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Experimental Study on Comparison between Buoyancy Driven and Lewis Number Induced Self-excitations in Laminar Lifted Coflow-jet Flames

층류 동축류 제트 부상화염에서 부력에 의한 자기진동과 루이스 수에 의한 자기진동 비교에 관한 실험적 연구

  • Lee, Won June (Department of Interdisciplinary Program of Marine-Bio, Electrical & Mechanical Engineering, Pukyong National University) ;
  • Park, Jeong (Department of Mechanical Engineering, Pukyong National University) ;
  • Kwon, Oh Boong (Department of Mechanical Engineering, Pukyong National University) ;
  • Yun, Jin Han (Environment & Energy Research Division, Korea Institute of Machinery and Materials) ;
  • Keel, Sang In (Environment & Energy Research Division, Korea Institute of Machinery and Materials)
  • 이원준 (부경대학교 의생명융합공학협동과정) ;
  • 박정 (부경대학교 기계공학과) ;
  • 권오붕 (부경대학교 기계공학과) ;
  • 윤진한 (한국기계연구원 그린환경에너지기계본부) ;
  • 길상인 (한국기계연구원 그린환경에너지기계본부)
  • Received : 2014.02.24
  • Accepted : 2014.06.19
  • Published : 2014.06.30

Abstract

Experimental study in laminar propane coflow jet flames has been conducted to investigate self-excitations. For various propane mole fractions and jet velocities, two types of self-excitation were observed: (1) buoyancydriven self-excitation (hereafter called BDSE) and (2) Lewis-number-induced self-excitation coupled with (1) (hereafter called LCB). The mechanism of Lewis-number-induced self-excitation (hereafter called LISE) is proposed. When the system $Damk\ddot{o}hler$ number was lowered, LISE was shown to be launched. The LISE is closely related to heat loss, such that it can be launched in even helium-diluted methane coflow-jet flame (Lewis number less than unity). Particularly, The LISE becomes significant as the $Damk\ddot{o}hler$ number decreases and heat-loss is excessively large.

Acknowledgement

Supported by : 한국에너지기술평가원

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