스크러버型 EGR시스템 디젤機關의 排氣 排出物에 미치는 再循環 排氣의 影響에 관한 硏究

裵明煥 慶尙大學校 工科大學 機械設計學科 1997 WORKSHOP 자료집 Vol.1997 No.1

다면 분할형 집광기에 의한 태양열 스털링엔진 발전시스템의 성능예측

배명환,강상율 경상대학교 생산기술연구소 2002 工學硏究院論文集 Vol.2 No.-

The projection area of concentrator should be increased to raise the output level of a solar power system. In such a case, a stretched membrane concentrator is sometimes used instead of one made by monolithic construction. In this study, the simulation analyses of power system in a solar stirling engine with multifaceted stretched membrane concentrator which consists of thirty-two circular mirror elements constructed along the paraboloid are carried out to predict the system performance. In addition, influences of engine speed and mean pressure on mechanical efficiency, and engine speed on generator efficiency are discussed in simulation. It is found that the collector efficiency of multifaceted stretched membrane concentrator is lower than one of monolithic type, especially affected strongly by the worse direct solar radiation, and there is a necessity for matching collector/receiver to engine/generator systems to actualize a well efficient system.

보일러 FGR 환경설비시스템에 있어서 배기 배출물에 미치는 재순환 배기의 영향

배명환,김정민,최승철 경상대학교 생산기술연구소 2003 工學硏究院論文集 Vol.19 No.-

The effect of recirculated exhaust gas on exhaust emissions under four kinds of nozzle tip with the different fuel consumption rate are experimentally investigated by using an once- through boiler with FGR system. The purpose of this study is to develop the FGR control system for reducing NO, in a boiler. Intake and exhaust oxygen concentrations, and equivalence ratio are applied to discuss the effect of FGR rate on exhaust emissions at various fuel consumption rates. It is found that NO, emissions are decreased, while soot emissions are increased owing to the drop of intake and exhaust oxygen concentrations, and the rise of equivalence ratio as FGR rates are elevated.

EGR시스템에 의한 디젤機關의 NO_x 및 煤煙 排出物 同時低減

裵明煥 慶尙大學校 工科大學 機械設計學科 1997 WORKSHOP 자료집 Vol.1997 No.1

The effects of exhaust gas recirculation(EGR) on the characteristics of Nox emissions and specific fuel consumption rate have been investigated using an eight-cylinder, four cycle, direct injection diesel engine operating at several loads and speeds. The theoreti-cal NO formation concentration is calculated with the equivalence ratio as a parameter of flame temperature to study the effect of EGR on NO_x emissions in the diesel combustion. The experiments in this study are conducted on the fixed fuel injection timing of 38 ' BTDC regardless of experimental conditions. It is found that the specific fuel consumption rate is slightly increased with EGR rate, and NO_x emissions are markedly reduced owing to the drop of the incoming oxygen concentration and the increase of equivalence ratio as the EGR rate increases.

가스터빈用 高溫 燃燒器의 開發

裵明煥 慶尙大學校 工科大學 機械設計學科 1997 WORKSHOP 자료집 Vol.1997 No.1

燃燒機關의 煤煙生成過程 모델링用 高溫·高壓 燃燒裝置의 開發

裵明煥 慶尙大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.13 No.-

A constant-volume combustion chamber with disk-type is developed to study the soot formation process under high temperatures and pressures. The premixed fuel rich propane-oxygen-inert gas mixture is simultaneously ignited by eight spark plugs located on the circumference of combus- tion chamber with 45 degree intervals. The eight converging flames compress the end gases to high pressures. The advantages of this experimental approach with symmetrically converging flames are as follows; first, the history of soot formation process with time during high tempe- ratures and pressures can be measured because the premixture in the observation field of combustion chamber is burned with a nearly constant pressure at the final stage of combustion process and the burnt gases of the observation region rarely flow in the chamber; and secondly, the combustion conditions during soot formation process can be arbitrarily changed because the combustion pressure and burnt gas temperature are easily varied by the initially charged pressure, and by the volume fraction of inert gas and oxygen concentration in the premixture, respectively.

선박용 대형 2행정 디젤기관에 있어서 모터구동 실린더 주유기의 유량 및 송출 특성

배명환,정화,안명훈 경상대학교 생산기술연구소 2003 工學硏究院論文集 Vol.19 No.-

It is of great economic importance to minimize the cylinder wear and the consumption rate of cylinder oil. The home-manufactured motor-drive cylinder lubricator is first developed by the industry-university cooperation. The effects of revolution speed, oil temperature and plunger stroke length on oil flow rate. injection delay duration, and maximum delivery and injection pressures are experimentally investigated by the cylinder lubricator developed in this study. The maximum delivery pressure of oil line in 0.03 m and the maximum injection pressure of oil line in 6.78 m away from the end of lubricating slot are risen as plunger stroke length and revolution speed are increased, but the maximum delivery and injection pressures are lowered as the oil temperature is increased without plunger stroke length.

