210096

2.能源热转换及其过程测控教育部重点实验室(东南大学),能源与环境学院,南京210096

3.能源热转换及其过程测控教育部重点实验室(东南大学),能源与环境学院,南京210096

4.能源热转换及其过程测控教育部重点实验室(东南大学),能源与环境学院,南京210096

5.能源热转换及其过程测控教育部重点实验室(东南大学),能源与环境学院,南京210096

基金项目: 江苏省杰出青年基金(No.770300046) 国家重点基础研究发展计划(973计划)资助项目(No.2010CB732206) 国家杰出青年科学基金(No.51325601)

关键词：三相鼓泡床 , 流型 , 压力信号 , Kolmogorov熵 , 关联维数

Application of Kolmogorov Entropy in Analysis of Flow Patterns in Three-Phase Bubble Column

Keywords： three-phase bubble column , flow patterns , pressure signal , kolmogorov entropy , correlation dimension

在三相鼓泡床试验台上收集压差脉动时间序列值,同时用高速相机采集三相鼓泡床内流动结构变化的图片信息,运用混沌参数Kolmogorov熵以及确定Kolmogorov熵参数中的关联维数对压力脉动信号进行分析,得到混沌参数随表观气速的变化曲线图,研究三相鼓泡床内流型转变的情况.结果表明,该三相鼓泡床中可以明显观察到均匀流、过渡流和非均匀流三种流型,在不同的流型下,混沌特性也不同,当表观气速为0.22 m/s时,三相系统的混沌特性最强.关联维数与Kolmogorov熵随表观气速的变化曲线上两个转折点即为流型转变气速点,分析得到第一转变气速的范围是0.036～0.064 m/s,第二转变气速为0.18 m/s.运用Kolmogorov熵识别三相鼓泡床的流型,方法可行.

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