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- 저자 : 정진영 ( Jung Jinyoung ) (검색결과 81 건)
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다운사이징 GDI엔진에서 TiAl 터빈휠 터보차저의 적용에 따른 성능 특성
정진영(Jinyoung Jung),오희창(Heechang Oh),배충식(Choongsik Bae) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
In this study, steady and transient tests in a multi-cylinder engine were carried out to investigate performance of turbocharger equipped with TiAl alloy turbine wheel. TiAl alloy has low rotational inertia compared to Inconel 718 alloy, conventional turbine wheel material. In the result of the engine experiment, the boost pressure and turbocharger speed started to increase at 12 bar BMEP. In addition, the turbine wheel faced under pulsating flow condition even in steady engine operation condition. The compressor total-to-total pressure ratio of TiAl turbocharger was higher under wide open throttle condition due to low inertia of TiAl turbine wheel. The efficiency of TiAl turbocharger was also higher than that of Inconel 718 turbocharger. In the transient test, time for boost pressure build-up of TiAl turbocharger was shorter than that of Inconel 718 turbocharger, and turbocharger speed of TiAl turbocharger was also higher. However, even though time for pick engine torque was shorter in case of TiAl turbocharger, the pick engine torque of Inconel 718 turbocharger was higher.
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희박성층연소조건의 분무유도식 DISI 엔진에서 LPG연료의 연소 특성
정진영(Jinyoung Jung),이민석(Minseok Lee),오희창(Heechang Oh),배충식(Choongsik Bae) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this study, a single cylinder engine experiment under lean stratified conditions was carried out to investigate combustion and emission characteristics of a spray guided direct injection spark ignition engine fueled with gasoline and LPG. In the result of the engine experiment, the flammable window limited by misfire in the case of LPG was narrower than that of gasoline. IMEP in case of LPG was higher where no misfire occurred even though the maximum heat release rate was lower. This was because that combustion phase was retarded, leading to reduced negative work and low in-cylinder temperature during combustion. HC emissions referring the combustion efficiency were higher while NOx and smoke emissions were lower than those of gasoline. In the result of the a experiment to visualize the mixture formation, the spray penetration of LPG was just enough to be ignitable where no misfire occurred and was shorter than that of gasoline. The penetration of spray became shorter as injection timing was retarded, which was the reason of misfire leading the narrower window. This result is likely be due to the high evaporating characteristic of LPG fuel.
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