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폐음향 경계조건을 갖는 가스터빈 연소기의 연소불안정 해석
차동진(Dong-Jin Cha),신동명(Dong-Myung Shin) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.3
Combustion instability is a major issue in design of gas turbine combustors for efficient operation with low emissions. Combustion instability is induced by the interaction of the unsteady heat release of the combustion process and the change in the acoustic pressure in the combustion chamber. In an effort to develop a technique to predict self-excited combustion instability of gas turbine combustors, a new stability analysis method based on the transfer matrix method is developed. The method views the combustion system as a one-dimensional acoustic system with a side branch and describes the heat source as the input to the system. This approach makes it possible to use not only the advantages of the transfer matrix method but also well established classic control theories. The approach is applied to a gas turbine combustion system, which shows the validity and effectiveness of the approach.
선회 안정화된 화염의 자발광 이미지를 아벨 역변환하기 위한 매트랩 스크립트
차동진(Dong-Jin Cha),신동명(Dong-Myung Shin) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
Chemiluminescence images of radicals including OH<SUP>*</SUP> are widely used in combustion research. The images consist of line-of-sight integrated projection data. To better characterize the field, for example, OH<SUP>*</SUP> radical distribution in a combustion zone, the images need to be deconvoluted. One of promising deconvolution techniques is the Abel inversion. In this work, a matlab script has been written to perform the inversion, based on the algorithm in Ref. 4, and tested. Some intermediate results in the work have been compared with those in the reference, and they agree well. Then, an averaged chemiluminescence image taken an atmospheric pressure gas turbine combustion rig has been deconvoluted with the script successfully. The deconvoluted image is used to visualize the corresponding flame structure, and the code is being used for combustion instability study for triple annular research swirler (TARS) gas turbine combustor.
차동진(Dong-Jin Cha),신동명(Dong-Myung Shin) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Combustion instability is a major issue in design of co-generation gas turbine combustors for efficient operation with low emissions. Combustion instability is induced by the interaction of the unsteady heat release of the combustion process and the change in the acoustic pressure in the combustion chamber. In an effort to develop a technique to predict self-excited combustion instability of co-generation gas turbine combustors, a new stability analysis method based on the transfer matrix method is developed. The method views the combustion system as a one-dimensional acoustic system with a side branch and describes the heat source as the input to the system. This approach makes it possible to use not only the advantages of the transfer matrix method but also well established classic control theories. The approach is applied to a simple co-generation gas turbine combustion system, which shows the validity and effectiveness of the approach.
온라인 개방코드 OSCILOS를 이용한 모델 희박 예혼합 가스터빈 연소기의 연소불안정 해석 사례
차동진(Dong Jin Cha),송진관(Jin Kwan Song),이종근(Jong Geun Lee) 한국연소학회 2015 한국연소학회지 Vol.20 No.4
Combustion instability is a major issue in design and maintenance of gas turbine combustors for efficient operation with low emissions. With the thermoacoustic view point the instability is induced by the interaction of the unsteady heat release of the combustion process and the change in the acoustic pressure in the combustion chamber. In an effort to study the combustion dynamics of gas turbine combustors, Morgans et al (2014) have developed OSCILOS (open source combustion instability low order simulator) code and it is currently available online. In this study the code has been utilized to predict the combustion instability of a reported case for lean premixed gas turbine combustion, and then its prediction results have been compared with the corresponding experimental data. It turned out that both the predicted and the experimental combustion instability results agree well. Further the effects of some typical inlet acoustic boundary conditions on the prediction have been investigated briefly. It is believed that the validity and effectiveness of the open source code is reconfirmed through this benchmark test.
