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논문 기본 정보

자료유형
학술저널
저자정보
김경택 (부경대학교) 이원준 (부경대학교) 차민석 (King Abdullah University of Science and Technology) 박정 (부경대학교) 정석호 (King Abdullah University of Science and Technology) 권오붕 (부경대학교) 김민국 (한국기계연구원) 이상민 (한국기계연구원)
저널정보
한국연소학회 한국연소학회지 한국연소학회지 제21권 제3호
발행연도
2016.9
수록면
1 - 6 (6page)

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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 O₂ + e → O₂<SUP>-</SUP> 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.

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3. 결과 및 논의
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UCI(KEPA) : I410-ECN-0101-2017-431-001093258