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Ainul Ghurri,김재덕,송규근,정재연,김형곤 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.4
An experimental study was performed on spray characteristics of spray diesel (D100) and biodiesel blend (BD65) injected into an atmospheric chamber. A qualitative analysis of spray images was conducted through exploiting the image processing with common image processing software. The results showed that the posterization of the images offered more detailed qualitative information on the spray compared to the more commonly-used threshold method. The posterized images showed the existence of layers in the spray with its transition at different grey levels. At lower injection, the spray tip penetration of BD65 was slightly lower than D100, whereas at high injection pressure, spray tip penetration of BD65 was higher than D100. Although BD65 had lower maximum velocity, the higher density of biodiesel may have resulted in greater momentum that enabled BD65 to have longer spray tip penetration at higher injection pressure. At higher injection pressure, the spray angle of BD65 tended to be less than that of D100.
Ainul Ghurri,Jae-Duk Kim,Hyung Gon Kim,정재연,송규근 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9
An experimental study was conducted to examine the effect of injection pressure and fuel type on the spray tip penetration length and the angle of spray injected into atmospheric chamber. The objective of the present study is to formulate empirical correlations of the spray tip penetration and the spray angle for non-evaporative condition. The experiment was performed by a common rail type highpressure 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 and decreased the spray angle. 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. The correlation is also obtained for spray angle equation terms of injection pressure and fuel viscosity.
김재덕(Jaeduk Kim),Ghurri Ainul,이양(yang Li),송규근(Kyukeuni Song),정재연(JaeYoun Jung) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.5
??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. It is 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. The NOx emissions increased by increasing of bio-diesel content. The NOx emission of BD50 was significantly higher than diesel fuel. However this difference was smaller at higher engine speed. On the other hand, the use of bio-diesel decreased the CO emission significantly at all tested engine speed. The measurement of exhaust gas temperature showed that the exhaust gas temperature of BD25 and BD50 were significantly lower than that of diesel fuel. As brief conclusion for engine performance and emission test, the bio-diesel can be used for alternative fuel for conventional diesel. It produced similar power compared to diesel fuel; and lower CO emissions compared to diesel fuel though the NOx emissions is higher than the diesel fuel.
커먼레일 시스템에서 디젤과 바이오디젤의 분무특성에 관한 연구
김재덕(Jaeduk Kim),구리아이눌(Ainull Ghurri),이양(Yang Li),송규근(Kyukeun Song),정재연(Jaeyeon Jung) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
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.
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),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.
기체주입미립화를 이용한 등유와 식물유 분무의 미립화특성 연구
김석곤(Seokgon Kim),김재덕(Jaeduk Kim),아이눌 구리(Ainul ghurri),송규근(Kyukeun Song),정재연(Jaeyoun Jung),김형곤(Hyunggon Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Investigation of atomization characteristics between kerosene and vegetable oil spray was carried out. Kerosene and vegetable oil spray are produced by effervescent atomizer with separated air chamber in this study. To examine microscopic atomization characteristics including drop size distribution, cumulative volume fraction, span factor and SMD, LDPA was employed. During the experiments, the volume flow rate of working fluids was kept constant at 0.1g/s, and the ALR was changed from 0.1 to 0.8. Experimental results showed that SMD is obtained under 40㎛ in the most of experimental conditions, regardless of working fluids type. Also, we can observe that SMD is increased but droplet is more uniform when we perform injection especially using vegetable oil as working fluid rather than kerosene.