TY - JOUR
T1 - Effects of a microwave-induced corona discharge plasma on premixed methane-air flames
AU - Li, Yueh Heng
AU - Chen, Chih Ting
AU - Fang, Hui Kuan
N1 - Funding Information:
This research was partially supported by the Ministry of Science and Technology under Grant Nos. MOST 104-2221-E-006-136, MOST 105-2628-E-006-005-MY3, and MOST 108-2628-E-006-008-MY3. Thank Dr. Hong-Yuan Li to perform the electric field simulation of the tungsten electrode. Computer time and numerical packages provided by the National Center for High-Performance Computing, Taiwan, are gratefully acknowledged.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/12/1
Y1 - 2019/12/1
N2 - A microwave resonator integrated with a floated electrode was used to initiate an additional plasma source to examine the effect on a flame plasma at atmospheric pressure. In the current system, the corona discharge occurred at 200 W of microwave power. The effect of a microwave-induced corona discharge plasma on a flame plasma was investigated using a double Langmuir probe. Through this probe, the electron temperature around the electrode tip was found to be significantly increased by over 350% relative to its original value, and the plasma concentration increased by over 400%. In addition to the effects of the microwave field, a DC field was observed after the plasma discharge, which resulted in a slight bending of the original profile of the ion concentration. Langmuir probe measurements along the flame axis revealed the boundary of effective region of electron acceleration by the microwave field. From the optical emission spectroscopy results measured from the gas where the discharge occurred, the mechanism underlying the flame speed enhancement as well as its application for flame stabilization could be rationalized.
AB - A microwave resonator integrated with a floated electrode was used to initiate an additional plasma source to examine the effect on a flame plasma at atmospheric pressure. In the current system, the corona discharge occurred at 200 W of microwave power. The effect of a microwave-induced corona discharge plasma on a flame plasma was investigated using a double Langmuir probe. Through this probe, the electron temperature around the electrode tip was found to be significantly increased by over 350% relative to its original value, and the plasma concentration increased by over 400%. In addition to the effects of the microwave field, a DC field was observed after the plasma discharge, which resulted in a slight bending of the original profile of the ion concentration. Langmuir probe measurements along the flame axis revealed the boundary of effective region of electron acceleration by the microwave field. From the optical emission spectroscopy results measured from the gas where the discharge occurred, the mechanism underlying the flame speed enhancement as well as its application for flame stabilization could be rationalized.
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U2 - 10.1016/j.energy.2019.116007
DO - 10.1016/j.energy.2019.116007
M3 - Article
AN - SCOPUS:85071547092
SN - 0360-5442
VL - 188
JO - Energy
JF - Energy
M1 - 116007
ER -