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LPG 액상분사식 인젝터 분사팁의 아이싱 발생 특성 연구
박철웅(Cheolwoong Park),김창업(Changup Kim),최교남(Kyonam Choi),강건용(Kernyong Kang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The use of clean gaseous fuel for the purpose of high efficiency and low emission in automotive engines has tendency of increase in order to meet the reinforcing emission regulations and to efficiently utilize limited natural resources. Since the liquid phase LPG injection (LPLI) system has a very strong potential to accomplish the higher power, higher efficiency, and lower emission characteristics than the mixer type fuel system, automotive companies developed and commercialized it. However, when a liquid LPG fuel is injected into the inlet duct of an engine, a large quantity of heat is extracted due to evaporation of fuel. This leads to freezing of the moisture in the air around the outlet of a nozzle, which is called icing phenomenon. It may cause damage to the outlet nozzle of an injector or inlet valve seat. This research examines the characteristics of icing phenomenon and also aimed to improve it through the use of anti-icing bushing at the fuel injection tip. The result showed that the icing phenomenon and process were mainly affected by humidity and temperature of inlet air in the inlet duct. Also, it was observed that the icing phenomenon improved by using aluminum bushing whose end matches the end of fuel injection tip in length.
LPG 액상분사식 인젝터에서 후적에 의한 아이싱 특성 연구
박철웅,김창업,최교남,강건용,Park, Cheol-Woong,Kim, Chang-Up,Choi, Kyo-Nam,Kang, Kern-Yong 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
Since the liquid phase LPG injection(LPLI) system has an advantage of higher power and lower emission characteristics than the mixer type fuel supply system, many studies and applications have been conducted. However, the heat extraction, due to the evaporation of liquid fuel, causes not only a dropping of LPG fuel but also icing phenomenon that is a frost of moisture in the air around the nozzle tip. Because both lead to a difficulty in the control of accurate air fuel ratio, it can result in poor engine performance and a large amount of HC emissions. The experimental investigation was carried out on the bench test rig in this study. It was found that n-butane, that has a relatively high boiling point($-0.5^{\circ}C$), was a main species of droplet composition and also found that the droplet problem was improved by the use of a large inner to outer bore ratio nozzle whose surface roughness is smooth. The icing phenomena were decreased when the an engine head temperature was increased, although a large amount of icing deposit was still observed in the case of $87^{\circ}C$. Also, it was observed that the icing phenomenon is improved by using anti-icing bushing.
LPG 액상분사식 인젝터의 후적 및 아이싱 특성에 관한 연구
박철웅(Cheolwoong Park),김창업(Changup Kim),최교남(Kyonam Choi),강건용(Kernyong Kang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Since the liquid phase LPG injection (LPLI) system has an advantage of higher power and lower emission characteristics than the mixer type fuel supply system, many studies and applications have been conducted. However, the heat extraction, due to the evaporation of liquid fuel, causes not only a post-accumulation of fuel but also an icing phenomenon that is a frost of moisture in the air around the nozzle tip. Because both lead to a difficulty in the control of accurate air fuel ratio, it can result in poor engine performance and a large amount of harmful emissions. The experimental investigation was carried out on the bench test rig during this study. It was found that n-butane, that has a relatively high boiling point (- 0.5℃), was a main species of post-accumulation and also found that the post-accumulation problem was improved by the use of a large inner to outer bore ratio nozzle whose surface roughness is smooth. The icing phenomena were decreased when the temperature of an engine head was increased, although a large amount of icing deposit was observed in the case of 87℃.
김창업 ( C. U. Kim ),오승묵 ( S. M. Oh ),강건용 ( K. Y. Kang ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.2
N/A The liquid phase LPG injection (LPLI) system (the third generation technology) has been considered one of the next generation fuel supply system for LPG vehicles, since it has a very strong potential to accomplish the higher power, higher efficiency, and lower emission characteristics than the mixer type(the second generation technology) fuel supply system. However, when a liquid LPG fuel is injected into the inlet duct of an engine, a large quantity of heat is extracted due to evaporation of fuel. This leads to freezing of the moisture in the air around the outlet of a nozzle, which is called icing phenomenon. It may cause damage to the outlet nozzle of an injector or inlet valve seat. In this work, the experimental investigation of the icing phenomenon was carried out. The results showed that the icing phenomenon and process were mainly affected by humidity of inlet air instead of air temperature in the inlet duct. Also, it was observed that the total ice formed around the nozzle weighs at about 150㎎~260㎎ after injection for ten minutes. And some fuel species were found in the ice attached at the front side of a nozzle, while frozen ice attached at the back of a nozzle was mostly consisted of moisture of inlet air. Therefore, some frozen ice deposit, detached from front nozzle of an injector, may cause a problem of unfavorable air fuel ratio control in the small LPLI engine.