The Effects of the Activation Energy on the Intrinsic Instability of Adiabatic and Non-Adiabatic Premixed Flames
The Effects of the Activation Energy on the Intrinsic Instability of Adiabatic and Non-Adiabatic Premixed Flames
复制标题
活化能对绝热和非绝热预混火焰本征不稳定性的影响
DOI：
10.1299/jfst.3.219
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发表时间：
2008
影响因子：
0.8
通讯作者：
S. Kadowaki
中科院分区：
文献类型：
--
作者：
A. Kaewpradap;S. Kadowaki
通过基于可压缩纳维-斯托克斯方程的反应流二维非定常计算，研究了活化能对绝热和非绝热预混火焰固有不稳定性的影响。将正弦扰动叠加在平面火焰上，以获得生长速率与波数之间的关系，即色散关系，以及由固有不稳定性产生的细胞火焰的燃烧速度。当路易斯数Le=1时，活化能对绝热火焰的不稳定性没有影响。在非绝热火焰中，随着活化能的增加，生长速率和燃烧速度降低，因为火焰前锋温度的降低对大活化能下火焰的不稳定性有很大影响。当Le<1时，活化能对绝热和非绝热火焰都有很大影响。随着活化能的增加，由于泽尔多维奇数的增加，生长速率和燃烧速度急剧增加。此外，在大活化能下观察到细胞火焰锋的不稳定行为。另一方面，当Le>1时，生长速率和燃烧速度随着活化能的增加而降低。这是因为扩散热效应的稳定化影响变得更大。结果表明，活化能对绝热和非绝热预混火焰的固有不稳定性起着重要作用。
The effects of the activation energy on the intrinsic instability of adiabatic and non-adiabatic premixed flames were studied by two-dimensional unsteady calculations of reactive flows based on the compressible Navier-Stokes equation. A sinusoidal disturbance was superimposed on a planar flame to obtain the relation between the growth rate and the wave number, i.e. the dispersion relation, and the burning velocity of a cellular flame generated by intrinsic instability. When the Lewis number Le = 1, the activation energy had no effects on the instability of adiabatic flames. In non-adiabatic flames, the growth rate and burning velocity decreased as the activation energy increased, because the reduction of temperature at the flame front had a great influence on the flame instability at large activation energies. When Le < 1, the activation energy had much effects on both adiabatic and non-adiabatic flames. As the activation energy increased, the growth rate and burning velocity increased drastically, because of the increase of the Zeldovich number. In addition, the unstable behavior of cellular-flame fronts was observed at large activation energies. When Le > 1, on the other hand, the growth rate and burning velocity decreased as the activation energy increased. This was because that the stabilizing influence of diffusive-thermal effects became larger. The obtained results showed that the activation energy played an important role in the intrinsic instability of adiabatic and non-adiabatic premixed flames.
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.