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교류전기장이 인가된 상태에서 전선을 통해 전파하는 화염에 대한 전선직경의 영향

Effect of Diameter on Spreading Flame over Electrical Wire with Applied AC Electric Fields

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초록

An experimental study on spreading flame over electrical wire, which was insulated by Polyethylene(PE) and had different diameters, was conducted with applied AC electric field. The result showed that the flame spread rate decreased in increase of the diameter of insulator at a fixed electric field. The flame spread rate exhibited increase or decrease tendency with applied AC electric field, having three distinct regimes depending on applied voltage and frequency. In each regime, the flame spread rate was characterized by physical parameters of applied electric fields and wire dimensions, and the behaviors could be explained by a thermal balance mechanism.

Abstract

An experimental study on spreading flame over electrical wire, which was insulated by Polyethylene(PE) and had different diameters, was conducted with applied AC electric field. The result showed that the flame spread rate decreased in increase of the diameter of insulator at a fixed electric field. The flame spread rate exhibited increase or decrease tendency with applied AC electric field, having three distinct regimes depending on applied voltage and frequency. In each regime, the flame spread rate was characterized by physical parameters of applied electric fields and wire dimensions, and the behaviors could be explained by a thermal balance mechanism.

참고문헌 (13)

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  3. Y. Nakamura, "Flame spread over electrical in subatmospheric pressure", Proc. Combuts. Inst., 32, pp.2559~2566 (2009)
  4. Y. Nakamura, "Opposed-wind effect on flame spread of electric wire in sub-atmospheric pressure", J Therm. Sci. Technol, 3, pp.430~441 (2008)
  5. A. Umemura, "Phisical model analysis of flame spreading along an electrical wire in microgravity", Proc. Combuts. Inst., 29, pp.2535~2543 (2002)
  6. S. Takahashi, "Study on unsteady molten insulation volume change during flame spreading over wire insulation", Proc. Combuts. Inst., 34, pp.2657~2664 (2013)
  7. Y. Nakamura, "Flame spread over polymer-insulated wire in sub-atmospheric pressure : Similarity to microgravity phenomena", Progress in scale modeling, pp.17~27 (2008)
  8. X. Huang, "Ignitionto-spread transition of externally heated electrical wire", Proc. Combuts. Inst., 34, pp.2505~2512 (2013)
  9. NASA Contractor Report 185147, "W.W Youngblood", ~ (1989)
  10. M. K. Kim, "Effect of AC electric fields on spread rate over electrical wire", Proc. Combust. Inst, 33, pp.1145~1115 (2011)
  11. S. J. Lim, "Flame spread over electrical wire with AC electric fields: Internal circulation, fuel vapor-jet, spread rate acceleration, and molten insulator dripping", Combust. Flame, 162(4), pp.1167~1175 (2015)
  12. 임승재, "교류전기장이 인가된 폴리에틸렌으로 피복된 기울어진 전선을 통해 하향으로 전파하는 화염에 대한 실험적 연구", 한국연소학회지, 19(4), pp.1~7 (2014), 한국연소학회[DOI]
  13. "Finite Element Method Magnetics v-4. 2"[URL]

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