http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
금속폼 DPF 필터의 발생 배압 예측을 위한 실험적 연구
오정교(Jungkyo Oh),이정민(Jeongmin Lee),이의성(Euisung Lee),박만호(Manho Park),오권오(Kwonoh Oh),이병하(Byungha Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
DPF is widely used to follow the emission regulation which is getting more stricter. The pressure drop by DPF is needed to be considered for design of DPF. In this study, the permeability and the forrchheimer coefficient which influence the pressure drop by metal foam filter will be decided through experiments. And this result will be applied to CFD analysis in order for introducing design elements for DPF through testing the permissible pressure of DPF
경유중 황성분이 Metal Foam 필터의 성능에 미치는 영향
이상수(Sangsu Lee),오권오(Kwonoh Oh),이의성(Euisung Lee),김홍석(Hongsuk Kim),정용일(Yongil Jung),조규백(Gyubaek Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The effects of sulfur contents on the performance of the metal foam DPF (Diesel Particulate Filter) were investigated. The metal foam, INCOFOAM? High Temp, was axially stacked in the exhaust pipe to reduce PM emissions. LSD (Low Sulfur Diesel) fuel which has sulfur content of about 300 ppm and ULSD (Ultra Low Sulfur Diesel) fuel which has sulfur content of below 50 ppm were used to compare the emissions. When the DOC (Diesel Oxidation Catalyst) was installed upstream of DPF and the LSD fuel was used, the PM reduction rates at high exhaust temperature were deteriorated because the DOC oxidized sulfur dioxide at high exhaust temperature which eventually forms sulfate particles during dilution. With DOC, BPT (Balance Point Temperature) was lowered from 420℃ to 360℃ due to the NO₂ formation inside the DOC, which is favorable for the DPF regeneration. Accordingly, when ULSD was used, the combination of DOC and DPF showed PM reduction rate of 70% and relatively low pressure difference across DPF, which are acceptable performance for DPF.
금속폼 DPF의 Clean Filter 성능에 관한 연구
Khai Nguyen(Khai Nguyen),권오채(Oh Chae Kwon),성낙원(Nakwon Sung),조규백(Gyubaek Cho),오권오(Kwonoh Oh),이의성(Euisung Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Pressure drops in metallic foam diesel particulate filters (DPFs) were experimentally and computationally studied in order to understand effects of various design parameters on the fundamental clean filter performance. Axial type filters of Nickel-based super alloy (Inconel) foam, which is a new valuable medium for DPFs due to lower cost, higher temperature corrosion, light-weight. ductility and design flexibility compared to conventional honeycomb wall-flow monoliths, were considered for volume flow rates of 500 to 3000 1/min, filter thickness of 25 to 50 ㎜, pore size of 450 to 600 ㎛, and inlet cone angles of 0 to 50. Predicted and measured pressure drops for the various conditions agreed well each other, indicating that the present modeling using a 3-dimensional CFD code combined with a porous media model can provide reliable predictions.
김진현(Jinhyun Kim),차경옥(Kyongok Cha),오권오(Kwonoh Oh),김홍석(Hongsuk Kim),정용일(Youngil Jeong),조규백(Gyubaek Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Axial type metal foam filters were investigated to determine the feasibility as DPF filters and to prove PM reduction performance in last study. In this study, several kinds of metal foam filters with various mean pore sizes were evaluated for the characteristics such as pressure drop and PM reduction rates in mass and number density. Metal foam plates were axially stacked in the can which was installed in the exhaust pipe. All tests were performed in engine bench varying engine rpm and load which correspond to the real vehicle velocity conditions. Filters with small mean pore diameter showed high PM reduction rates in both the mass and the number density with higher pressure difference across DPF. Increasing the thickness of filter increased the pressure difference, but the reduction rates didn't increase greatly because the most of the PM was trapped upstream of filter.
이정민(Jeongmin Lee),박만호(Manho Park),오권오(Kwonoh Oh),이병하(Byungha Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Metal foam is recently used for the filter material of a diesel particulate filter in virtue of design flexibility and high soot loading capacity. For the fully passive partial filter, the durable catalytic performance is the most important. In this study, the effect of various material parameters of the catalyst coated foam have been investigated. Cr migration from metal substrate to wash coat layer have not been observed after 130,000 km of vehicle durability test. The agglomeration of Pt particles and wash coat sintering and the SiO2 build-up inside wash coat layer result in reduction of the surface area of wash coat layer and cause the reduction of catalytic performance.
촉매활성화 시험장치를 이용한 금속폼 촉매에 대한 실험적 연구
김구환(Kuhwan Kim),이정민(Jeongmin Lee),박만호(Manho Park),오권오(Kwonoh Oh),이병하(Byungha Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Exhaust gases of diesel vehicles are considered as a major reason of city air pollutions. The DOC(Diesel Oxidation Catalyst) have been used to reduce the emissions of diesel vehicles. The DOC can oxides HC, CO, and SOF(Soluble Organic Fraction) in the PM emissions. However, the performance of DOC depends on the way of vehicles test and the types of vehicles. If prediction of the DOC performance was not accurate, it could not meet the expected performance. Therefore, we simulate engine mode test in micro-reactor according to each vehicle in order to reduce the DOC performance error by predicting the performance more precisely.
이정민(Jeongmin Lee),성낙원(Nakwon Sung),조규백(Gyubaek Cho),오권오(Kwonoh Oh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The filtration of soot in the metal foam diesel particulate filter (DPF) has been studied. INCOFOAM®HighTemp is selected for DPF material for its large specific area for filtration and high thermal resistance against sudden temperature change. In the filtration process, soot particles are collected by diffusion, interception and inertial impaction. Collected soot particles inside the filter change the strut diameter, porosity and pore diameter of the filter, which affect the filtration efficiency and pressure drop through the filter. By the developed model, the filtration efficiency, pressure drop and soot mass distribution during the filtration processes can be predicted.
박만호(Manho Park),이정민(Jeongmin Lee),이의성(Euisung Lee),홍승현(Seunghyun Hong),오권오(Kwonoh Oh),김기호(Kiho Kim),김재권(Jaekwon Kim),송호영(Hoyoung Song) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this study, passive type Metal Foam partial DPF characteristics was investigated. 70% target efficiency filter designed by Metal Foam Filter design program, was installed on D6DB(6.6L) engine exhaust line and PM removal efficiency & gas conversion rate by ND-13 mode was evaluated. The Filter has around 70% PM removal efficiency on whole soot loading level. When 7g/L soot loaded on the filter, the differential pressure is 280mbar on ND-13mode 10step air flow. But repeated ND-13mode test, there is no pressure drop gain.
DPF용 금속폼의 투과도 및 Forchheimer 계수 측정
최현아(Hyunha Choi),이정민(Jeongmin Lee),성낙원(Nakwon Sung),권오채(Oh Chae Kwon),조규백(Gyubaek Cho),오권오(Kwonoh Oh),이의성(Euisung Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Recently metallic foam of Nickel-based super alloy (Inconel?HighTemp) is regarded as the prospective porous medium for DPF due the large specific area for the filtration and catalytic coating. Filtration efficiency and pressure drop between upstream and downstream of the DPF mostly depend on the exhaust gas flow properties and the micro-structural properties such as strut diameter and porosities. For modeling the filtration process, the micro-structural properties of the metallic foam are measured by using a 3D X-ray scope. And these parameters should be correlated with the porous media flow parameters such as permeability and Forchheimer coefficients evaluated from clean filter experiments. The some correlations arc examined and the best fit correlation suggested by Du Plessis is chosen for Inconel?HighTemp metallic foam.