脉动热管闭合回路内热驱动气液两相脉动运行特性的非线性研究

Non-Linear Study on Thermally Driven Vapor-Liquid Two-Phase Pulsating in Closed Loop of Pulsating Heat Pipe

本文实验测试了脉动热管闭合回路内热驱动气液两相脉动运行过程中管壁温度脉动特征,并对所采集到的壁温脉动时间序列信号进行了相空间重构,研究了混沌吸引子形态与气液两相脉动运行模式间的内在联系,分析了管内气液两相脉动运行非线性特性随运行模式的变化规律。研究表明:脉动热管闭合回路内热驱动气液两相脉动运行既非是周期性行为也非是完全随机行为,而是具有典型的混沌特征;壁温脉动时间序列信号的混沌吸引子形态对运行模式的转化敏感,故其可以成为辨识管内气液两相工质脉动运行的有效工具。

An experiment is conducted to measure wall temperature oscillation during the thermally driven vapor-liquid two-phase pulsating in closed loop of pulsating heat pipe（PHP）.The 3-D chaotic attractors of the collected time-domain temperature pulsating are reconstructed,the patterns of which are correlated with the vapor-liquid two-phase pulsating modes.The evolution of non-linear characteristics for wall temperature oscillation is also analyzed.It is indicated that the thermally driven vapor-liquid two-phase pulsating in closed loop of PHP is not periodic or random,which is typically chaotic.The patterns of 3-D chaotic attractors for wall temperature oscillation is sensitive to the transition of the vapor-liquid two-phase pulsating modes,which thus can be regarded as an useful tool for identifying the vapor-liquid two-phase pulsating modes inside PHP.