http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
정길성(Kil Sung Jung),김화남(Hwanam Kim),성용하(Yongha Sung),최병철(Byungchul Choi),임명택(Myung Taeck Lim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
HCCI engines exhaust gas that contains THC and CO at a level comparable to the gasoline engines. Development of exhaust treatment devices like DOC's with high conversion efficiency especially at low temperature is therefore very important for commercialization of HCCI engines. Experimental DOC's are designed and fabricated in this study using 600 cpsi monolith, coated with either a L type or H type wash coat. Different amount of platinum is impregnated on the washcoat layers before canning and performance tests. Experimental results show that DOC's with low-temperature type wash coat have higher HC conversion efficiency at low exhaust gas temperature in comparison with those of high-temperature type wash co at and heavier Pt loading. DOC's with heavier Pt loading show higher HC conversion efficiency at exhaust temperature over 300℃. CO conversion is above 90 % on all types of DOCs as long as the exhaust temperature stays over 200 ℃.
성용하(Yongha Sung),임명택(Myung Taeck Lim),정길성(Kil Sung Jung),최병철(Byungchul Choi) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Compression ignition of homogeneous charges in IC engines proposes possibilities of achieving the high thermal efficiency of DI diesel engines with low level of NOx and particulate emissions of SI engines. The objectives of this study are to further understand the characteristics of the HCCI (Homogeneous charge compression ignition) combustion, and to find practical ways of extending the rich HCCI operation limit in an engine-like environment. DME fuel is supplied either in the form of premixture with air or directly injected in the combustion chamber of a rapid compression and expansion machine under the conditions of various equivalence ratio and injection timing. The cylinder pressure is measured and the rate of he at release is computed from the measured pressure for the analysis of the combustion characteristics. Exhaust emissions are analyzed by an FT-IR (Fourier transform infrared) and a CLD(Chemiluminescent Detector). The experimental data to date show that the RCEM operates without knock on mixtures of higher equivalence ratio and exhaust emissions reduced when DME is directly injected than inducted as perfect or nearly perfect premixture.
성용하(Yongha Sung),김화남(Hwanam Kim),정길성(Kil Sung Jung),임명택(Myung Taeck Lim),최병철(Byungchul Choi) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Exhaust treatment devices are added to the diesel engines as stricter regulations are introduced worldwide. The objectives of this study arc to further understand the characteristics of exhaust nanoparticles from a common-rail diesel engine equipped with DOC, DPF or CPF, and to analyze the effects of ultra-low sulfur diesel fuel on the particulate emissions. Diesel fuel with sulfur supplied in engine under the conditions of various equivalence ratio, fuel supply pressure and engine speed. The particle size distribution is measured by an SMPS to investigate the influences of sulfur content of the fuel, fuel injection pressure, fuel-air equivalence ratio, engine speed and load, types of exhaust treatment devices etc.
직분 방식 급속압축팽창기를 이용한 DME 균일 혼합기의 압축 착화 연소
성용하(Yongha Sung),정길성(Kil Sung Jung),임명택(Myung Taeck Lim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
Compression ignition of homogeneous charges in IC engines offers possibilities of maintaining the high efficiency of DI diesel engines with low level of NOx and particulate emissions. The objective of this study is to further understand the characteristics of the HCCI(Homogeneous charge compression ignition) combustion and to find ways of extending the rich HCCI operation limit in engine-like environment. DME is supplied either in the form of premixture or directly injected in the combustion chamber of a rapid compression and expansion machine under the conditions of various equivalence ratio and injection timing. The cylinder pressure is measured and the rate of heat release is computed from the measured pressure for the analysis of the combustion characteristics. The experiments show that the RCEM can operate without knock on mixtures of higher equivalence ratio, when DME is directly injected in the combustion chamber than introduced as a fraction of perfect or nearly perfect premixture. Very early fuel injection timings have only insignificant effects in control of ignition timing.
김재석(Jae Seok Kim),정길성(Kil Sung Jung),임명택(Myung Taeck Lim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Diesel particulate matter is one of the major harmful emissions under strict regulations. The exhaust after-treatment devices are added to the diesel engines as stricter regulations are introduced worldwide. In this study diesel particulate filters(DPF) were installed in the exhaust system of a common-rail diesel engine, and their PM-reducing performance was investigated under the steady state conditions. The PM emission levels with a plain DPF or catalyzed DPF (CDPF) were measured using a scanning mobility particle sizer and the conventional gravimetric method. It was observed that the size distribution of engine-out particles could be either mono-modal or bi-modal. Number of particles with diameter over 70㎚ decreased during passing through the DPF or CDPF in D-13 mode engine tests. But particles with diameter under 50㎚ increased inside the DPF or CDPF in certain parts of the engine test cycle. More than 90% by weight of PM contained in the engine exhaust disappeared after passing through the DPF or CDPF.
이중분사 기법을 이용한 DME-공기 혼합기의 압축 착화 시기 제어 연구
고영진(Youngjin Ko),정길성(Kil sung Jung),임명택(Myung Taeck Lim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Compression ignition of homogeneous charges in IC engines offers possibilities of maintaining the high efficiency of DI diesel engines without the high level of NOx and particulate emissions. The main objective of this study is to control the compression ignition timing of DME-air mixture for the HCCI combustion by dual injection technique in addition to extending the rich HCCI operation limit in an engine~like environment. DME compressed by 500bar is directly injected two times in the combustion chamber of a rapid compression and expansion machine. The pilot injection introduces fuel for a fixed equivalence ratio(Φ=0.1) at BDC timing, and the main injection delivers at various timing the rest of the fuel for the intended equivalence ratio. The cylinder pressure is measured, and the rate of heat release is computed for the analysis of the combustion characteristics. The experiments show that the compression ignition timing of DME-air mixture can be controled for the HCCI combustion without knock at the equivalence ratio up to 0.4 when DME is directly injected in dual mode.
디젤 연료의 황농도에 따라 배출되는 입자상물질의 산화촉매에서 반응특성
김화남(Hwanam Kim),성용하(Yongha Sung),정길성(Kil Sung Jung),강한용(Hanyong Kang),최병철(Byungchul Choi),임명택(Myung Taeck Lim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel particulate matters are one of a major harmful component of the emission under strict regulations. Diesel oxidation catalyst (DOC) is using to reduce hydrocarbon and carbon monoxide in current diesel engines. The objectives of this study are to further understand the formation characteristics of nano-particles in nuclei mode, for the purpose we examined formation of nano-particle with various sulfur concentrations in diesel fuel in both of a common-rail diesel engine and a boiler for household heating equiped with DOC. Experimental parameters adopted equivalence ratio, dilution air temperature, fuel injection pressure and engine speed. The particle size distribution and the number concentration were measured by SMPS. PM nano-particle number in boiler exhaust gas was increased by diesel fuel with 500 ppm sulfur, and when the exhaust gas temperature is more than 300℃, the particles range of 20 to 40 ㎚ increased greatly in the rear of the DOC. Number of the particle smaller than 30 ㎚ size increased as the sulfur concentration in the diesel fuel increased in the common-rail diesel engine.