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RISS 인기검색어
- 검색키워드
- 저자 : 이종근(Jong Guen Lee) (검색결과 7 건)
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모형 가스터빈 연소기에서의 연소 불안정 모드 분석에 관한 실험적 연구
이장수(Jangsu Lee),김민기(Min-ki Kim),박성순(Sungsoon Park),이종근(Jong-Guen Lee),윤영빈(Youngbin Yoon) 한국연소학회 2010 한국연소학회지 Vol.15 No.1
The main objective of this study was investigation of combustion instability characteristics in a lean partially premixed gas turbine dump combustor. Dynamic pressure transducers were located on combustor and inlet section to observe combustion pressure oscillation and difference at each measurement places. Also flame shape and CH* chemiluminescence were measured using a high speed ICCD camera. The combustor length was varied in order to have different acoustic characteristics from 800 to 1090 ㎜. The first section of this paper shows the stability map in model gas turbine combustor. And the effects of combustor length, mixture velocity in the mixing section and equivalence ratio were studied by the pressure perturbation and heat release oscillation. Also, the instability frequency and mode analysis were studied in last two sections. We observed two dominant instability frequencies in this study. Lower frequencies were obtained at lower equivalence ratio region and it was associated with a fundamental longitudinal mode of combustor length. Higher frequencies were observed in higher equivalence ratio conditions. It was related to secondary longitudinal mode of combustor and mixing section. In this instability characteristics, pressure oscillation of mixing section part was larger than pressure oscillation of combustor. As a result, combustion instability was strongly affected by acoustic characteristics of combustor and mixing section geometry.
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가스터빈 희박 예혼합 연소기에서의 화염의 동적 거동에 관한 연구
김대식(Daesik Kim),이종근(Jong Guen Lee),Domenic Santavicca 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
This paper describes the forced flame response in a turbulent premixed gas turbine combustor. The fuel was premixed with the air upstream of a choked inlet to avoid equivalence ratio fluctuations. To impose the inlet flow velocity, a siren type modulation device was developed using an AC motor, rotating and static plates. Measurements were made of the velocity fluctuation in the nozzle using hot wire anemometry and of the heat release fluctuation in the combustor using chemiluminescence emission. The test results showed that flame length as well as geometry was strongly dependent upon modulation frequency in addition to operating conditions such as inlet velocity. Convection delay time between the velocity perturbation and heat release fluctuations was calculated using phase information of the transfer function, which agreed well with the results of flame length measurements. Also, basic characteristics of the flame nonlinear response shown in the current test conditions were introduced.
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가스터빈 연소기 난류 비정상 화염으로부터의 화학발광 측정
김대식(Daesik Kim),이종근(Jong Guen Lee),Domenic Santavicca 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
The measurement of heat release rate is of great importance in the study of thermo-acoustic instability occurring in lean premixed combustion and the chemiluminescence emission has been used as an indicator of heat release in combustion instability studies primarily for its relative simplicity. This paper presents results of experimental study of flame chemiluminescence from an atmospheric, swirl-stabilized, turbulent lean premixed flame with a main emphasis on the effect of CO2* background level in the CH* and OH* band. The test results show that the effct of CO2* level in the CH* band is greater than that in the OH* band. Also, the background to peak ratio for both CH* and OH* bands can be expressed as a function of equivalence ratio, almost regardless of a change in the inlet velocity.
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가스터빈 연소기에서 CO₂<SUP>*</SUP> 배경 강도가 OH<SUP>*</SUP> 및 CH<SUP>*</SUP> 화학 발광 강도에 미치는 영향
김대식(Daesik Kim),이종근(Jong Guen Lee) 한국연소학회 2010 한국연소학회지 Vol.15 No.4
The measurement of heat release rate is of great importance in the study of thermo-acoustic instability occurring in lean premixed combustion and the chemiluminescence emission has been used as an indicator of heat release in combustion instability studies primarily for its relative simplicity. This paper presents results of experimental study of flame chemiluminescence from an atmospheric, swirl-stabilized, turbulent lean premixed flame with a main emphasis on the effect of CO₂<SUP>*</SUP> background level in the CH<SUP>*</SUP> and OH<SUP>*</SUP> band. The test results show that the effect of CO₂<SUP>*</SUP> level in the CH* band is greater than that in the OH<SUP>*</SUP> band. Also, the background to peak ratio for both CH* and OH* bands can be expressed as a function of equivalence ratio, almost regardless of a change in the inlet velocity.
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김대식(Daesik Kim),김기태(Kitae Kim),전승배(Seungbae Chen),이종근(Jong Guen Lee),Domenic Santavicca 한국연소학회 2008 한국연소학회지 Vol.13 No.2
An experimental study of the flame response in a turbulent premixed combustor has been conducted with room temperature, atmospheric pressure inlet conditions using premixed natural gas. The fuel is premixed with the air upstream of a choked inlet to avoid equivalence ratio fluctuations. Therefore the observed flame response is only the result of the imposed velocity fluctuations, which are produced using a variable speed siren. Measurements are made of the velocity fluctuation in the nozzle using hot wire anemometry and of the heat release fluctuation in the combustor using chemiluminescence emission. The results are analyzed to determine the phase and gain of the flame transfer function as a function of the modulation frequency. Of particular interest is the effect of flame structure on the flame response predictions and measurements. The results show that both the gain and the phase of flame transfer function are closely associated with the flame length and structure, which is dependent upon the upstream flow perturbation as well as equivalence ratio in the current study.
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덕트 형상 연소기의 연소불안정에 대한 Semi-Active Control
송재천(Jae-Cheon Song),송진관(Jin-Kwan Song),황정재(Jeong-Jae Hwang),윤영빈(Young-Bin Yoon),이종근(Jong-Guen Lee) 한국항공우주학회 2009 韓國航空宇宙學會誌 Vol.37 No.11
연소불안정현상은 주로 음향파와 열방출률 섭동간의 상호작용에 의해 발생한다고 알려져 있다. 이러한 현상은 헬름홀츠 공진기와 같은 수동제어기를 사용하여 감소시킬 수 있다. 그러나 헬름홀츠 공진기는 일반적으로 좁은 주파수대역에 대해서만 효과가 있는 단점을 가진다. 따라서 본 연구에서는 다양한 작동 범위에서 효과를 가질 수 있도록 피스톤을 사용하여 헬름홀츠 공진기의 부피를 변화시켜가며 연소불안정현상에 적용하였다. 그 결과 피스톤을 최적 위치인 40mm에 동조시킴으로써 연소 불안정 모드의 진폭을 크게 감소시킬 수 있었다. 그리고, 연소기와 헬름홀츠 공진기 사이의 동압의 위상차가 흥미로운 관계에 있음을 나타내었다. 또한 헬름홀츠 공진식과 위상차를 이용한 능동적으로 동조되는 수동제어방식에 대해 알아보았다. Combustion Instabilities are caused by a coupling between acoustic waves and unsteady heat release. They can be eliminated using passive controller such as a Helmholtz resonator. But, Helmholtz resonator is normally only effective over a narrow frequency range. In this work, Helmholtz resonator is applied for reducing the combustion oscillations and we vary the Helmholtz resonator volume using piston in oder to tune in the wide range of operating conditions. As the result, it is found that the dominant combustion oscillations can be largely reduced by optimizing the size of resonator volume. And, interesting relation for phase difference of dynamic pressure both combustor and the helmholtz resonator are presented in this paper. Also, we investigate semi-active control using Helmholtz equation and phase difference.
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