디젤기관의 배기 배출물에 미치는 스크러버형 EGR 시스템 재순환 배기의 영향에 관한 연구

배명환,하정호,Bae, Myung-Whan,Ha, Jung-Ho 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.9

The effects of recirculated exhaust gas on the characteristics of $NO_x$ and soot emissions under a wide range of engine load have been experimentally investigated by a water-cooled, four-cylinder, indirect injection, four cycle and marine diesel engine operating at two kinds of engine speeds. The simultaneous control of $NO_x$ and soot emissions in diesel engines is targeted in this study. The EGR system is used to reduce $NO_x$ emissions, and a novel diesel soot removal device with a cylinder-type scrubber for the experiment system which has 6 water injectors(A water injector has 144 nozzles in 1.0 mm diameter) is specially designed and manufactured to reduce the soot contents in the recirculated exhaust gas to intake system of the engines. The intake oxygen concentration and the mean equivalence ratio calculated by the intake air flow and fuel consumption rate, and the exhaust oxygen concentration measured are used to analyse and discuss the influences of EGR rate on $NO_x$ and soot emissions. The experiments are performed at the fixed fuel injection timing of $15.3^{\circ}$ BTDC regardless of experimental conditions. It is found that $NO_x$ emissions are decreased and soot emissions are increased owing to the drop of intake oxygen concentration and exhaust oxygen concentration, and the rise of equivalence ratio as the EGR rate rises.

디젤기관 배기 배출물 중의 매연 입자경 및 농도의 실시간 계측

배명환(Myung-whan Bae),Takevuki Kamimoto,김정민(Jeong-min Kim) 대한기계학회 2002 대한기계학회 기타 간행물 Vol.2002 No.11

가솔린엔진 운행자동차 배기소음에 미치는 튜닝 흡기 및 배기 시스템의 효과에 관한 연구

배명환(Myung-whan Bae),구영진(Young Jin Ku),박희성(Hui-seong Park) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.1

본 연구 목적은 가솔린엔진 운행자동차의 튜닝 특징을 파악하여 안전과 환경에 문제가 없는 엔진튜닝의 효과적인 작업가능성을 확인하고, 튜닝엔진 검사의 기초자료를 확보하기 위하여 저자들의 다른 논문에서 고찰한 성능 및 배기 배출물에 미치는 효과를 기반으로 배기소음 특성을 파악하는 것이다. 소음진동관리법에 따른 운행차 소음측정법에 의해 엔진회전수 및 차량속도에 대한 배기소음 특성에 미치는 튜닝엔진 효과를 조사하기 위하여 4행정, 4기통 DOHC, 터보 인터쿨러, 수냉 가솔린엔진을 5종류의 비튜닝 및 튜닝 2-1, 2-2, 2-3(close), 2-3(open)으로 해 운행자동차에 적용하였다. 가솔린엔진 운행자동차의 튜닝부분은 흡기 다기관, 흡기 파이프, 공기필터, 배기 다기관, 배기 파이프 및 소음기가 포함되었다. 소음진동관리법에 따른 운행차 소음측정법에 의한 비튜닝 및 튜닝 가솔린엔진 운행자동차의 배기소음 측정값이 검사기준에는 모두 만족되었지만, 튜닝에 의해 배기소음이 증가되고 있음을 알았다. The purpose of this study is to identify the characteristics of exhaust noise based on the effects of performance and exhaust emissions discussed in the authors’ other papers to confirm the effective working possibility of engine tuning without problems in safety and the environment, and to obtain the basic data of the tuning engine inspection after investigating the tuning distinctions in a driving car of gasoline engine. The driving car with a four-cycle, four-cylinder DOHC, turbo-intercooler, water-cooled gasoline engine operating under five types of non-tuning, and tuning 2-1, 2-2, 2-3 (close) and 2-3 (open) was applied to investigate the effects of tuning engine on the characteristics of exhaust noises as the functions of engine and vehicle speeds by the noise measurement method of driving cars according to Noise and Vibration Control Act. The intake manifold, intake pipe, air filter, exhaust manifold, exhaust pipe and silencer were included in tuning parts for a driving car of gasoline engine. It was found that the measured values of exhaust noise for a driving car of non-tuning and tuning gasoline engines by the noise measurement method of driving cars according to Noise and Vibration Control Act met all the inspection criteria, but the exhaust noise values by tuning were increased.

