下喷自吸环流反应器内局部混沌特性(英文)

LOCAL CHAOS CHARACTERISTICS IN A SELF ASPIRATED REVERSED FLOW JET LOOP REACTOR

应用确定性混沌分析技术，初步研究了下喷自吸环流反应器内气－液两相流动的时序压力波动的局部混沌特性．结果发现，在本文实验条件下，该反应器内局部最大李雅普诺夫指数值均大于零，并且呈现出与局部分形维数类似的分布规律．这些结果表明，该反应器内的流动行为呈现混沌特性，可以应用诸如局部最大李雅普诺夫指数和局部分形维数等局部非线性特征参数从更深层上揭示多相反应器内的流动特性，例如流区过渡及流动结构等．

The local chaos characteristics of the time series pressure fluctuations of gas liquid two phase flow in a self aspirated reversed flow jet loop reactor are studied by the deterministic chaos analysis technique. It is found that the estimated local largest Lyapunov exponent is positive in all cases and the profile is similar to that of the local fractal dimension in this reactor. The positive largest Lyapunov exponent shows that the reactor is a nonlinear chaotic system. The obvious distribution indicates that the local nonlinear characteristic parameters such as the Lyapunov exponent and the fractal dimension could be applied to further study the flow characteristics such as the flow regine transitions and flow structures of the multi phase reactors.