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DPF 성능 평가를 위한 Dump Combustor의 활용
남연우(Youn Woo Nam),이원남(Wonnam Lee),오광철(Kwang Chul Oh),이춘범(Chun Beom Lee) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 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. The Diesel Particulate Filter (DPF) system is considered as the most efficient method to reduce particulate matter (PM), but the improvement of a regeneration performance at any engine operation point presents a considerable challenge by itself. Temperature, gas compostion and flow rate of exhaust gas are important parameters in DPF evaluation, especially regeneration process. Engine dynamometer and degment tester are generally used in DPF evaluation so far. But these test method couldn't reveal the effect of various parameters on real DPF, such as O2 concentration, amount of soot and exhaust gas temperature. This research has studied the possibility using dump combustor that used to take an approach lean premixed combustion in gas turbine for a DPF power and optimized. It is possible that utilize the system as DOC (Diesel Oxidation Catalyst) and SCR(Selective Catalytic Reduction) assessments test as well as DPF evaluation
Modulated LII 신호와 이색법을 이용한 매연입자 온도 계측
남연우(Youn Woo Nam),이원남(Wonnam Lee) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
A new measurement technique based on a two-color pyrometry and modulated LⅡ signals to measure local soot particle temperatures has been proposed and examined experimentally. The theoretical review suggests that modulated LⅡ signals of soot particles is suitable for a two-color pyrometry as long as the temperature increase due to laser heating remains relatively small. The modulated LⅡ signals from ethylene and propylene diffusion flames were simultaneously measured at 550 and 750 ㎚ by a dual measurement system that consists of optical fibers, PMT and lock-in amps. The local soot particle temperatures of diffusion flames could be obtained using a two-color pyrometry and modulated LⅡ signal based new technique.
후처리장치 성능 평가를 위한 Dump Combustor의 활용
남연우(Youn Woo Nam),이원남(Wonnam Lee),오광철(Kwang Chul Oh),이춘범(Chun Beom Lee) 한국연소학회 2007 한국연소학회지 Vol.12 No.3
Employing an after-treatment system has almost become a mandatory requirement for Diesel vehicles, which results from a reinforced exhaust regulations as the number of vehicles powered by a Diesel engine increases. The Diesel Particulate Filter (DPF) system is considered as one of the most efficient method to reduce particulate matter (PM); however, the improvement of a regeneration performance at any engine operation point presents a considerable challenge by itself. Temperature, gas composition and flow rate of exhaust gas are important parameters in DPF evaluation processes, especially during a regeneration process. Engine dynamometer and segment tester are generally used in DPF evaluation so far. These test methods, however, could not completely evaluate the effect of various parameters on real DPF, such as oxygen concentration, amount of soot and exhaust gas temperatures. The evaluation of DPF systems using a dump combustor has been verified experimentally and this dump combustor system is likely to be appropriate for the DOC (Diesel Oxidation Catalyst) and SCR (Selective Catalytic Reduction) assessments test, too.
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.
이원남(Wonanm Lee),남연우(Youn Woo Nam) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The soot formation and oxidation characteristics of methane diffusion flames have been experimentally studied at the pressures from 0.2MPa to 0.4AMP. The measured spatially resolved soot volume fraction distributions indicated that there is a significant pressure effect during the soot formation process while the effect of pressure is relatively less obvious for the soot oxidation process. The increase of fuel concentration with pressure might be most responsible for the enhancement of soot formation through the pyrolysis and gas-phase reactions during a soot formation process. On the contrary, the decrease in oxygen diffusion velocity and the surface reactions during a soot oxidation process is the most likely to be responsible for the relatively small effect of pressure on it. The further information of soot panicle size. PAH concentration distribution and soot temperature will be experimentally obtained in the further in order to better understand the pressure effect.<br/>
매연입자의 LII 신호를 이용한 층류확산화염 유동속도 측정
이정수(Jung Soo Lee),남연우(Youn Woo Nam),이원남(Wonnam Lee) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
A new technique utilizing LⅡ signal for the measurement of flow velocities of laminar diffusion flames has been investigated. Soot particles in ethylene diffusion flames are heated by a modulated Ar-ion laser beam. LⅡ signals and their phase angles are measured using a lock-in amplifier at the different flame heights and the axial flow velocity are obtained from the measured phase angle delay. The measured velocities are similar to those from LDV measurements under the same operating conditions. The effects of laser power, LⅡ signal wavelength, and modulation frequency are not sensitive to the velocity measurement. However, the choice of an optical chopper blade type could affect the measurement result. The use of a 6/5 chopper blade showed the better result that is possibly due to the square shape of modulated laser beam. This study successfully demonstrated that axial flow velocities of laminar diffusion flames can be measured by a new technique utilizing LⅡ signal, which does not need particle seeding unlikely to LDV or PIV techniques.