气液两相流相空间复杂网络非线性动力学特性分析

Nonlinear dynamic characteristics of gas liquid two-phase flow in phase space complex network

中文关键词: 气液两相流  流体动力学  时间序列  相空间  复杂网络  

英文关键词: gas liquid two-phase flow, fluid dynamics, time series, phase space complex network

中文摘要:

      气液两相流动作为一个具有混沌特征的非线性动力学系统，其流型演化动力学特性尚未取得清楚的认识。以垂直上升管内空气-水两相流为研究对象，在实验获取气液两相流流型压差波动时间序列的基础上，将空气-水两相流的压差波动时间序列映射到流型相空间复杂网络对其非线性动力学特性进行了分析。通过分析发现在相空间不稳定周期轨的吸引特性作用下，不同流型的相空间复杂网络现呈出明显不同的网络结构，并且网络密度的演化趋势与流型的转化过程相吻合，较好地反映了垂直上升管内空气-水两相流的非线性动力学特性。

英文摘要:

      Gas liquid two-phase flow as a chaos nonlinear dynamical system, the evolution dynamics characteristics of two-phase flow pattern is not clear. Based on differential pressure time series measured from gas water two-phase flow experimental system through mapping differential pressure time series to phase space complex networks, the phase space complex network(PSCN) of flow patterns are constructed and studied to reveal the nonlinear dynamics of gas liquid two-phase flow. It is found that the network structure of different flow pattern PSCNs present different network structures under attracting effect of unstable periodic orbits The network density of PSCNs has close relation to the flow pattern transition, which can be employed to reflect nonlinear dynamics characteristics of air-water two-phase flow.