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Bio Diesel의 연료온도에 따른 분무 및 연소특성에 관한 연구
김대용(Dae yong Kim),조인억(In Eok Cho),이성욱(Seang Wock Lee),오세인(Se In Oh) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The bio diesel is one of the most favored candidates for alternative fuel in diesel engine. This research aims to understand the physics of spray and combustion characteristics of a bio-diesel fuel in a constant volume chamber. For spray visualization, bio-diesel was injected into a combustion chamber and take a photographed by high speed camera at various condition. To investigate heat-release rate and flame propagations, spark was ignited on hydrogen premixed and then bio-diesel injected. In addition, parametric study was made by varying geometry of combustion chamber and temperatures of fuels and injection pressures. This technology may contribute to improve the performance of bio-diesel engine and reduce emissions in the future.
손용기(Yong-gi Son),유정호(Jeong-ho Yoo),유영숙(Young-sook Yoo),김종춘(Jong-choon Kim),이성욱(Sung-wook Lee),조인억(In-eok Cho) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As the concerns regarding global worming were increased, the pressure of greenhouse gas(GHG) emission reduction on mobile source was also increased. Carbon Dioxides contribute over 90% of total GHG emission and the mobile source occupies about 20% of this CO₂ emission. Therefore automotive exhaust is suspected to be one of the major reasons of the rapid increase in greenhouse effect gases in ambient air. In this study, in order to investigate CO₂ emission factor characteristics from passenger cars(PC), which is the most dominant vehicle type in Korea, 103 vehicles were tested on the chassis dynamometer. CO₂ emissions and fuel efficiency were measured. The emission factor characteristics by displacement, gross vehicle weight, vehicle speed and CVS-75/vehicle speed mode were discussed. Test modes were vehicle speed modes and CVS-75 mode that have been used to develop emission factors and to regulate for light-duty vehicle in Korea. It was found thai CO₂ emissions showed higher large displacement, heavy gross vehicle weight, low vehicle speed and CVS-75 mode than small displacement, light gross vehicle weight, high vehicle speed and vehicle speed mode, respectively. From these results, correlation between CO₂ emission and fuel efficiency was also determined. The results of this study will contribute to domestic greenhouse gas emissions calculation and making the national policy for climate change.
정적연소기내 천연가스의 예혼합 및 직접분사식 연소특성에 관한 연구
기완수(Wan Soo Kee),조인억(In Eok Cho),이성욱(Seang Wock Lee),강호인(Ho In Kang),한영출(Young Chul Han) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this work is to obtain fundamental data about performance of ignition and combustion with high pressure injection of CNG. This experiments were conducted under a constant volume combustion chamber that can change ignition times, injection pressure, then the combustion pressure were investigated. Optical device was used to the visualization of combustion process. This test provided the fundamentals of CNG such as ignition and combustion characteristics under a high pressure direct injection system and the experimental results were also compared with one obtained by using a computer simulation technique.
이원석(Won Seok Lee),조인억(In Eok Cho),이성욱(Seang Wock Lee),한영출(Young Chul Han),나완용(Wan Yong Rha),강호인(Ho In Kang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study aims to provide a fundamental data for directly injected hydrogen fuel engines. Spray, ignition and combustion characteristics of hydrogen were studied using constant volume chamber. For spray visualization, hydrogen was vertically injected into a combustion chamber at various condition (injection pressure) and a laser beam horizontally penetrated into the combustion chamber for the shadowgraph photography in optical methods. And to investigate heat-release rate and flame propagations, spark was ignited on hydrogen injected at the different time after injection and the duration of injection was also changed. Processes of ignition and combustion were analyzed by heat-release rate calculated by pressure history and were observed by shadowgraph photography. The results gave much knowledge of spray, ignition and combustion characteristics of hydrogen.