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[가솔린엔진부문] 정상유동장치 안에서의 고압 가솔린 분사기의 연료분무 특성
최재준(Jaejoon Choi),이석환(Seokhwan Lee),배충식(Choongsik Bae) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The direct injection into the cylinders has been regarded as a way of the reduction in fuel consumption and some pollutant emissions. Its spray is of paramount importance in that the primary atomization process must meet the requirement of quick and complete evaporation and combustion. The spray geometry must be stable and compact showing controlled mixture formation by taking a benefit from in-cylinder charge flows.<br/> The interaction between flow and injector spray was investigated in a steady flow system embodied in a wind tunnel to simulate the variety of flow inside the cylinder of the direct-injection spark ignition engine. The spray developments in flowing fields with the mean velocity up to l7m/s were at first identified by spray visualization. The direct Mie scattered images and Shadowgraph images presented the macroscopic view of the liquid sprays and the spatial distribution of vapor fields. The microscopic characteristics of the spray were investigated by the velocity and particle size measurements using a phase Doppler anemometer (PDA).<br/>
축산바이오가스발전시스템 가동 시 발생되는 연소 배기가스 중 SO<sub>2</sub>에 관한 연구
최재준(Choi, Jaejoon),정대헌(Jung, Daehun),박병식(Park, Byungsik),박진성(Park, Jinsung),허창수(Huh, Changsu) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
대체 에너지 자원 중 폐기물의 소화 가스를 이용한 바이오가스 발전은 이산화탄소에 비해 온실효과 영향력에 21배에 해당하는 메탄가스를 연료로 사용하여 환경부하를 저감시키고 에너지를 생산한다. 바이오가스에 포함된 H₂S는 연소 후 SO₂형태로 발생되는데 SO₂는 수분과 반응을 하게 되면 H₂SO₄등의 강한 산성을 띄는 물질로 생성되어 배관 및 발전기에 손상을 주고 저온부식현상을 유발하게 하며, 동물이나 인체에 노출되면 기관지 수축현상이 일어나 호흡기에 영향을 주는 질식성을 띄는 가스이다. 축산바이오가스에 포함된 H₂S의 함유량과 가스엔진의 연소 시 배출되는 SO₂ 배기가스 성분의 관련성을 검증하기 위해 60-65%의 CH₄와 30-35%의 CO₂ 성분의 바이오가스를 50kW급 발전기에서 사용하였고 연소 후 배출되는 가스 성분을 분석하였다.
최재준(Jaejoon Choi),김혁주(Hyukjoo Kim),정대헌(Daeheon Jung),박화춘(Hwa-Choon Park) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The importance of the more efficient cogeneration system is emphasized. Also the more clean energy is needed at recent energy system. The cogeneration system using Lean burn engine is more preferred to the system using Rich burn engine because of the electrical efficiency. Although the cogeneration system using Lean burn engine is economically preferred, because of the NOx emission level, the system using Rich burn engine with 3-way catalyst can only be used in Korea. The NOx regulation level is 50ppm at oxygen level 13%. The cogeneration hybrid system using Lean burn engine is up to be optimized because of the large amount of the extra-fuel at the after-burner system. The after-burner system at different concept was applied. The reduction time for the activation temperature of the DeNOx catalyst was achieved by making a hole between the combustor and boiler. Because of the lowered fuel consumption, the lowered temperature level was optimized by blocking the hole of the boiler The optimized cogeneration hybrid system consumes 76Nm³/h LNG to produce 150㎾ electricity compared to before optimization 103Nm³/h LNG. The system was accurately evaluated and the result is following ; 90% total efficiency, below 10 ppm NOx, 50ppm CO, 25ppm HC. The cogeneration hybrid system can meet the current NOx level and exhaust gas regulation. It can achieve the clean combustion gas and efficient cogeneration system.
최재준(Jaejoon Choi),박종일(Jong-Il Park) 한국정보과학회 2019 정보과학회 컴퓨팅의 실제 논문지 Vol.25 No.1
모바일 기기의 다양한 센서를 이용하여 공간과 움직임을 인지하는 많은 연구들이 진행되었다. 사용되는 센서 들의 물리적인 제약사항은 실제 공간 정보와 인식한 정보 대비 차이가 발생하는 원인이 되며 이를 보정하기 위하여 여러 종류의 센서 정보를 통합하여 사용한다. 서로 다른 종류의 센서를 통합하여 사용할 경우 센서 간의 시간적 차이로 통합된 공간 인지 정보에 오차가 발생할 수 있다. 본 논문에서는 영상과 모션 센서의 통합 사용에서 발생하는 두 정보의 시간 차이를 보정하는 방법을 제안한다. 제안된 방법은 별도의 외부 교정 장치나 교정을 위한 이상적인 동작 제약을 필요로 하지 않는다. 또한 시간차 추정이 가능한 제한된 이상적 동작 상황과의 비교를 통하여 영상의 재생 빈도 수준에 가까운 보정이 가능함을 검증하였다. Many studies have been conducted to recognize space and motion using various sensors of mobile devices. Physical constraints of sensors used cause the difference between actual spatial information and recognized information, and various types of sensor information are integrated to compensate for the difference. If different types of sensors are integrated, there may be an error in integrated spatial perception information, due to the time difference between sensors. In this paper, we propose a method to compensate for time distance of sensors, that occurs in integrated use of image and motion sensors. The proposed method does not require external calibration equipment, or ideal operating constraints, for calibration. We also verified that it is possible to perform compensation close to the refresh rate level of the image through comparison, with limited ideal operation condition that can estimate time distance.
