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Effects of Microwave Induction on the Liftoff and NOx Emission in Methane Micro Jet Flames
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 Title & Authors
Effects of Microwave Induction on the Liftoff and NOx Emission in Methane Micro Jet Flames
Jeon, Young Hoon; Lee, Eui Ju;
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 Abstract
High efficient and environment friendly combustion technologies are used to be operated an extreme condition, which results in unintended flame instability such as extinction and oscillation. The use of electromagnetic energy is one of methods to enhance the combustion stability and a microwave as electromagnetic wave is receiving increased attention recently because of its high performance and low-cost system. In this study, an experiment was performed with jet diffusion flames induced by microwave. Micro jet was introduced to simulate the high velocity of industrial combustor. The results show that micro jet flames had three different modes with increasing oxidizer velocity; attached yellow flame, lifted flame, and lifted partially premixed flame. As a microwave was induced to flames, the overall flame stability and blowout limit were extended with the higher microwave power. Especially the interaction between a flame and a microwave was shown clearly in the partially premixed flame, in which the lift-off height decreased and NOx emission measured in post flame region increased with increasing microwave power. It might be attributed to increase of reactivity due to the abundance of radical pool and the enhanced absorption to thermal energy.
 Keywords
Micro jet diffusion flame;Microwave;Flame stability;NOx emission;Lift-off height;
 Language
Korean
 Cited by
 References
1.
F.J. Weinberg, K. Hom, A. K. Oppenheim, K. Teichman, "Ignition by plasma jet", Nature Vol. 272, No. 5651, 1978, pp. 341-343. crossref(new window)

2.
P. Fauchais, A. Vardelle, "Thermal plasmas", IEEE Trans. Plasma Sci., Vol. 25, No. 6, 1997, pp. 1258-1280. crossref(new window)

3.
S. M. Starikovskaia, "Plasma assisted ignition and combustion", J. Phy. D: Appl. Phys., Vol. 39, 2006, pp. 265-299. crossref(new window)

4.
X. Raoa, K. Hemawanb, I. Wichmana, C. Carterc, T. Grotjohnb, J. Asmussenb, T. Leea, "Combustion dynamics for energetically enhanced flames using direct microwave energy coupling", Proceedings of the Combustion Institute, Vol. 33, 2011, pp. 3233-3240. crossref(new window)

5.
S. Ogawa, Y. Sakai, K. Sato, S. Sega, "Influence of microwave on methane-air laminar flames", Jpn. J. Appl. Phys., Vol. 37, No. 1, 1998, pp. 179-185. crossref(new window)

6.
K. Takita, G. Masuya, T. Sato, Y. Ju, "Effect of addition of radicals on burning velocity", AIAA J., Vol. 39, No. 4, 2001, pp 742-744. crossref(new window)

7.
K. W. Hemawan, I. S. Wichman, T. Lee, T. A. Grotjohn, J. Asmussen, "Compact microwave reentrant cavity applicator for plasma-assisted combustion", Rev. Sci. Instrum., Vol. 80, No. 5, 2009, 053507. crossref(new window)

8.
Y. C. Hong, S. C. Cho, C. U. Bang, D. H. Shin, J. H. Kim, H. S. Uhm, W. J. Yi, "Microwave plasma burner and temperature measurements in its flame", Appl. Phys. Lett., Vol. 88, No. 20, 2006, pp. 201502-201504. crossref(new window)

9.
E. S. Stockmana, S. H. Zaidia, R. B. Milesa, C. D. Carterb, M. D. Ryanc, "Measurements of combustion properties in a microwave enhanced flame", Combustion and Flame, Vol. 156, No 7, 2009, pp. 1453-1461. crossref(new window)

10.
Y. H. Jeon and E. J. Lee, "Characteristics of the microwave induced flames on the stability and pollutant emissions", Journal of the Korean Society of Safety. Vol. 29, No. 4, 2014, pp.23-27. crossref(new window)