Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Effects of the Recess and Propellants Mass Flow on the Flammability Limit and Structure of Methane-Oxygen Diffusion Flame

인젝터 리세스와 추진제 공급유량이 메탄-산소 확산화염의 가연한계와 구조에 미치는 영향

  • Hong, Joon Yeol (Department of Mechanical Engineering, Pukyong National University) ;
  • Bae, Seong Hun (Department of Mechanical Engineering, Pukyong National University) ;
  • Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University)
  • Received : 2017.10.15
  • Accepted : 2017.12.27
  • Published : 2018.02.01
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Abstract

In order to analyze the flammability limit and structure of the gaseous methane-gaseous oxygen diffusion flame formed through a shear coaxial injector, combustion experiments were carried out according to the condition of injector recess and propellant mass-flow rate. As a result, it was confirmed that stable anchored flame was observed even at the high oxygen Reynolds number as the propellant momentum flux ratio increased, and that the recess had no significant influence on the flame shape and flammability limit. The anchored flame visualized through a chemiluminescence showed the maximum OH radical emission intensity at a specific position, irrespective of the propellant injection condition, and the radical intensity was greatly reduced by the injector recess.

전단 동축형 인젝터를 통해 분사된 기체메탄-기체산소 확산화염의 가연한계와 구조분석을 위해 인젝터 리세스와 추진제 공급유량에 따른 연소실험이 수행되었다. 연구 결과, 추진제 운동량 플럭스 비가 증가함에 따라 높은 산화제 레이놀즈 수 구간에서도 안정적인 부착화염이 관찰되었으며, 인젝터 리세스는 화염의 형태와 가연한계에 큰 영향을 미치지 않음을 확인하였다. 자발광 기법을 통해 가시화된 부착화염은 추진제 분사조건이 변함에도 불구하고 항상 일정한 지점에서 최대 OH 라디칼 방사강도를 나타내었으며, 그 강도는 리세스에 의해 심하게 감소함을 확인하였다.

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References

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