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http://dx.doi.org/10.15231/jksc.2016.21.3.001

Effect of AC Electric Fields on Flow Instability in Laminar Jets  

Kim, Gyeong Taek (Interdisciplinary Program of Biomedical Engineering, Pukyong National University)
Lee, Won June (Interdisciplinary Program of Biomedical Engineering, Pukyong National University)
Cha, Min Suk (King Abdullah University of Science and Technology, Clean Combustion Research Center)
Park, Jeong (Department of Mechanical Engineering, Pukyong National University)
Chung, Suk Ho (King Abdullah University of Science and Technology, Clean Combustion Research Center)
Kwon, Oh Boong (Department of Mechanical Engineering, Pukyong National University)
Kim, Min Kuk (Environmental & Energy System Research Division, Korea Institute of Machinery and Materials)
Lee, Sang Min (Environmental & Energy System Research Division, Korea Institute of Machinery and Materials)
Publication Information
Journal of the Korean Society of Combustion / v.21, no.3, 2016 , pp. 1-6 More about this Journal
Abstract
The effect of applied electric fields on jet flow instability was investigated experimentally by varying the direct current (DC) voltage and the alternating current (AC) frequency and voltage applied to a jet nozzle. We aimed to elucidate the origin of the occurrence of twin-lifted jet flames in laminar jet flow configuration, which occur when AC electric fields are applied. The results indicate that a twin-lifted jet flames originates from cold jet instability, caused by interactions between negative ions in the jet flow via electron attachment as $O_2+e{\rightarrow}O_2{^-}$ when AC electric fields are applied. This was confirmed by experiments in which a variety of gaseous jets were ejected from a nozzle to which DC voltages and AC frequencies and voltages were applied, with ambient air between two deflection plates connected to a DC power source. Experiments in which jet flows of several gases were ejected from a nozzle and AC electric fields were applied in coflow-nitrogen provided further evidence. The flow instability occurred only for oxygen and air jets. Additionally, jet instability occurred when the applied frequency was less than 80 Hz, corresponding to the characteristic collision response time. The effect of AC electric fields on the overall structure of the jet flows is also reported. Based on these results, we propose a mechanism to reduce jet flow instability when AC electric fields are applied to the nozzle.
Keywords
Electric fields; Jet flow instability; Twin jet flame;
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