Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Effects of the Carrier-gas Flow-rate on the Combustion Characteristics of the Ultrasonically-atomized Slit-jet Flame

초음파에 의해 무화된 슬릿제트화염의 연소특성에 대한 수송기체 유량의 영향

  • Kim, Min Sung (Department of Mechanical Engineering, Pukyong National University) ;
  • Bae, Dae Seok (Department of Mechanical Engineering, Pukyong National University) ;
  • Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University)
  • Received : 2016.04.20
  • Accepted : 2016.05.15
  • Published : 2016.06.01
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Abstract

An experimental study was performed to investigate the combustion characteristics of the liquid hydrocarbon fuel atomized by an ultrasonic oscillator. Configuration of the flame was caught by the high-speed camera, and images were analyzed in detail through a post-processing. In addition, the fuel consumption was measured using the balance during the combustion reaction. As a result, the consumption of atomized fuel increased with the increasing flow-rate of carrier-gas, but any correlation between the air/fuel ratio and carrier-gas flow-rate was not found. The variation of flame area was dependent on the fuel consumption and input power of the ultrasonic oscillator. FFT (Fast Fourier Transform) analyses using the flame area were conducted in order to discuss flame flickering.

초음파 진동자에 의해 미립화된 탄화수소계 액체연료 분사화염의 연소특성을 고찰하기 위한 실험이 수행되었다. 초고속카메라를 이용하여 미립화된 액체연료의 화염형상을 획득하였고, 이미지 후처리를 통해 화염의 구조와 거동을 면밀히 분석하였다. 또한 정밀유량계측법을 이용하여 연소반응 시 소모된 연료량도 측정하였다. 그 결과, 수송기체 유량이 증가하면 무화된 연료의 분사량도 같이 증가하였으나, 공연비(air/fuel ratio)와 수송기체 유량의 상관성은 관찰되지 않았다. 화염면적은 공연비 보다는 연료의 분사량과 진동자 인가전력에 종속하였으며, 화염면적의 FFT 분석을 통해 생성화염의 진동특성도 고찰하였다.

Keywords

References

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