Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Effect of a Preprocessing Method on Inverting Chemiluminescence Images of Flames Burning Substitute Natural Gas

대체천연가스 화염 이미지 역변환에서 전처리 효과

  • Ahn, Kwangho (Dept. of Building & Plant Engineering, Graduate School, Hanbat National University) ;
  • Song, Wonjoon (Institute for Fusion Technology for Production, Hanbat National University) ;
  • Cha, Dongjin (Dept. of Building and Plant Engineering, Hanbat National University)
  • 안광호 (한밭대학교 설비공학과 대학원) ;
  • 송원준 (한밭대학교 생산융합기술연구소) ;
  • 차동진 (한밭대학교 설비공학과)
  • Received : 2015.06.14
  • Accepted : 2015.10.19
  • Published : 2015.12.10
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Abstract

A preprocessing scheme utilizing multi-division of the ROI (region of interest) in a chemiluminescence image during inversion is proposed. The resulting inverted image shows the flame's structure, which can be useful for studying combustion instability. The flame structure is often quantitatively visualized with PLIF (planar laser-induced fluorescence) images as well. The chemiluminescence image, which is a line-integral of the flame, needs to be preprocessed before inversion, mainly due to the inherent noise and the assumption of axisymmetry during the inversion. The feasibility of the multi-division preprocessing technique has been tested with experimentally-obtained OH PLIF and $OH^*$ chemiluminescence images of jet and swirl-stabilized flames burning substitute natural gas (SNG). It turns out that the technique outperforms two conventional methods, specifically, the technique without preprocessing and the one with uni-division, reconstructing the SNG flame structures much better than its two counterparts when compared using corresponding OH PLIF images. The characteristics of the optimum degree of polynomials to be applied for curve-fitting of the flame region data for the multi-division method involving two flames has also been investigated.

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References

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