Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Combustion Characteristics of a Gaseous Methane-Gaseous Oxygen Diffusion Flame Sprayed by a Shear Coaxial Injector

전단 동축형 인젝터를 통해 분사된 기체메탄-기체산소 확산화염의 연소특성

  • Hong, Joon Yeol (Department of Mechanical Engineering, Pukyong National University) ;
  • Bae, Seong Hun (Department of Mechanical Engineering, Pukyong National University) ;
  • Kwon, Oh Chae (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University)
  • Received : 2017.03.24
  • Accepted : 2017.05.12
  • Published : 2017.06.01
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Abstract

The combustion characteristics of gaseous methane-gaseous oxygen, an eco-friendly bipropellant injected by shear coaxial injector, were investigated. Flame was photographed under various combustion conditions using a DSLR camera, and the characteristics of the flame shape was quantified by image post-processing. From the view point of stabilization, the diffusion flame could be divided into anchored flame regime and blow-off regime. As the oxidizer Reynolds number ($Re_o$) increased, a probability of the formation of anchored flame increased with the length of flame. The shear coaxial injector used in this experiment was found to require a large length-to-diameter ratio of combustion chamber because it formed a relatively long flame in the injection direction due to a poor mixing depending only on the momentum diffusion of two propellant jets.

전단 동축형 인젝터를 통해 분사된 친환경 이원추진제 기체메탄-기체산소의 연소특성을 규명하기 위한 연구를 수행하였다. DSLR카메라를 이용하여 다양한 연소조건에서 화염을 촬영하였고, 이미지 후처리 기법을 통해 화염형상을 정량화한 후 그 특성을 분석하였다. 안정화 관점에서 확산화염은 anchored flame regime과 blow-off regime으로 구분될 수 있었으며, 산화제 레이놀즈 수($Re_o$)가 증가함에 따라 부착화염의 형성, 화염의 길이가 증가하는 경향을 나타냈다. 본 실험에 이용된 전단 동축형 인젝터는 추진제 제트의 운동량 확산에만 종속하고 그리 양호하지 않은 혼합으로 인해 분사방향으로 길이가 긴 화염을 형성하게 되므로 보다 큰 연소실 길이직경비가 요구됨을 확인할 수 있었다.

Keywords

References

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