설치장소에 따른 태양열 스털링엔진 발전시스템의 성능예측에 관한 연구

배명환,장형성,강상율 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-

The simulation analyses of a dish solar power system with stilling engine in this study are applied to system performance prediction in four different test sites; Seoul, Pusan and Cheju in Korea, and Naha in Japan. The effects of difference of concentrator type such as monolithic and stretched-membrane construction on system efficiency are also evaluated. The total amount of generated power for a year depends on the site. However the total maximum system efficiency in every site is approximately 16% and there isn't a striking difference. It is also found that the maximum collector efficiency of stretched-membrane concentrator Is about 3 ∼ 15% lower than that of the monolithic type.

플라즈마 EGR 조합시스템 전자제어 컴먼레일 디젤기관의 성능 및 NO_(x)ㆍTHC 배출물 특성

배명환,구영진,이동윤 慶尙大學校 經營行政大學院 2004 工學硏究院論文集 Vol.20 No.-

The aim in this study is to develop the combined turbo intercooler EGR system with a non-thermal plasma reactor for reducing exhaust emissions and improving fuel economy in ECU common-rail diesel engines. At the first step, the characteristics of performance and NO_(x) · THC emissions under four kinds of engine loads are experimentally investigated by using a four-cycle, four-cylinder, direct injection type, water-cooled ECU common-rail diesel engine with a combined turbo intercooler plasma exhaust gas recirculation(EGR) system operating at three kinds of engine speeds. The EGR and turbo intercooler system are used to reduce NO_(x) emissions, and the non-thermal plasma reactor and turbo intercooler system are used to reduce THC emissions. In this study, the plasma system is a flat-to-flat type reactor operated by a plasma power supply. The fuel is sprayed by pilot and main injections at the variable injection timing between BTDC 15˚ and ATDC 1˚ according to experimental conditions. It is found that the specific fuel consumption rate with increasing EGR rate is increased, but the fuel economy is better than that of mechanical injection type diesel engine as compared with the same output. Results show that NO_(x) emissions are decreased, but THC emissions are increased, as the EGR rate is elevated. NO_(x) and THC emissions are also slightly decreased as the applied electrical voltage of the non-thermal plasma reactor is elevated.

플랜지 볼트 체결거리에 따른 두 볼트 중심으로부터 이격거리에 대한 면압 크기 및 분포영역의 특성에 관한 연구

배명환,김수민 대한기계학회 2019 大韓機械學會論文集A Vol.43 No.2

In this study, as a second step, the characteristics of magnitude and distribution area for contact pressure with respect to the separated distance from bolt center were investigated by the tightening distance between two bolts for each flange bolt size. The sizes of flange bolt were M6, M8, M10 and M12. The tightening torque for the size of each flange bolt was applied by the minimum value. The results show that the slope of contact pressure magnitude according to the separated distance from the middle of the two bolts was almost the same even if the tightening distance between the flange bolts was increased, and as the flange bolt size was increased, the tightening distance between bolts at the minimum setting contact pressure of 1 MPa was increased. It is found, in addition, that the larger the flange bolt size for the same contact pressure in the contact pressure distribution area of 1 to 3 MPa, the greater the distribution area of contact pressure because the separated distance from bolt center in the two cases than the one flange bolt tightening was increased. This tendency was more greatly shown as the flange bolt size was larger and the contact pressure was closer to 1 MPa. 본 연구에서는 2단계로 각 플랜지 볼트 크기에 있어서 2개 볼트 간의 체결거리에 따른 볼트중심에서의 이격거리에 대한 면압 크기 및 분포영역 특성을 조사했다. 플랜지 볼트의 크기는 M6, M8, M10 및 M12였고, 체결토크는 각 플랜지 볼트의 크기에 따라 최소값을 적용했다. 그 결과, 플랜지 볼트 간 체결거리가 멀어져도 두 볼트 중심으로부터 이격거리에 따른 면압크기의 기울기는 거의 동일하게 나타났고, 플랜지 볼트의 크기가 증가할수록 최소 설정 면압 1MPa에서의 볼트 체결거리는 증가하였다. 또한, 각 플랜지 볼트에 대한 1~3 MPa의 면압 분포영역에서 동일한 면압에 대해 1개 플랜지 볼트 체결보다는 2개의 경우에 볼트중심에서 이격거리가 증가하여 면압 분포영역이 넓어졌다. 이러한 경향은 플랜지 볼트의 크기가 클수록, 또한 면압크기가 1MPa에 가까울수록 더 크게 나타났다.