Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Behavior of the Ultrasonically-atomized Liquid-fuel Flame Injected through a Slit-jet Nozzle

Slit-jet 노즐을 통해 분사되는 초음파 무화 액체연료 화염의 거동

  • Kim, Min Cheol (Department of Mechanical Engineering, Pukyong National University) ;
  • Kim, Min Sung (Aerospace Division, Vitzro Nextech Co., Ltd) ;
  • Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University)
  • Received : 2018.06.25
  • Accepted : 2018.08.31
  • Published : 2018.12.01
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Abstract

An experimental study was performed for the behavior of the burner flame which results from burning of the liquid hydrocarbon fuel atomized by an ultrasonic transducer. Configurations of the flame and combustion-field were caught by both high-speed camera and thermo-graphic camera, and those images were analyzed in detail through a image post-processing. As a result, the combustion-field grew and reaction-temperature rose due to the strengthening of combustion reaction with the increasing flow-rate of carrier-gas. In addition, a phenomenon of flame flickering was discussed through the comparative analysis of the variational behavior between the visible flame and IR (Infrared) flame-field. Also, the flickering frequency of the flame was confirmed through FFT (Fast Fourier Transform) analysis employing the flame area.

초음파 진동자에 의해 미립화된 탄화수소계 액체연료를 분사하는 버너에서 생성되는 화염의 거동을 고찰하기 위한 실험이 수행되었다. 고속카메라와 열화상 카메라를 이용하여 slit-jet 버너에서 생성된 화염과 연소장 이미지를 획득하였으며, 후처리 과정을 통해 화염과 연소장의 구조변이를 면밀히 분석하였다. 그 결과, 수송기체 유량이 증가하면 연소반응이 촉진되어 연소반응영역이 신장되고, 반응온도가 증가하였다. 또한, 시간 변화에 따른 가시화염과 IR 연소장의 거동변화 비교를 통해 화염의 진동원인을 고찰하였으며, 화염면적의 FFT분석을 통해 생성화염의 진동주파수도 확인하였다.

Keywords

References

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