가정용 스털링엔진 및 가스엔진 열병합발전시스템의 성능특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),김혁주(Hyouckju Kim),강석훈(Seokhoon Kang),임용훈(Yonghoon Im),송대섭(Daesup Song) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies. Recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption relative to the household (condensing) boiler producing heat only. A tiny gas-fueled internal combustion engine cogeneration system and two cogeneration systems based on Stirling engine as primary mover which can produce 1㎾ of electrical output were investigated from various aspects. The electrical efficiency and thermal efficiency of the systems were measured. The emission and noise characteristics were also analyzed and compared with each other. The cogeneration system based on internal combustion reciprocating engine was superior to the others in the efficiency of electrical power but was inferior in the noise and vibration level.
고압 가솔린/디젤, 액상 LPG 분사의 저온 연료분무 특성
최재준(Jaejoon Choi),이석환(Seokhwan Lee),최동석(Dongseok Choi),공장식(Jangsik Kong),강진석(Jinsuk Kang),배충식(Choongsik Bae) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Engine emission during cold start below zero temperature condition is one of the issues as the emission emitted during that period covers 80% of the total emission for passenger cars. Spray characteristics(vaporization, atomization and penetration) in the low temperature condition is, therefore, important as they affect engine combustion followed by engine-out emission.<br/> A wide range of injectors were tested and characterized. Spray characteristics were evaluated in two typical temperatures( 15°C and -10°C). Spray characteristics with the DISI and HSDI injectors seemed to be independent on temperatures selected in the reported work while LPG injector exhibited the growth of the liquid droplet size and the increase of liquid penetration to lead a difference of engine combustion condition and engine-out emission.
횡방향 유속 변화에 따른 고압 가솔린 스월 인젝터의 분무특성
최재준(Jaejoon Choi),이용석(Youngseok Lee),최동석(Dong-Seok Choi),배충식(Choongsik Bae) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The direct injection into the cylinders has been regarded as a way of the reduction in fuel consumption and pollutant emissions. The spray produced from the injector of DISI(Direct Injection Spark Ignition) engine is of paramount importance in DISI engines The interactio<br/> between air flow and fuel spray was investigated in a steady flow system embodied in a wind tunnel to simulate the variety of flow inside the cylinder of the GDI engine. The direct Mie scattered images presented the macroscopic view of the liquid spray fields interacted wit<br/> crossflow. Particle sizes of fuel droplets were investigated by Phase Doppler Anemometer(PDA) system. Faster crossflow field made SMD larger and D 10 smaller. The processes of atomizatio and evaporation with a GDI injector were observed and consequently utilized to construct the data-base for the spray and fuel-air mixing mechanism as a function of the flow characteristics.<br/>
가정용 스털링엔진 열병합발전시스템의 성능 특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),김혁주(Hyouckju Kim),강석훈(Seokhoon Kang),임용훈(Yonghoon Im),송대섭(Daesup Song) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies. Recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption policy relative to the household (condensing) boiler producing heat only. Two cogeneration systems based on Stirling engine as primary mover which can produce 1㎾ of electrical output were investigated from various aspects. The electrical efficiency and thermal efficiency of the systems were measured. The experiment was executed at an independent Stirling engine mode, an independent secondary burner mode, and a combined mode. The emission and noise characteristics were also analyzed and compared with each other. The one cogeneration system was superior to the other in the efficiency of electrical power.
부하변화에 따른 가정용 스털링엔진 열병합발전시스템의 성능특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),김혁주(Hyouckju Kim),송대섭(Daesup Song) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies. Recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption policy relative to the household (condensing) boiler producing heat only. A cogeneration system based on Stirling engine as a primary mover which can produce maximum 1.1kW of electrical output was investigated from various aspects. The part load characteristics are investigated mainly. The electrical efficiency and thermal efficiency of the systems were measured. The experiment was executed at an independent Stirling engine mode without operating secondary burner. The electrical efficiency of the system was decreased as the electrical power decreased and the thermal efficiency of the system was increased as the electrical power decreased.