Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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Effect of AC Electric Field on Decreasing Liftoff Height in Laminar Lifted Jet Flames

층류 부상 화염의 화염부상 높이 감소 구간에서 교류 전기장이 인가된 화염에 관한 영향

  • Seo, B.H. (Dept. of Mechanical Engineering, Pukyoung National University) ;
  • Van, K.H. (Dept. of Mechanical Engineering, Pukyoung National University) ;
  • Kim, G.T. (Dept. Interdisciplinary Program of Marine-Bio, Electric& Mechanical Engineering, Pukyong National University) ;
  • Park, J. (Dept. of Mechanical Engineering, Pukyoung National University) ;
  • Keel, S.I. (Korea Institute of Machinery and Materials) ;
  • Kim, S.W. (Korea Institute of industrial Technology) ;
  • Chung, S.H. (King Abdullah University of Science and Technology, Clean Combustion Research Center)
  • Received : 2017.05.02
  • Accepted : 2017.06.16
  • Published : 2017.09.30
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Abstract

An experimental study has been conducted to elucidate the effect of AC electric field on behaviors of laminar lifted flame in nitrogen-diluted methane coflow-jets. Our concerns are focued on the regime to show a decrease in liftoff height, $H_L$ with increasing nozzle exit velocity, $U_O$ (hereafter, $decreasing-H_L$). The $H_L$ with $U_O$ near flame extinction were measured by varying the applied AC voltage, $V_{AC}$ and frequency, $f_{AC}$ in a single electrode configuration. The behavior of $H_L$ with a functional dependency of $V_{AC}$ and $f_{AC}$ was categorized into two regime : (I) $H_L$ decreased for nozzle diameter, D = 1.0 mm, and (II) $H_L$ increased in the increase of $f_{AC}$ for a fixed $V_{AC}$ in a D = 4.0, 8.4 mm. The lifted flames in $decreasing-H_L$ region was unstable in high voltage regimes while the $H_L$ showed a decreasing tendency with $U_O$ except them. Such behaviors in $H_L$ were also characterized by functional dependencies of related physical parameters such as $V_{AC}$, $f_{AC}$, $U_O$, fuel mole fraction ($X_{F.O}$) and D.

Keywords

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