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산소 부화가 초기 매연의 체류 시간에 따른 탄소화 과정에 미치는 영향
정용진(Yongjin Jung),오광철(Kwang Chul Oh),배충식(Choongsik Bae),신현동(Hyun Dong Shin) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
The carbonaceous process of incipient soot particles according to the residence time was investigated in a inverse diffusion flame with oxygen enrichment. Two-color-ratio pyrometry was used to measure the soot temperature. It revealed that the soot temperature corresponding to the maximum signal through 700 ㎚ band-pass filter remained between 2000 K and 2200 K below the flame height, which obtained from OH-Planar laser induced fluorescence. The C/H ratio, which is good quantitative indicator to judge the degree of carbonization, was strongly affected by the modified residence time. The modified residence time indicates conversion of the height from the beginning position of the yellow flame to the position corresponding to the temperature of 1600 K above the flame height.
오광철(Kwang Chul Oh),서충길(Chung gil Seo),고상철(Sang Chul Ko),이춘범(Chun Beom Lee),김덕진(Deok Jin Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The performance of diesel engine is more excellent than gasoline engine"s in terms of a fuel efficiency and durability so that it can be applied to a heavy duty commercial vehicle. However, the NOx and PM emitted from the diesel engine are remained to overcome and its regulation is reinforced recently. To this reason DPF system are becoming more common from Euro-4 regulation and effective DeNOxsystem is required for satisfying future regulation. Urea-SCR in these DeNOx system is emerging as the best solution in commercial vehicle. This technique is well known since several years and derived from the exhaust gas treatment of power plants and stationary engines. Honeycomb shaped catalysts(coated catalyst) based on titanium dioxide containing active component are used predominantly. In this paper extrusive SCR catalyst without inactive support substrate is introduced and compared with coating catalyst in DeNOx performance.
DPF test rig를 이용한 SiC DPF의 특성 평가
오광철(Kwang Chul Oh),남연우(Youn Woo Nam),이천환(Chunhwan Lee),이춘범(Chunbeom Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The number of vehicles employing diesel engines is rapidly rising. Accompanying this trend, application of an after-treatment system is strictly required as a result of reinforced exhaust regulations. As Diesel Particulate Filter (DPF) system is considered as the most efficient method to reduce particulate matter (PM), many automotive makers spend a lot of time to select, evaluate and adapt DPF system. Temperature, gas composition and flow rate of exhaust gas are important parameters in DPF evaluation, especially regeneration process. Engine dynamometer and segment tester are generally used in DPF evaluation, but these test methods can't reveal the effect of various parameters on real size DPF, such as O₂ concentration, amount of soot and exhaust gas temperature. Therefore in this study, DPF test Rig using diesel burner was devised to facilitate DPF evaluation at various parameters systematically and the results of two representative applications(thermal cycling and unconditional regeneration) were presented.
층류 비예혼합 분류화염에서 음향가진에 의한 유동특성 연구
오광철(Kwang Chul Oh),이기만(Kee Man Lee) 한국항공우주학회 2010 韓國航空宇宙學會誌 Vol.38 No.2
공명 주파수의 음파로 가진된 비예혼합 분류화염에서 가진 강도에 대한 영향을 실험적으로 조사하였다. 이를 위해 Mie 산란광 단면법, PLIF, PIV 등 광학적 가시화 방법이 사용되었다. 가진된 분류화염의 부상경로는 연료유량 및 가진 강도에 따라 크게 세 가지 영역으로 구분되는데, 비교적 큰 가진 강도에서 부상될 때 화염기저가 마치 난류화염처럼 부상되는 영역I과 작은 가진 강도에서 쉽게 부상되는 영역II 그리고 이 두 영역들 사이에서 부상된 화염기저가 부분 예혼합의 분젠화염과 같은 형태로 과도기적 영역이 존재함을 알았다. 본 연구에서는 영역I과 II로 구분되는 부상경로 차이에 대한 이해를 높이고자 가진 위상에 따른 노즐과 화염기저간의 유동 혼합과 속도 분포 특성을 아세톤 PLIF와 PIV 시스템을 사용하여 조사하였다. An experimental study has been conducted to investigate the effects of forcing amplitude on the tone-excited non-premixed jet flame of the resonance frequency. Visualization techniques are employed using the laser optic systems, which are RMS tomography, PLIF and PIV system. There are three lift-off histories according to the fuel flow rates and forcing amplitudes; the regime I always has the flame base feature like turbulent flame when the flame lift-off, while the flame easily lift-off in the regime II even if a slight forcing amplitude applied. The other is a transient regime and occurs between the regime I and regime II, which has the flame base like the bunsen flame of partial premixed flame. In the regime I and II, the characteristics of the mixing and velocity profile according to the forcing phase were investigated by the acetone PLIF, PIV system. Particular understanding is focused on the distinction of lift-off history in the regime I and II.