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김재덕(Jaeduk Kim),구리 아이눌(Ghurri Ainull),송규근(Kyukeun Song),정재연(Jaeyeon Jung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This study is conducted to investigate the fuel spray characteristics on common-rail injection system according to fuel type, injection pressure, injection duration, and fuel viscosity respectively. The effect of the biodiesel fuel mixing ratio on the spray and emission gases characteristics are also informed at various experimental conditions. The experiment results show that the biodiesel characteristics in this study have different spray patterns compared to the diesel fuel due to injection pressure and injection duration. The emission characteristics of biodiesel fuel are affected by the mixing ratio of biodiesel. It has lower emissions compared to diesel fuel though it has similar power to diesel fuel.
김재덕(Jaeduk Kim),송규근(Kyukeun Song),정재연(JaeYoun Jung),진뢰(Lei Chen),성욱곤(Yukun Cheng) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
With the development of global automobile industry, the pollution caused by automobile exhaust gas has become more and more serious, especially NOx pollution. During these years, the government recognizes the problem and legislates to limit the exhaust emission. As the main power source of vehicle, the question how to purify NOx emission for diesel engine has become one of the hotspots. Now, technology of EGR is known as the effective method to purify NOx emission, which is available for diesel engine. diesel engine are introduced in this article. The mechanism of nitrogen oxides formation and how the EGR can reduce the NOx emission are studied, and we have done the test experiment of the diesel engine, The main contents includes: Adapting to the requirement of the emission legislation, an EGR system was applied to a diesel engine to reduce NOx emission. The effects of different EGR rate on the emissions and performances of the engine were investigated by the engine test, in which the EGR rates of different engine mode will be optimized based. The results showed that EGR can reduce NOx emission of this diesel engine significantly under various operation conditions, but it will have negative influence on smoke, the effective torque and the effective specific fuel consumption with the increasing of EGR rates. So there will be an optimum working state of EGR rates under various operation conditions. Through the optimum emission test for EGR, it proves that the optimized EGR strategy can reduce the NOx emission efficiently and limit the negative influence on other emission and the performance of engine.
김재덕 ( Jaeduk Kim ) 이화여자대학교 법학연구소 2015 法學論集 Vol.20 No.1
Arrest is divided into three types of arrest by arrest warrant, arrest of flagrant offender and emergency arrest in accordance with the Criminal Procedure Code, and emergency arrest of the aforementioned is to arrest a suspect, not a flagrant offender without a warrant under an emergent situation that restriction of human body by preliminary warrant is unavailable, which has many problems about illegality or abuse as compared to the rest two arrests. In other words, control over the foregoing is considered necessary when considering occurrence of the case of using emergency arrest as a method to circumvent controversy of illegality of voluntary company or as means for expediency of investigation occurs, and high release rate after emergency arrest. In addition, emergency arrest is also insufficient for defense or protection of suspect’s human rights due to its wide scope of crimes. Although the Criminal Procedure Code was supplemented to a certain extent admitting the duty to notify to the court, limitation in re-emergency arrest, suspect’s right to read·copy, but still remains insufficient to be a fundamental countermeasure. Fundamentally, it is required to regulate or apply the requirements for emergency arrest strictly and introduce post warrant system to ensure legality of emergency arrest.
건설기계 폐열회수를 위한 Organic Rankine Cycle 해석 연구
김재덕(kim Jaeduk),강석호(Kang Seokho),유한성(Yoo Hanseong),정주영(Jeong Jooyeong) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Recently, there have been consistent research efforts to improve fuel economy as response to the depletion of fossil fuels and global warming. With regard to construction equipment (i.e., one of the most energy-wasting types of machinery), fuel economy improvement through advancement in engine technologies has reached its limit. Hence, we conducted a study in which a waste heat recovery (WHR) system was incorporated into a construction machine to improve the energy efficiency. Excavators are one such machine where significant portions of the fuel-generated energy are not utilized effectively for work but instead wastefully discharged to the atmosphere.
디젤엔진을 이용한 바이오디젤 연료의 기관성능에 관한 연구
김재덕(Jaeduk Kim),Ghurri Ainul,안병규(Byounkyu Ahn),송규근(Kyukeuni Song) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.9
The combustion efficiency in diesel engine and its fuel economical are excellent. On the emission side, it has been shown that the exhaust gases from diesel engine became the cause of air pollution problem rather than the gasoline engine. Itis strongly needed to reduce the emissions on PM and NOx as the main pollutant on diesel engine. It demands the alternative fuels to achieve the emission gas reduction. The bio-diesel fuel has advantages in the view point of air pollution improvement. Bio-diesel can be made from cooking and vegetable oil. In the engine performance experimental results, it is observed that the highest maximum pressure inside combustion chamber was achieved by BD50, followed by BD25 and diesel fuel. At 2000 rpm the maximum pressure of all tested fuels were relatively same. The heat released showed a similar trend to that of maximum pressure. The IHP of BD50 was clearly higher than BD25 and diesel fuel at all engine speed. However the BHP of BD50 was slightly higher than BD25 and diesel fuel. The indicated mean effective pressure of all tested fuels showed the obvious difference with BD50 had highest IMEP, followed by BD25 and diesel fuel. From the emission measurement, it is shown that the emission characteristics of exhaust gas is strongly affected by the blending ratio of diesel and bio-diesel.
김재덕(Jaeduk Kim),적무림(Maolin Zhai),김형곤(Hyunggon Kim),정재연(JaeYoun Jung),송규근(Kyukeun Song) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.5-2
An experimental study was conducted to examine the effect of injection pressure and fuel type on the spray tip penetration length of spray injected into atmospheric chamber. The objective of the present study is to formulate empirical correlations of the spray tip penetration for non-evaporative condition. The experiment was performed by a common rail type high-pressure injector for the diesel engine at the injection pressure 40 - 100 MPa and four different fuels (D100, BD25, BD45, and BD65). The results showed that the biodiesel content increased the spray tip penetration. The correlation of spray tip penetration is expressed for each region before and after spray break-up time in terms of injection pressure, fuel viscosity and time after start of injection.