气-液-固三相并流体系的混沌识别

Chaos Analysis of Gas-Liquid- Solid Three Phases Cocurrent Flow System

通过重构相空间、Poincare截面、分维、Kolmogorov熵和Lyapunov指数谱等混沌分析方法对气 -液 -固三相并流向上流动系统的压力波动信号进行了定性和定量研究 ,研究表明 :此类系统具有非线性混沌现象 ;计算结果显示 ,系统普遍存在 2～ 3个分维 ,其中低频大尺度波动对应的分维反映全局动力学行为 。

Chaos analysis of the dynamic behaviors of gas-liquid-solid three phases cocurrent up flow system was conducted by reconstructed phase space, Poincare section, correlation dimension, Kolmogorov entropy and Lyapunov exponent. It shows that this system is a non linear chaos system. Two or three non integer correlation dimensions and positive finite vales of the Kolmogorov entropies are found in this system. One correlation dimension is corresponding to small scale fluctuations, probably representing particle motion and local turbulence, anothercorrelation dimension corresponds to low frequency fluctuation, reflecting large scale phenomena, the third correlation dimension indicates middle scale fluctuation, which reflects the self similarity of the chaos system.