Reduction of Raman Spectroscopy Data for H₂-CO₂-Air Tubular Flame Measurements
Dong Jin Cha(차동진),Darren C. Tinker,Carl A. Hall,Robert W. Pitz 한국연소학회 2022 한국연소학회지 Vol.27 No.2
An approach of reducing spontaneous Raman spectroscopy data, based on the matrix inversion method which logically removes undesired sources of the Raman scattering signals including cross-talk due to the signals from other species, is discussed. The approach contains extensive calibration of temperature-dependent system response. The Raman spectra of several cold and hot calibration flames and their resulting calibration matrix are elaborated. The structure of H₂-CO₂-air tubular flames, in terms of major species (CO₂, O₂, N₂, H₂O, and H₂) concentrations and temperature, was successfully measured with the optical technique. The Raman spectra data used in this study are taken from a uniquely designed experimental apparatus – a tubular burner and Raman spectroscopy system at Vanderbilt University. The characteristic uncertainties for chemical species are approximately ±2% by mole fraction for hot products and ±0.5% for room temperature reactants. The approach described here for hydrogen/air tubular flames may be adapted to hydrocarbon/air tubular flames when other necessary major species, for example, CH₄ and CO for methane/air tubular flame, are considered in the whole process.
[ CO/H<sub>2</sub>/Air ] 예혼합 화염에 대한 준총괄 화학반응 메커니즘
장경,차동진,주용진,이기용,Jang, Kyoung,Cha, Dong-Jin,Joo, Yong-Jin,Lee, Ki-Yong 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.2
A reduced chemical kinetic mechanism is developed in order to predict the flame phenomena in premixed $CO/H_2/Air$ flames at atmospheric pressure, aimed at studying the coal gas combustion for the IGCC applications. The reduced mechanism is systematically derived from a full chemical kinetic mechanism involving 11 reacting species and 66 elementary reactions. This mechanism consists of four global steps, and is capable of explicitly calculating the concentration of 7 non-steady species and implicitly predicting the concentration of 3 steady state species. The fuel blend contains two fuels with distinct thermochemical properties, whose contribution to the radical pool in the flame is different. The flame speeds predicted by the reduced mechanism are in good agreement with those by the full mechanism and experimental results. In addition, the concentration profiles of species and temperature are also in good agreement with those by the full mechanism.
강필순,차동진,정재화,서석빈,안달홍,Kang Feel-Soon,Cha Dong-Jin,Chung Jae-Hwa,Seo Seok-Bin,Ahn Dal-Hong 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.6
본 논문에서는 LabVIEW 기반의 가스터빈 데이터 취득 및 모니터링 시스템을 제안한다. C-Tune DAS로 명명된 실시간 모니터링 시스템은 가스터빈의 유지/보수시 실시간 동작을 분석하는데 중요한 역할을 담당한다. LabVIEW 소프트웨어는 고유 기능별로 데이터 취득부, 데이터 분석 및 표시부, 데이터 저장부로 구성된다. 데이터 취득부를 통해 PMS 서버와 두 대의 cFP로부터 데이터를 취득한다. 복합화력 발전소의 상용 가스터빈에 적용하여 개발된 모니터링 시스템의 타당성을 검증한다. This paper presents a gas turbine data acquisition and monitoring system using a LabVIEW programming. The developed real-time monitoring system entitled a C-Tune DAS Plays an important role to make an analysis of the real-time operation of the gas turbine under maintenance. the LabVIEW based software is divided into three parts according to their original functions; Data acquisition, Data analysis and display, and Data storage. The data acquisition part receives data from a PMS (Plant Management System) server and two cFPs (Compact-Field Point). To verify the validity of the developed system, it is applied to gas turbines in the combined cycle power plant in Korea.
발열체와 부분 열림 수직벽을 갖는 사각 공간 내 자연대류 특성 해석
심동식,강보선,차동진,주원종,Sim, Dong-Sik,Gang, Bo-Seon,Cha, Dong-Jin,Ju, Won-Jong 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.12
Natural convection heat transfer in an enclosure with an opening in the right veritcal wall and a heat source at the bottom surface is investigated using a holographic interferometric technique. The effects of the opening length, divider length attached to the top wall, and heater temperature on the temperature distribution are examined. The opening length as well as the divider length greatly affects the degree of inflow and outflow of air. In the case of small opening length, the opening doesnt affect much the upward warm air flow resulting in the symmetric temperature distribution .The upward flow in hindered by the divider resulting in the decrease of heat transfer from the heater region to the upper region. The longest divider shows the highest temperature in the lower region of enclosure. In the case of large opening length, the inward cold flow moves the upward flow to the left direction. Among the cases of different divider length, the case of H(sub)d=0.25H shows the highest temperature in the lower region of enclosure.