다면 분할형 집광기에 의한 태양열 스털링엔진 발전시스템의 성능예측

배명환(Myung-whan Bae),장형성(Hyung-sung Chang),강상율(Sang-rul Kang) 한국태양에너지학회 2002 한국태양에너지학회 학술대회논문집 Vol.- No.-

플랜지 볼트 체결토크에 따른 볼트중심으로부터 이격거리에 대한 면압 크기 및 분포영역의 특성에 관한 연구

배명환(Myung-whan Bae),김수민(Su-min Kim) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.7

본 연구에서는 볼트체결 밀폐구조에 대해 해석적인 방법을 이용하여 체결하는 볼트의 접촉면에서 발생하는 면압분포, 접촉변형 및 기밀상태에 미치는 면압의 영향을 분석하는 것이 목적이다. 1단계로 본 논문에서는 구조해석에 의해 플랜지 볼트 및 체결토크의 크기에 따른 볼트중심에서의 이격거리에 대한 면압 크기 및 분포영역의 특성을 조사했다. 플랜지 볼트의 크기는 M6, M8, M10 및 M12를 사용했고, 체결토크는 각 플랜지 볼트의 크기에 따라 최소, 중간 및 최대의 값을 정하여 적용했다. 그 결과, 동일 플랜지 볼트에서는 체결토크가 클수록 동일한 볼트중심에서 이격거리에 대해 면압은 더 컸고, 면압 분포영역의 기울기도 더 컸지만, 면압 1 MPa 미만의 값 부근에서 수렴하였다. 또한, 1~3 MPa의 면압분포영역에서는 체결하는 플랜지 볼트의 크기가 클수록 동일한 면압에 대해 볼트중심에서 이격거리가 멀어져서 면압 분포영역이 넓어졌음을 알았다. The purpose of this study is to analyze the effect of contact pressure on the contact pressure distribution, contact deformation and airtightness generated at the contact surface of bolts fastened by the analytical method for the sealed structure of fastening bolt. In this paper, as a first step, we investigated the characteristics of magnitude and distribution area for contact pressure with respect to the separated distance from bolt center according to the flange bolt size and tightening torque by structural analysis. The sizes of flange bolt were M6, M8, M10 and M12, and the tightening torques were applied with the minimum, intermediate and maximum values according to the size of each flange bolt. The results show that for the same flange bolt, the larger the tightening torque, the larger the surface pressure with respect to the same separated distance from bolt center, and the greater the distribution region slope of contact pressure, but converged to near a value less than the contact pressure of 1 MPa. It is found, moreover, that as the size of flange bolt was increased, in the distribution area of contact pressure from 1 to 3 MPa, the distribution area of surface pressure was widened because the separated distance from bolt center at the same surface pressure became father away.

대형 2행정 디젤엔진의 SCR 및 EGR 시스템에 의한 NOx 배출물 저감 특성에 관한 연구

배명환(Myung-whan Bae),류지호(JiHo Ryu),김성완(SeongWan Kim),박희성(Hui-seong Park) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.7

본 연구의 목적은 선박용 대형 2행정 디젤엔진에 있어서 NOX 배출물에 대한 Tier III 규제값에 따르는 EGR 시스템의 적용 가능성을 확인하는 것이다. 디젤엔진에 Miller 사이클, SCR 및 EGR 시스템을 적용하여 엔진부하에 따른 최대 연소압력, 최대 압축압력, 배기온도, 연료소비율, O₂ 및 NOX 배출물을 실험에 의해 측정하여 비교하였다. 실험 결과는 Miller 사이클을 적용한 경우, 연비는 SCR 및 EGR 시스템보다 높았고, ISO 수정식에 의한 NOX 배출물의 최종 산정값은 Tier II 규제값을 만족하였다. 또한, SCR 및 EGR 시스템을 적용하여 측정한 NOX 배출물의 ISO 수정식에 따른 산정값은 Tier III 규제값을 만족하였고, EGR 시스템에 있어서 NOX 배출물의 산정값은 SCR 시스템보다 0.4 g/kWh 더 많았지만, EGR 시스템 적용에 의해 규제값을 만족시킬 수 있음을 알았다. The purpose of this study is to identify the applicability of EGR system complying with the Tier III regulation values for NOx emissions in a marine large two-stroke diesel engine. The Miller cycle, SCR and EGR systems were applied to the diesel engine, and the maximum combustion pressure, maximum compression pressure, exhaust temperature, fuel consumption rate, and the O₂ and NOx emissions as a function of engine load in each case were experimentally measured and subsequently compared. It was concluded that the fuel economy was higher than those of SCR and EGR systems, and the final estimated NOx emissions bases on the modified ISO formula satisfied the Tier II regulation values when the Miller cycle was applied. In addition, it was found that the estimated values of NOx emissions measured by applying the SCR and EGR systems corresponding to the modified ISO formula met in the Tier III regulation values, and this value of NOx emissions by EGR system was 0.4 g/kWh more than that of SCR system, but the regulation value could be met by the application of EGR system.

