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AC 전기장이 인가된 구리 전선을 통해 전파하는 화염에 대해 피복재의 두께에 따른 화염 거동에 대한 실험적 연구
강민성(Minsung Kang),유춘상(Chunsang Yoo),박정(Jeong Park),정석호(Sukho Chung),권오붕(Ohboong Kwon) 한국연소학회 2020 한국연소학회지 Vol.25 No.4
Effects of insulation thickness on flame spread over electrical copper wires with applied AC electric fields were experimentally investigated. The AC volrage and frequency varied in ranges of 0-5 kV and 10-1000 Hz, respectively. A one electrode configuration was used such that the electric potential was applied to one wire end and thus the infinite ambience could be a ground. The results showed that the flame shape and the tilting direction were significantly influnced by applied voltage and frequency. The flame spread rate decreased in an increase of insulation thickness as well as varied sensitively with applied voltage and frequency. Additionally, the molten polyethylene (PE) experienced various dynamic behaviors such as dripping of molten PE, electrospray, di-electro-phoresis, and rotation of molten PE, essentially affecting the flame spread rate. These complicated phenomena were systematically analyzed and discussed.
합성가스의 저온 자발화 한계 온도와 수정된 화학반응 메커니즘에 대한 수치적 연구
장승언(Seungeon Jang),박진(Jin Park),한상현(Sanghyeon Han),정기성(Kisung Jung),유춘상(Chunsang Yoo),김홍집(Hongjip Kim) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.5
In this study, 2-D simulation was performed using C1, GRI3.0 and SD mechanisms to predict the auto-ignition of syngas. However, unlike the experimental results, auto-ignition was not predicted at temperature below 940 K. In order to solve this problem, chemical mechanism was modified by through various analysis. Auto-ignition was predicted in low temperature region through the modified mechanism. In addition, the modified mechanism was verified using ignition delay time, flame speed and CEMA.