Transition from equilibrium to nonequilibrium combustion of premixed burner flame by microwave irradiation
Transition from equilibrium to nonequilibrium combustion of premixed burner flame by microwave irradiation
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DOI：
10.1088/0022-3727/45/45/455202
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发表时间：
2012-11-14
影响因子：
3.4
通讯作者：
Shinohara, Koji
中科院分区：
文献类型：
--
作者：
Sasaki, Koichi;Shinohara, Koji
研究发现，预混燃烧器火焰中的加热电子可以提高火焰的燃烧速度。电子加热是通过将微波功率照射到火焰上来实现的，并且通过观察第二正系统处的分子氮的光发射强度来确认。由于所观察到的气体温度的增加是可以忽略的，燃烧速度的增强可以归因于由高能电子驱动的非平衡燃烧化学。我们研究了在脉冲微波功率的作用下，平衡和非平衡燃烧状态之间的转变的时间常数。结果，我们发现电子加热的频率> 2 x 10（4）s（-1），加热电子的损失频率类似于1 x 10（3）s（-1），OH和CH自由基的损失频率类似于（0.5-1）x 10（3）s（-1）。
We found that the burning velocity in premixed burner flame was enhanced by heated electrons in the flame. The electron heating was realized by irradiating microwave power onto the flame, and was confirmed by observing optical emission intensity of molecular nitrogen at the second positive system. Since the increase in the observed gas temperature was negligible, the enhancement of the burning velocity can be attributed to the nonequilibrium combustion chemistry which is driven by energetic electrons. We examined the time constants for the transition between equilibrium and nonequilibrium combustion states by irradiating pulsed microwave power. As a result, we found > 2 x 10(4) s(-1) for the frequency of electron heating, similar to 1 x 10(3) s(-1) for the loss frequency of heated electrons, and similar to(0.5-1) x 10(3) s(-1) for the loss frequencies of OH and CH radicals.