A Study on Self-excitation in Laminar Lifted Coflow-jet Flames

층류 동축류 제트 부상화염에서의 자기진동에 관한 연구

  • Van, Kyu Ho (Department of Mechanical Engineering, Pukyoung National University) ;
  • Lee, Won June (Department of Mechanical Engineering, Pukyoung National University) ;
  • Park, Jeong (Department of Mechanical Engineering, Pukyoung National University) ;
  • Kim, Tae Hyung (Power Generation Research Laboratory, Korea Electric Power Research Institute) ;
  • Park, Jong Ho (Department of Mechanical Engineering, Chungnam National University)
  • 반규호 (부경대학교 기계공학과) ;
  • 이원준 (부경대학교 기계공학과) ;
  • 박정 (부경대학교 기계공학과) ;
  • 김태형 (한전전력연구원 발전연구소) ;
  • 박종호 (충남대학교 기계공학과)
  • Received : 2015.02.04
  • Accepted : 2015.03.20
  • Published : 2015.03.30


A study on laminar jet flames in coflow air diluted with helium has been conducted to investigate self-excitations for various propane mole fractions and nozzle exit velocities. The stability map was represented as a function of nozzle exit velocity and fuel mole fraction for propane. The results show that two types of self-excitation were observed : (1) buoyancy-driven self-excitation (hereafter called BDSE) and (2) Lewis-number induced-self-excitation coupled with (1) (hereafter called LCB) near extinction limit for 9.4 mm nozzle diameter. It was shown that with 0.95 mm nozzle diameter, Lewis-number-induced self-excitation (hereafter LISE) and BDSE could be separated. The differences between the two self-excitations were shown and discussed.


Supported by : 한국연구재단


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