Heat-loss effects on the chaotic behavior of cellular premixed flames generated by intrinsic instability
Heat-loss effects on the chaotic behavior of cellular premixed flames generated by intrinsic instability
复制标题
热损失对内在不稳定性产生的细胞预混合火焰混沌行为的影响
DOI：
10.1299/jtst.2.79
复制
发表时间：
2007
影响因子：
1.2
通讯作者：
S. Kadowaki
中科院分区：
文献类型：
--
作者：
A. Kaewpradap;S. Kadowaki
基于可压缩Navier-Stokes方程，通过反应流动的二维非定常计算，研究了热损失对本征不稳定性产生的蜂窝状预混火焰混沌行为的影响。在平面火焰上叠加了具有线性最不稳定波数的扰动，即临界波数。随着叠加扰动的演化，由于固有的不稳定性，形成了胞状火焰锋面。胞状火焰的不稳定行为在低Lewis数时出现，并随着热损失参数的增加而增强。由于燃烧行为不稳定，燃烧速度随时间波动。为了研究燃烧不稳定行为的特征，得到了燃烧速度波动的功率谱密度。功率谱密度有一个尖峰，其频率对应于不稳定行为的典型振荡频率，并在低频段出现1/f2谱。并对燃烧速度波动进行了时间序列分析。为了研究蜂窝状预混火焰的混沌行为，我们得到了吸引子和关联维。这种特性强烈地依赖于热损失参数和Lewis数，即本征不稳定性。结果表明，本文的分析方法适用于火焰不稳定性的诊断。
Heat-loss effects on the chaotic behavior of cellular premixed flames generated by intrinsic instability were studied by two-dimensional unsteady calculations of reactive flows based on the compressible Navier-Stokes equation. The disturbance with the linearly most unstable wave number, i.e. the critical wave number, was superimposed on a planar flame. As the superimposed disturbance evolved, the cellular-flame front formed owing to intrinsic instability. The unstable behavior of cellular flames appeared at low Lewis numbers and became stronger as the heat-loss parameter increased. Owing to the unstable behavior, the burning velocity fluctuated with time. To study the characteristics of the unstable behavior, the power spectrum density of the fluctuation of the burning velocity was obtained. The power spectrum density had a sharp peak, whose frequency corresponded to the typical oscillation frequency of the unstable behavior, and the 1/f2 spectrum was found in low frequency range. Moreover, we performed the time series analysis on the burning-velocity fluctuation. We obtained the attractor and correlation dimension to study the characteristics of the chaotic behavior of cellular premixed flames. The characteristics depended strongly on the heat-loss parameter and Lewis number, i.e. on intrinsic instability. The results suggest that the present analysis is applicable to the diagnostics of the flame instability.
根据升高压力下的不稳定火焰估算未拉伸层流燃烧速度
DOI：
--
发表时间：
2007
期刊：
自動車技術会論文集 38-5
影响因子：
--
作者：
Toshiaki Kitagawa;et. al.
通讯作者：
et. al.
带有燃烧器旋转的本生火焰尖端的轨道不稳定性和预测
DOI：
--
发表时间：
2005
期刊：
Combustion and Flame (in press)
影响因子：
--
作者：
Hiroshi Gotoda;Toshihisa Ueda
通讯作者：
Toshihisa Ueda