Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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Effect of a Preprocessing Method on the Inversion of OH* Chemiluminescence Images Acquired for Visualizing SNG Swirl-stabilized Flame Structure

SNG 선회 안정화 화염구조 가시화를 위한 OH* 자발광 이미지 역변환에서 전처리 효과

  • Ahn, Kwang Ho (Graduate School, Department of Building and Plant Engineering, Hanbat National University) ;
  • Song, Won Joon (Institute for Fusion Technology for Production, Hanbat National University) ;
  • Cha, Dong Jin (Department of Building and Plant Engineering, Hanbat National University)
  • 안광호 (한밭대학교 설비공학과 대학원) ;
  • 송원준 (한밭대학교 생산융합기술연구소) ;
  • 차동진 (한밭대학교 설비공학과)
  • Received : 2014.12.31
  • Accepted : 2015.02.02
  • Published : 2015.03.30
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Abstract

Flame structure, which contains a useful information for studying combustion instability of the flame, is often quantitatively visualized with PLIF (planar laser-induced fluorescence) and/or chemiluminescence images. The latter, a line-integral of a flame property, needs to be preprocessed before being inverted, mainly due to its inherent noise and the axisymmetry assumption of the inversion. A preprocessing scheme utilizing multi-division of ROI (region of interest) of the chemiluminescence image is proposed. Its feasibility has been tested with OH PLIF and $OH^*$ chemiluminescence images of SNG (synthetic natural gas) swirl-stabilized flames taken from a model gas turbine combustor. It turns out that the multi-division technique outperforms two conventional ones: those are, one without preprocessing and the other with uni-division preprocessing, reconstructing the SNG flame structure much better than its two counterparts, when compared with the corresponding OH PLIF images. It is also found that the Canny edge detection algorithm used for detecting edges in the multi-division method works better than the Sobel algorithm does.

Keywords

References

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