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Smart control of hydrogen and methane lean combustion with environmental catalysis and high temperature air combustion

环境催化和高温空气燃烧智能控制氢气和甲烷贫燃

基本信息

批准号：
16560177
负责人：
KADOWAKI Satoshi
金额：
$ 2.37万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560177/
关键词：
combustion control environmental catalysis methane instability chaos fluctuation attractor 水素・メタン高温空気燃焼

项目摘要

In this research we deal with the flame shape and fluctuation in the lean burn of methane-air mixtures on a flat burner. Planar flames are formed at 0.74<φ<1.00, and cellular flames are formed at φ<0.74, where φ is the equivalence ratio. The cell size becomes larger as the equivalence ratio becomes lower.We measure the fluctuation of brightness of premixed flames, and obtain the RMS and power spectrum density of the brightness fluctuation. With a decrease in the equivalence ratio, the RMS of the brightness fluctuation increases. This is because the diffusive-thermal effect has a destabilizing influence at low equivalence ratios. The power spectrum density has sharp peaks, whose frequency corresponds to the oscillation frequency of premixed flames, and the 1/f spectrum appears in low frequency range.In addition, we perform the time series analysis on the brightness fluctuation. We obtain the attractor, correlation dimension, and Lyapunov exponent to investigate the characteristics of the fluctuation of premixed flames. The characteristics of fluctuation depend strongly on the equivalence ratio, i.e., on the intrinsic instability of premixed flames. The results suggest that the fluctuation analysis is applicable to the diagnostics of flame instability.Moreover, the flow rate of gas mixtures is changed, and the characteristics of fluctuation are studied. The flow rate has a great influence on the attractor, correlation dimension, and Lyapunov exponent. Thus, we can estimate the flow rate through the time series analysis in chaotic behavior of premixed flames.

本文研究了平板燃烧器上甲烷-空气混合气稀薄燃烧时火焰的形状和波动。在0.74<φ<1.00处形成平面火焰，在φ<0.74处形成胞状火焰，其中φ为等效比。等效比越低，电池尺寸越大。测量了预混火焰的亮度波动，得到了亮度波动的均方根值和功率谱密度。随着等效比的减小，亮度波动的均方根值增大。这是因为扩散热效应在低等效比下具有不稳定影响。功率谱密度呈尖峰状，其频率对应于预混火焰的振荡频率，在低频范围内出现1/f谱。此外，我们还对亮度波动进行了时间序列分析。我们得到了吸引子、相关维数和Lyapunov指数来研究预混火焰的波动特性。波动特性在很大程度上取决于等效比，即预混火焰的内在不稳定性。结果表明，波动分析方法适用于火焰不稳定性的诊断。同时，对混合气的流量进行了变化，并对其波动特性进行了研究。流量对吸引子、相关维数和李亚普诺夫指数有很大的影响。因此，我们可以通过时间序列分析预混合火焰的混沌行为来估计流量。