흡음덕트 부착 열회수형 환기장치의 음향성능 평가에 관한 연구

배명환(Myung-Whan Bae),송준영(Jun-Young Song),박희성(Hui-Seong Park) 한국마린엔지니어링학회 2016 한국마린엔지니어링학회지 Vol.40 No.6

단기통 4행정 농용 디젤기관의 개발 연료펌프 성능특성에 관한 연구

배명환(Myung-whan Bae),이상해(Sang-hae Lee),정화(Hwa Jung) 한국마린엔지니어링학회 2016 한국마린엔지니어링학회지 Vol.40 No.9

운행자동차의 흡기 다기관, 흡기 파이프 및 공기필터의 튜닝에 의한 성능 및 배기 배출물 효과

배명환(Myung-whan Bae),구영진(Young Jin Ku),박희성(Hui-seong Park) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5

The purpose of this study is to identify the possibility of effective tuning works and understand the characteristics of tuning engine corresponding to the safe operation and environment of a driving gasoline car. The effects of tuning on the characteristics of performance and exhaust emissions under a wide range of engine speeds are experimentally investigated by the actual driving car with a four-cycle, four-cylinder DOHC, turbo-intercooler, water-cooled gasoline engine operating at four types of non- tuning, tuning 1, 2 and 3. The tuning parts in the gasoline engine are intake manifold, intake pipe and air filter. It is found that the actual air-fuel ratio of non-tuning engine was slightly higher than those of tuning engines. The output was significantly increased by the tuning whereby the maximum output of tuning engine was more increased to approximately 117.64% than that of non-tuning engine. In addition, CO, THC and NOx emissions of non-tuning and tuning engines measured by the constant-speed test mode were all satisfied with the inspection standards, and CO emission was increased, while THC and NOx emissions were reduced by tuning.

운행 가솔린자동차 엔진성능에 미치는 튜닝 흡기 및 배기 시스템의 효과에 관한 연구

배명환(Myung-whan Bae),구영진(Young Jin Ku),박희성(Hui-seong Park) 대한기계학회 2017 大韓機械學會論文集B Vol.41 No.11

본 연구의 목적은 운행자동차에 있어서 안전운행과 환경에 문제가 없는 효과적인 엔진튜닝의 작업가능성을 확인하고, 튜닝엔진의 특징을 파악하여 엔진튜닝 검사의 기초자료를 분석하는 것이다. 비튜닝 및 튜닝 엔진 2-1, 2-2, 2-3의 4종류에 대한 넓은 범위의 엔진회전수 하에서 4행정, 4기통 DOHC, 터보인터쿨러, 수냉 가솔린엔진의 실제 운행자동차를 사용하여 공연비 및 성능 특성에 미치는 튜닝엔진의 효과를 실험적으로 조사했다. 운행 가솔린자동차에 대한 엔진의 튜닝 부분은 흡기 다기관, 흡기 파이프, 공기필터, 배기 다기관, 배기 파이프 및 소음기를 포함한다. 1인이 탑승한 5단 자동변속기를 갖는 운행 가솔린자동차 비튜닝 및 튜닝 엔진의 공연비 및 토크는 차대 동력계(Dynojet 224xLC)에 의하여 실험에 의해 측정하였다. 운행 가솔린자동차 튜닝엔진의 최대 토크는 비튜닝엔진보다 평균 103.68% 만큼 증가되었고, 튜닝엔진의 최대 출력은 비튜닝엔진보다도 평균 119.68% 만큼 증가되었음을 알았다. The purpose of this study was to analyse the basic data of the engine tuning inspection by confirming the working possibility of effective engine tuning and identifying the characteristics of tuned engine that are no problem with the safety operation and environment in a driving gasoline car. The effects of tuned engine on the characteristics of air/fuel ratio and performance at a wide range of engine speeds were experimentally investigated by the actual driving car with a four-cycle, four-cylinder DOHC, turbo- intercooler, water-cooled gasoline engine operating under four types of non-tuning, and tuning 2-1, 2-2 and 2-3. The tuned parts of engine in a driving gasoline car include the intake manifold, intake pipe, air filter, exhaust manifold, exhaust pipe and silencer. In this experiment, the air-fuel ratio and torque of both non-tuned and tuned engines that one person took on board in the car with a five-speed automatic transmission were measured by the chassis dynamometer(Dynojet 224xLC). It was found that the maximum torque of tuned engine in a driving gasoline car was increased by 103.68% on average, while the maximum output was increased by 119.68% on average in comparison to the non-tuned engine.