Smart control of the power generation system due to multiple-micro flames: chaos time series analysis

在这项研究中，我们研究了甲烷-空气预混火焰在多个微管上形成的脉动。当当量比在单位附近时，在每个管子上分别形成一个预混火焰，测量了预混火焰亮度强度的波动，得到了亮度波动的均方根和功率谱密度。由于预混火焰是稳定的，所以得到的均方根相当小。RMS随当量比的增加而略有增加。1/f谱出现在低频段，功率谱密度在足够大的当量比下出现尖峰，并对预混火焰的亮度强度进行了时间序列分析。对吸引子进行了重构，观察到了甜甜圈吸引子和奇异吸引子。结果表明，亮度波动分析，即混沌时间序列分析，适用于预混火焰的诊断。

In this research we treated the fluctuation of methane-air premixed flames formed on multiple micro tubes. A premixed flame was individually formed on each tube when the equivalence ratio was around unity.We measured the fluctuation of brightness intensity of premixed flames and obtained the RMS and power spectrum density of the brightness fluctuation. The obtained RMS was considerably small because premixed flames were stable. The RMS slightly increased by increasing the equivalence ratio. The 1/f spectrum appeared in low frequency range, and the sharp peak in the power spectrum density was found at sufficiently large equivalence ratios.In addition, we performed the time series analysis of the brightness intensity of premixed flames. The attractor was reconstructed, and the doughnut and strange types of attractors were observed.The present results suggested that the analysis of the brightness fluctuation, i.e. the chaos time series analysis, was applicable to the diagnostics of premixed flames.