標題: Effects of Plasma Discharges on the Ignition of a Laminar Nonpremixed Jet Flame
作者: Liao, Ying-Hao
Sun, Ming-Chien
Lai, Ru-Yi
機械工程學系
Department of Mechanical Engineering
關鍵字: Corona discharge;flame ignition;ignition probability;plasma-assisted combustion
公開日期: 1-Aug-2018
摘要: This paper experimentally investigates the effect of plasma discharges on the ignition of a laminar nonpremixed methane jet flame in a stream of co-flow air. The Reynolds number of the jet flame, based on the nominal jet velocity and the nozzle diameter, is approximately Re- j = 2000. The plasma discharge, a corona type, is produced between two tungsten wires with a diameter of 0.5 mm and a gap of 15 mm. Results show that the application of plasma discharge in a near-nozzle region is capable of ignition of the flame studied here, even though most of the ignition locations are in the lean side of the stoichiometric methane mass fraction. In general, the ignition probability (i.e., flame ignition is successfully achieved) is relatively larger as the discharge is closer to the stoichiometric methane mass fraction. In addition, the ignition probability is seen to increase with the discharge energy density. Results of the most probable ignition time, defined as the mode of the probability density function of the required flame ignition time, are consistent with those of the ignition probability. The most probable ignition time is seen to decrease with the increased ignition probability. Overall, the shorter ignition time occurs when the discharge is closer to the stoichiometric methane mass fraction or when the discharge energy density becomes larger. The estimated reduced electric field suggests the importance of the electron-impact dissociation induced by plasma discharges to the flame ignition.
URI: http://dx.doi.org/10.1109/TPS.2018.2849349
http://hdl.handle.net/11536/147995
ISSN: 0093-3813
DOI: 10.1109/TPS.2018.2849349
期刊: IEEE TRANSACTIONS ON PLASMA SCIENCE
Volume: 46
起始頁: 2881
結束頁: 2886
Appears in Collections:Articles