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本文可视化实验观测了振荡热管在准稳定运行状态下管内工质的循环运行模式,并引入现代自回归(AR)模型功率谱分析方法分析了两种工质循环运行模式下振荡热管壁温振荡信号的频谱特性.研究表明:不同循环运行模式下振荡热管各工作段壁温的时域振荡信号各具特征,其AR功率谱密度图能够有效反映振荡热管循环运行的频谱特性并提取壁温时域振荡信号中的主频信息,它可以成为辨识振荡热管内工质循环运行模式的有效工具.“,”A visualization experiment is conducted to observe the cycling modes under quasi-steady operation of oscillating heat pipe (OHP).The modern autoregressive (AR) power spectrum analysis method is introduced to characterize the spectrum characteristics under two quasi-steady cycling modes.It is indicated that the time-domain oscillation of wall temperature under every cycling mode possesses their own characteristics.The AR power spectral density diagram can reflect the spectrum characteristics of different operation modes and information about the domain frequency of wall temperature oscillations,which is able to realize the identification of working fluid operation modes inside OHP.