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PLIF를 이용한 가스터빈 연소기 버너부 연료 농도장 측정
전우진(Woo-jin Jeon),김형모(Hyung-mo Kim),이강엽(Kang-yeop Lee),양수석(Su-seok Yang) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
A Planar Laser Induced Fluorescence(PLIF) method was employed to measure the fuel concentration of the non-reacting field at the burner exit of DLN type gas turbine combustor. Experimental setup, image processing method and quantification method for fuel concentration used in this study were presented in this paper. Also, concentration measurement with gas analyzer was carried out to verify the propriety of the method used. The PLIF result coincides well with the gas analyzer measurement result. PLIF test results for several other conditions are mentioned as well.
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.
산화제 결핍 분위기에서의 층류 확산화염내 OH, PAHs 및 그을음 분포
심성훈,신현동,Shim, Sung-Hoon,Shin, Hyun-Dong 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.10
We investigate the flame behavior and spatial distribution of OH, PAHs and soot in a confined buoyant diffusion flame with decrease of the coflowing air flow rate. Direct photographs and Schlieren images represent that flame is Ally occupied by blue flame and becomes unstable, which is partially detached to the fuel nozzle tip in a near extinction flame under extremely reduced oxidizer condition. Laser induced fluorescence profiles clearly shows that OH is still generated in near-extinction flame, although intensity becomes weak with decreasing air flow rate. But soot scattering image cannot be seen any more in an oxidizer deficient ambience and simultaneously the PAHs are widely distributed downstream. These results are due to that a decrease of oxygen concentration in the combustion chamber leads to a temperature drop of flame, as a consequence, to a delay in soot growth and to a expanding of the PAHs, as soot precursors.
축방향 홈이 있는 Taylor-Couette 유동의 열전달 특성에 대한 연구
이상혁(Sang-Hyuk Lee),강인수(In-Su Kang),김형범(Hyoung-Bum Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Heat transfer characteristics of Taylor-Couette flow with the presence of axial slits were experimentally investigated by increasing the rotating Reynolds number. Axial slits were azimuthally located along the inner wall of the outer cylinder and the numbers of slits used in this study were 6, 9 and 18. The radius ratio and aspect ratio of experimental models were 0.825 and 48, respectively. We used the heating film warped around the inner cylinder for generating constant heat flux condition and maintained the constant temperature condition at the outer space of the outer cylinder. The temperature distribution and velocity fields in the annular space of the models were measured by using PLIF(planar laser induced fluorescence) and DPIV(digital particle image velocimetry) method.
직접분사식 가솔린 엔진에서 에탄올 혼합연료의 분무 및 연소특성
오희창(Heechang Oh),Wang Hua,오창훈(Changhoon Oh),박정서(Jungseo Park),배충식(Coongsik Bae) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
An experimental study was carried out to investigate the effect of ethanol concentration in ethanol blended gasolone on spray characteristics, engine performance and emissions in a single cylinder spray guided direct injection spark ignition engine. The planar laser induced fluorescence and planar Mie scattering macroscopic spray imaging were conducted using simulated fuel. Ethanol showed faster evaporation, enhanced local homogeneity and smaller liquid phase area near the spark plug. The For the engine experiment, it was shown that increased ethanol concentration in ethanol blened gasoline gives wider stratified combustion range in terms of injection timing due to faster evaporation, lower combustion instability and NOx emission due to enhanced local homogeneity and increased IMEP because additional retardation of injection is available.