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스파크점화 엔진에서 천연가스와 수소의 희박연소 성능 비교
박현욱,이준순,오승묵,김창업,이용규,강건용,Park, Hyunwook,Lee, Junsun,Oh, Seungmook,Kim, Changup,Lee, Yonggyu,Kang, Kernyong 한국분무공학회 2021 한국액체미립화학회지 Vol.26 No.4
Lean combustion performance of natural gas and hydrogen was compared in a spark-ignition engine. The lean combustion engine operation with natural gas was limited due to combustion instability at an excess air ratio (EAR) above 1.8. The total hydrocarbon (THC) emissions increased significantly with increasing EAR. The nitrogen oxides (NO<sub>X</sub>) emissions were also high due to the limitation of increasing EAR. The lean combustion engine operation with hydrogen showed superior combustion stability as well as low THC and NO<sub>X</sub> emissions, even at high EARs. However, boosting technology was required to reach the high EARs.
수소의 혼합 비율에 따른 수소/디젤 혼소 엔진의 연소 및 배기 특성 파악
박현욱(Hyunwook Park),배충식(Choongsik Bae) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
The effects of hydrogen (H₂) ratio on combustion and emission characteristics in a H₂/diesel dual-fuel engine were investigated. Dual-fuel strategy was applied to improve the control of combustion phasing. The combustion phasing was retarded with increasing H₂ fraction. This can be explained by both reduced diesel concentration and chemical effect of H₂, which reduce the heat release rate during the low temperature reaction stage. Hydrocarbon and carbon monoxide emissions of the engine were decreased drastically when H₂ ratio was increased.
천연가스 스파크점화 엔진 발전기에서의 에너지 손실 분석
박현욱 ( Hyunwook Park ),이준순 ( Junsun Lee ),오승묵 ( Seungmook Oh ),김창업 ( Changup Kim ),이용규 ( Yongkyu Lee ),강건용 ( Kernyong Kang ) 한국분무공학회 2020 한국액체미립화학회지 Vol.25 No.4
Stoichiometric combustion in spark ignition (SI) engines has an advantage of meeting future stringent emission regulations. However, the drawback of the combustion is a lower thermal efficiency than that of lean burn. In this study, energy losses in a natural gas stoichiometric SI engine generator were analyzed to establish a strategy for improving the generating efficiency (GE). The energy losses were investigated based on dynamometer and load bank experiments. As the intake manifold pressure increased in the dynamometer experiment, the brake thermal efficiency (BTE) increased mainly due to the reduction in the pumping and mechanical losses. In the load bank experiment, the generating power and GE increased with the increased intake manifold pressure. The generating power and GE were lower than the brake power and BTE due to the cooling fan power and the losses in the generator.