Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Effects of Driving Frequency on Propagation Characteristics of Methane-Air Premixed Flame Influenced by Ultrasonic Standing Wave

정상초음파의 교란을 받는 메탄-공기 예혼합화염의 전파특성에 대한 초음파 구동 주파수의 영향

  • Received : 2014.07.02
  • Accepted : 2014.11.04
  • Published : 2015.02.01
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Abstract

An experimental study was conducted to scrutinize the influence of the frequency of an ultrasonic standing wave on the variation in the behavior of a methane-air premixed flame. The evolutionary features of the propagating flame were captured by a high-speed camera, and the macroscopic flame behavior, including the flame structure and local velocities, was investigated in detail using a post-processing analysis of the high-speed images. It was found that a structural variation and propagation-velocity augmentation of the methane-air premixed flame were caused by the intervention of the ultrasonic standing wave, which enhanced the combustion reaction. Conclusive evidence for the dependency of the flame behaviors on the driving frequency of the ultrasonic standing wave and equivalence ratio of the reactants is presented.

정상초음파장의 구동 주파수가 메탄-공기 예혼합화염의 전파특성에 미치는 영향을 규명하고자 하는 실험결과를 제시한다. 고속카메라를 이용하여 화염의 전파영상을 획득하였으며, 영상 후처리를 통해 화염선단의 구조와 속도변이를 포함하는 화염의 거시적 거동을 상세히 관찰하였다. 정상초음파가 연소반응을 촉진시켜 화염 전파속도의 증대와 화염선단 구조의 변이를 유발한다는 사실에 더하여, 초음파구동 주파수와 당량비에 대한 화염거동의 종속성을 확인하였다.

Keywords

References

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  1. Frequency-Equivalence Ratio Correlation Analysis of Methane-Air Premixed Flame Influenced by Ultrasonic Standing Wave (I) vol.19, pp.4, 2015, https://doi.org/10.6108/KSPE.2015.19.4.037