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Otgonbat Pionyer(어트겅바트피어네르),Narankhuu Jamsran(나랑후잠스랑),Ocktaeck Lim(임옥택) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This study was computationally investigated the effects of EGR and boost pressure to confirm the mechanisms for extending operation range and reducing NOx emission of a HCCI engine fueled with natural gas. The CHEMKIN-PRO was used to perform the numerical analysis. To set boundary of operating range, boost pressure was varied from 0.1MPa to 0.2MPa and EGR was varied from 10% to 50%. In the result, HCCI fueled with natural gas was found single stage heat release which was composed with the thermal-ignition preparation and thermal ignition. These two stages were determined mainly by H₂O₂ loop reactions, H2-O2 system reactions respectively. Also, mole fractions of H₂O₂, CH₂O and OH were considered to effect on those stages. The H₂O₂ loop reactions begin to active when the OH formation by the H₂O₂ +M → 2OH + M become at about 950K. The H₂-O₂ system reactions were begun when the transient temperature reaches over than 1200K in this study. As the increase of amount of EGR, number of important reactions and transient temperature of the contribution matrix were degreased. When we use intake pressure, number of important reactions and transient temperatures of the contribution matrix were increased. Finally, NOx emission was lower due to in-cylinder temperature lower.
합성가스 스파크점화 과급 엔진에서 희박 연소를 통한 열효율 및 배기 개선
박현욱 ( Hyunwook Park ),이준순 ( Junsun Lee ),나랑후잠스랑 ( Narankhuu Jamsran ),오승묵 ( Seungmook Oh ),김창업 ( Changup Kim ),이용규 ( Yonggyu Lee ),강건용 ( Kernyong Kang ) 한국분무공학회 2021 한국액체미립화학회지 Vol.26 No.1
Lean combustion was applied to improve the thermal efficiency and emission in a single-cylinder, spark-ignition engine fueled with syngas. Under naturally aspirated conditions, the lean combustion significantly improved the thermal efficiency compared to the stoichiometric combustion, mainly due to the reduction in heat transfer loss. Intake air boost was applied to compensate the low power output of the lean combustion. The gross indicated power of 24.8 kW was achieved by increasing the intake pressure up to 1.6 bar at excess air ratio of 2.2. The nitrogen oxides showed near zero level, but the carbon monoxide emission was significant.