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RISS 인기검색어
- 검색키워드
- 저자 : Inchan Choi(Inchan Choi) (검색결과 105 건)
- 무료
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PLIF 및 자발광 계측을 이용한 이중선회 가스터빈 연소기에서 연소불안정 모드 연구
Choi, Inchan,Lee, Keeman,Juddoo, Mrinal,Masri, A.R. 한국연소학회 2014 한국연소학회지 Vol.19 No.1
This paper described an experimental investigations of combustion instability mode in a lean premixed dual swirl combustor for micro-gasturbine system. When such the instability occurs, a strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave which results in a loud, annoyed sound and may also lead a structural damage to the combustion chamber. The detailed period of flame behavior and heat release in combustion instability mode have been examined with high speed OH and CH-PLIF system and $CH^*$ chemiluminescence measurement, flame tomography with operated at 10 kHz and 6 kHz each. Experiment results suggest that unstable flame behavior has a specific frequency with 200 Hz and this frequency is accords with about 1/2 sub-harmonic of combustor resonance frequency, not fundamental frequency. This is very interesting phenomenon that have not reported yet from other previous works. Therefore, when a thermo-acoustic instability with Rayleigh criterion occurs, the fact that the period of heat release and flame behavior are different each other was proposed for the first time through this work.
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전기 자동차용 이산화탄소 열펌프 시스템의 냉난방 능력평가
최인찬(Inchan Choi),송준호(Junho Song),김영일(Youngil Kim),최종민(Jongmin Choi),이기만(Keeman Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Heat pump system using CO₂ refrigerant was designed to develop a new air-conditioning system of an electric vehicle because there is no any other heating source like a IC engine for electric vehicles or fuel cell vehicles. In this paper, the indoor heat exchanger(evaporator for a cooling mode and gas cooler for a heating mode) of the heat pump system was analyzed. The heating capacity was compared with the cooling capacity for various operating conditions such as different compressor speed, outdoor inlet fontal air velocities, air flow rates and temperatures passing through an indoor heat exchanger using the precision CO₂ calorimeter. The experimental results can be used to evaluate the effect of system design changes on system performance as well as the development of a highly efficient heat pump system.
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PLIF를 이용한 이중 선회 가스터빈 연소기의 과도 및 불안정 모드 연구
최인찬(Inchan Choi),이기만(Keeman Lee),A.R. Masri 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
This paper described experimental investigations of the transition and instability mode in a lean premixed dual swirl combustor. Strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave which results in a loud, annoyed sound and may also lead to a structural damage to the combustion chamber. Heat release analysis in instability and transition mode has been examined with OH and CH-PLIF system. flame tomography with operated at 10kHz. Experiment results suggest that unstable flame behavior has a specific frequency with 200Hz and this frequency is accords with 1/2 subhamonic of resonance frequency, not fundamental frequency. Also, it is confirmed that the combustion instability is strongly related to the CIVB phenomenon.
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전기 자동차용 이산화탄소 열펌프 시스템의 열교환기 성능평가
최인찬(Inchan Choi),김영일(Youngil Kim),최종민(Jongmin Choi),이기만(Keeman Lee) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.5-2
Heat pump system using CO2 refrigerant was designed to develop a new air-conditioning system of an electric vehicle because there is no any other heating source like a IC engine for electric vehicles or fuel cell vehicles. In this paper, the heat exchanger of the heat pump system was analyzed. The heat exchanger performance was evaluated to various operating conditions such as different compressor speed, outdoor inlet frontal air velocities, air flow rates and temperatures passing through an heat exchanger using the precision CO2 calorimeter. The experimental results can be used to evaluate the effect of system design changes on system performance as well as the development of a highly efficient heat pump system.
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이중 선회 가스터빈 연소기에서 연소 불안정 주기에 관한 실험적 연구
최인찬(Inchan Choi),이기만(Keeman Lee),A.R. Masri 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
본 연구는 이중선회 가스터빈 희박연소기에서 연소 불안정성에 대한 실험적인 연구이다. 연소기의 큰 손상 및 소음을 야기 시키는 연소기내에서 연소 불안정 발생은 압력파와 열방출 간의 상호작용에 의하여 유발되는 것으로 알려져 있다. 연소 불안정 현상을 규명하기 위하여 당량비 변화에 따른 CH 및 OH-PLIF (10kHz)를 통해 열 방출에 대한 정보를 얻었으며, 연소실의 음향파를 측정하여 연소실에서 압력변화에 대해 파악했다. 그 결과 불안정한 화염영역에서 화염 거동이 200Hz의 일정한 주기를 가지고 있음을 확인하였으며, 그 주기는 연소실의 길이에 의존되는 연소실 공명 주파수의 1/2 subhamonic 주기와 일치하는 것을 확인하였다. This parer described experimental investigations of the unsteady in a lean premixed dual swirl gas turbine combustor. Strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave which results in a loud, annoyed sound and may also lead to a structural damage to the combustion chamber. Heat release period in region of combustion instability has been examined with OH and CH-PLIF system, flame tomography and PLIF operated at 10kHz. Experiment results suggest that unstable flame behavior has a specific frequency with 200Hz and this frequency is accords with 1/2 subhamonic of resonance frequency.
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PLIF 및 자발광 계측을 이용한 이중선회 가스터빈 연소기에서 연소불안정 모드 연구
최인찬(Inchan Choi),이기만(Keeman Lee),Mrinal Juddoo,A.R. Masri 한국연소학회 2014 한국연소학회지 Vol.19 No.1
This paper described an experimental investigations of combustion instability mode in a lean premixed dual swirl combustor for micro-gasturbine system. When such the instability occurs, a strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave which results in a loud, annoyed sound and may also lead a structural damage to the combustion chamber. The detailed period of flame behavior and heat release in combustion instability mode have been examined with high speed OH and CH-PLIF system and CH<SUP>*</SUP> chemiluminescence measurement, flame tomography with operated at 10 ㎑ and 6 ㎑ each. Experiment results suggest that unstable flame behavior has a specific frequency with 200 ㎐ and this frequency is accords with about 1/2 sub-harmonic of combustor resonance frequency, not fundamental frequency. This is very interesting phenomenon that have not reported yet from other previous works. Therefore, when a thermo-acoustic instability with Rayleigh criterion occurs, the fact that the period of heat release and flame behavior are different each other was proposed for the first time through this work.
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