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采用非线性分析方法对氧相变换热器的入、出口压力脉动时间序列进行分析,提取关联维数、Ko1omogrov熵,并对重构10维相空间矩阵的协方差矩阵进行最大奇异值分解.验证了该热力学系统是具有混沌特征的非线性系统.针对物质在临界点附近的特性,考察了各混沌特性参数和普朗特数的关联性,结果表明:压力脉动信号蕴含了与系统相关的大量物理信息;各混沌特性参数与普朗特数这一物性参数之间存在明显关联性;说明各参数反映物质本身的物理本质,可以作为考察物质相变物理特性的重要参数.
The non-linear analysis method was used to analyze the time series of inlet and outlet pressure pulsation of oxygen phase change heat exchanger. The correlation dimension and Ko1omogrov entropy were extracted, and the maximum singular value decomposition of the covariance matrix of reconstructed 10-dimensional phase space matrix was performed. The thermodynamic system is verified to be a nonlinear system with chaotic characteristics.According to the characteristics of the material near the critical point, the correlation between chaotic characteristic parameters and Prandtl number is investigated. The results show that the pressure-pulsation signal contains system-related A large number of physical information; there is a clear correlation between the chaotic characteristic parameters and the Prandtl number; that each parameter reflects the physical nature of the material itself can be used as an important parameter to examine the physical properties of the material phase transition.