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스파크 점화기관 냉간 시동시 플라즈마 광촉매 복합장치와 스월 2차 공기분사에 의한 탄화수소 화합물 저감에 관한 실험적 연구
이택헌(Taek-heon Lee),신영기(Yoonggy Shin),전광민(Kwang Min Chun) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
In addition to the previous studies about model gases and engine-out hydrocarbon reaction through the plasma photocatalyst combined reactor, secondary air injection effects and synergy effects with the reactor were investigated. With secondary air injection only, the combustion products such as acetylene increased most highly because the large amounts of these components under rich condition at cold stan were not oxidized sufficiently due to the initially lower frame temperature from secondary air dilution. But the fuel components such as iso-pentane were reduced to 50% maximum. Olefins did not show any peculiar trends and, when excess 0₂secondary air was injected, additional oxidations were measured in small amounts.<br/> In the simultaneous application with plasma-photocatalyst reactor, there were not remarkable changes with the non-fuel components and fuel paraffins compared with the secondary injection only However the olefinic components were dramatically decomposed more than 95% except iso-butylene which was decomposed by 80%.<br/>
흡기중 수증기 함량이 스파크 점화기관의 연소 및 노킹에 미치는 영향에 관한 실험적 연구
이택헌(T. H. Lee),전광민(K. M. Chun) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.1
In this study, the effects of water vapor in inlet air on combustion efficiency, general perform-ance, knock characteristics and emission gas concentration were investigated through the experi-ments of combustion and vibration analyses, emission gas analysis by changing water vapor quan-tity in inlet air with temperature and humidity auto control unit.<br/> With partial vapor pressure increase, the brake torque at wide open throttle status decreased and the average ignition delay angle increased, IMEP (indicated mean effective pressure) de-creased due to the late maximum cylinder pressure crank angle. Knocking was measured using the integral and 3rd derivatives of filtered cylinder pressure as knock intensity, which matched well with the method of frequency power spectrum of block vibration signal.Water vapor in intake air had influence on the spark knock sensitivity. With the increase of water vapor content in in-take air NOx emission was decreased and HC emission was increased.
흡기중의 수증기분압과 점화시기 및 연료 변화에 따른 스파크 점화기관의 화염 전파 특성 분석
이택헌(T. H. Lee),전광민(K. M. Chun) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.5
In this study, the effects of water vapor in inlet air, spark advance and fuel type on the spark ignition engine were investigated through the experiments of combustion and flame arriving pattern analysis using ionization probe. The results of flame propagation experiment using ionization probe show that the flame which ignited from spark plug located at the center of the combustion chamber propagated faster in exhaust side than in intake side due to the mixture flow motion inducted into combustion chamber from intake tumble port at all conditions. And as the partial vapor pressure increased, the flame propagation became slower in all direction. Especially effects were greater for intake side than the exhaust side.<br/>