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가솔린엔진 열효율 향상을 위한 신개념 단열 연소실 연구
백홍길(Hong-kil Baek),이승우(Seung Woo Lee),홍웅표(Woongpyo Hong),김보경(Bokyung Kim),이동규(Dongkyu Lee) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
This paper investigates combustion chamber coated with HMC proprietary new material containing nano-porous aerogel to improve thermal efficiency of spark-ignition engine. Previous Adiabatic engines, such as ceramic coated engines, caused constantly high temperature on combustion wall surface during the whole cycle including the intake stroke. These resulted in decrease of volumetric efficiency and increase the occurrence of engine knock. In order to overcome these problems, surface temperature of combustion chamber follows the transient gas temperature within one cycle, which decreases heat loss with the prevention of intake air heating. It is necessary that coating has the thin thickness, low thermal conductivity and low volumetric heat capacity due to these requirements. The purpose of this study is to suggest HMC proprietary coating material and to illustrate the effects of coated combustion chamber applied to spark-ignition engine on piston and cylinder head surface temperature, fuel economy. Finally, this research is to focus on developing insulation materials and coating process to improve the coating durability under high load and temperature cyclical conditions encountered in the real engine.
가솔린 연료 개질 기술을 이용한 SI 엔진 열효율 향상
이승우(Seung Woo Lee),백홍길(Hong-kil Baek),오희창(Heechang Oh),이종혁(Jonghyeok Lee),정진영(Jinyoung Jung),김준석(Joonsuk Kim),송순호(Soonho Song),전광민(Kwang Min Chun) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
A well-known effective way to improve SI engine thermal efficiency is to use hydrogen mixed with gasoline. Hydrogen, even in small amounts, it makes flame speed faster, knock mitigation and improves combustion stability. These benefits enable higher compression ratios, higher EGR rates and improved SI engine thermal efficiency. Fuel reforming is one way to get hydrogen from the internal combustion engine, using hydrocarbon fuel, exhaust gas steam and heat, hydrogen reformation is achieved using species already available in the exhaust gas. However, for steam reforming to be valuable, the catalyst temperature should be above its light off temperature under engine operating condition. This study investigates how the combustion characteristics are affected by the addition of reformed hydrogen in the presence of EGR on a 4 cylinder turbo gasoline direct injection (TGDI) engine. It is in the current research that the combustion speed is increased when hydrogen from on-board fuel reforming system is supplied into combustion chamber by means of EGR gas. It is also found that total engine fuel consumption is improved with EGR limit expansion and knock mitigation. And it is confirmed that catalyst degradation should be prevented under real engine operating condition for serial production.
이승우(Seung Woo Lee),이경현(Kyeonghyeon Lee),백홍길(Hong-kil Baek),김용래(Yongrae Kim),박철웅(Cheolwoong Park),최영(Young Choi) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Regulations on carbon dioxide emissions are being strengthened worldwide for reasons such as greenhouse gas reduction and carbon neutrality. In order to meet these regulations, the market for battery electric vehicles and fuel cell vehicles is expanding rather than vehicles equipped with internal combustion engines. However, even an internal combustion engine can dramatically reduce carbon dioxide emissions if hydrogen. So in this study, hydrogen fueled engine is designed and manufactured based on the existing gasoline spark ignition engine shows the possibility and potential of a pollution-free internal combustion engine through basic performance evaluation results.