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실험적으로 측정된 화염전달한수를 활용한 부분 예혼합 화염의 연소불안정 예측
인병구(Byunggu In),송원준(Wonjoon Song),차동진(Dongjin Cha) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
본 연구에서는 모사 석탄가스를 연료로 사용한 부분 예혼합 모델 가스터빈 연소기에서 측정한 화염전달함수 데이터를 분석하여 기존의 예혼합 화염에서 주로 사용한 2차 필터 모델(2nd order filter model)이 아닌, 다항식전달함수(polynomial transfer function)로 곡선접합을 시도하였다. 현재 곡선접합한 화염전달함수 결과를 활용하여 해당 부분 예혼합 모델 연소기의 연소불안정을 예측하고 있다. In this study, flame transfer function data, measured from a model partially-premixed gas turbine combustor burning synthetic coal-derived gas, has been analyzed and curve-fit by using the polynomial transfer function model rather than the 2<SUP>nd</SUP> order filter model that is frequenly employed for that of the lean premixed flame. The curve-fitted flame transfer function has further imported into a lumped network prediction model, and the combustion instability of the partially-premixed flame is being predicted and will be reported.
안광호(Kwangho Ahn),송원준(Wonjoon Song),차동진(Dongjin Cha) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.12
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<SUP>*</SUP> 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.
발전용 가스터빈의 연소진동 측정용 소프트웨어 개발 및 적용
정재화(Jaehwa Chung),서석빈(Seokbin Seo),이민철(Mincheol Lee),안달홍(Dalhong Ahn),차동진(Dongjin Cha) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The object of the present paper is to introduce the combustion oscillation measurement software system developed by KEPRI(Korea Electric Power Research Institute) and to show application examples used to measure combustion dynamics in the DLN gas turbines on site in Korea. The software system was implemented with a commercial general purpose DASYLab version 6.0 code which can be operated under MS Windows environment. The developed software system has many important key functions such as acquisition of combustion dynamic pressure signals, the FFT analysis, time analysis, and displaying and saving the measured data.