PLANAR LASER-INDUCED FLUORESCENCE STUDY OF AN AMMONIA-HYDROGEN BUNSEN FLAME IN A WEAK ELECTRIC FIELD
K.D. Lavronov1, D.K. Sharaborin1, S. Liu2, R.V. Tolstoguzov1
1Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2Shanghai Jiao Tong University, Shanghai, China
Keywords: ammonia, hydrogen, methane, flame, weak electric field, planar laser-induced fluorescence, temperature field
Abstract
Results of an experimental study of a Bunsen flame using planar laser-induced fluorescence (PLIF) are presented. A conical flame is visualized in the absence and in the presence of a weak transverse electric field. Premixed methane-air and ammonia-hydrogen-air mixtures are used with Reynolds numbers Re = 1000 and 600 and air equivalence ratios φ = 0.92 and 1.00, respectively. Using the PLIF method for two-line OH, an estimate of the temperature field is obtained for the studied regimes in the absence and in the presence of the electric field. The visualization results indicate that, under the action of a weak electric field, the upper part of the flame front of the methane-air mixture becomes rounded and deflected toward the cathode. The effect of a weak electric field on the ammonia-hydrogen-air flame produces no significant changes in the shape of the flame front and no significant deflection toward the electrodes. The temperature field estimate indicates that, in the studied regimes, a weak electric field has no effect on the temperature distribution in the combustion products.
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