open access

https://hdl.handle.net/2115/50791

Transition from equilibrium to nonequilibrium combustion of premixed burner flame by microwave irradiation

英語

2012-11-14

IOP Publishing

Journal of Physics D: Applied Physics

45(45)

455202

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 of 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, ～ 1 x 10^[3] s^[-1] for the loss frequency of heated electrons, and ～ (0.5-1) x 10^[3] s^[-1] for the loss frequencies of OH and CH radicals.

学術雑誌論文

Accepted Manuscript

This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at 10.1088/0022-3727/45/45/455202.

0022-3727