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LPG 가스분사 방식 연료공급시스템의 관로 유동해석에 관한 연구
윤정의,김명환,남현식,정태형,Yun, Jeong-Eui,Kim, Myung-Hwan,Nam, Hyeon-Sik,Jeong, Tae-Hyuung 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
The gaseous fuel injection (GFI) type in LPG fuel supply system has more advantage than the liquified fuel injection type from the viewpoint of durability and cost reduction. But in GFI system, to control pressure and temperature of gaseous fuel is needed to get precision fuel metering for the compressible characteristic of gaseous fuel. In this study, the effects of pressure and temperature on the fuel metering was simulated by commercial flow network analysis package, Flowmaster. And the fuel composition effects on the fuel metering were also studied to figure out the fuel metering characteristics.
가변 흡기시스템에 의해 유도되는 흡입공기의 유동특성 평가를 위한 새로운 3차원 회전유동 지수 관한 연구
윤정의(Jeong-Eu Yun),남현식(Hyeon-Sik Nam),김명환(Myung-Hwan Kim),민선기(Sun-Ki Min),심대곤(Dae-Gon Sim),박병완(Pyeong-Wan Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
It is very important to clarify the 3-D angular flow characteristics of in-cylinder bulk motion in the developing process of variable induction system. In-cylinder flow induced by variable induction system is very complex, so we can not describe the in~cylinder bulk flow characteristics using the conventional swirl or tumble coefficient. In this study, we introduced the new 3-D angular flow index, angular flow coefficient(N_B), for in-cylinder bulk flow characteristics. And also, to confirm the index, we carried out the steady flow rig test for intake port of test engine varying valve lift on the test matrix.
가변 흡기시스템에 의해 유도되는 흡입공기의 유동특성 평가를 위한 새로운 3차원 회전유동 지수에 관한 연구
윤정의(Jeong-Eui Yun),남현식(Hyeon-Sik Nam),김명환(Myung-Hwan Kim),민선기(Sun-Ki Min),심대곤(Dae-Gon Sim),박병완(Pyeong-Wan Park) 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.1
It is very important to clarify the 3-D angular flow characteristics of in-cylinder bulk motion in the developing process of variable induction system. In-cylinder flow induced by variable induction system is very complex, so we can not describe the in-cylinder bulk flow characteristics using the conventional swirl or tumble coefficient. In this study, we introduced the new 3-D angular flow index, angular flow coefficient(N<SUB>B</SUB>), for in-cylinder bulk flow characteristics. And also, to confirm the index, we carried out the steady flow rig test for intake port of test engine varying valve lift on the test matrix.
흡기시스템을 통해 실린더로 유도되는 공기의 3차원 Bulk Motion Index 개발 (Ⅱ)
윤정의(Jeong-Eui Yun),남현식(Hyeon-Sik Nam),김명환(Myung-Hwan Kim),민선기(Sun-Ki Min),박병완(Pyeong-Wan Park),김기성(Ki-Seong Kim) 대한기계학회 2006 大韓機械學會論文集B Vol.30 No.11
Recently, because the variable induction systems are adopted to intake system, in-cylinder flow induced by induction system is very complex. Therefore it is very difficult to describe the in-cylinder bulk flow characteristics using the conventional swirl or tumble coefficient. In this study, in order to clarify the 3-D angular flow characteristics of in-cylinder bulk motion in the developing process of variable induction system, we introduced the new 3-D angular flow index, angular flow coefficient(NB) Finally, to confirm the index, we carried out the steady flow rig test for intake port of test engine varying valve lift on the test matrix.
엔진 흡기시스템 개발 시 사용하는 텀블유동 시험장치의 고찰
윤정의(Jeong-Eui Yun),김명환(Myung-Hwan Kim),남현식(Hyeon-Sik Nam),민선기(Sun-Ki Min),심대곤(Dae-Gon Sim),박병완(Pyeong-Wan Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Tumble flow test rig has been used as the useful tool in the developing intake system because major flow pattern induced by intake port of DOHC engine is tumble. Angular momentum of in-cylinder tumble flow can not be directly measured by impulse torque meter in the test rig like that of in-cylinder swirl flow due to rotational axis of the flow. Therefore the adaptor to transform tumble to swirl flow must be adapted in the test rig. In this study, using the commercial CFD code STAR-CD, we studied the effects on measured results due to the variation of the major design variables in the adaptor, tube length (L), tube diameter (D) and cylinder height(H). The effect of the attached angle(θ) of the test head to the adaptor also was simulated.
엔진 흡기시스템 개발 시 사용하는 텀블유동 시험장치의 고찰
윤정의(Jeong-Eui Yun),김명환(Myung-Hwan Kim),남현식(Hyeon-Sik Nam),민선기(Sun-Ki Min),심대곤(Dae-Gon Sim),박병완(Pyeong-Wan Park) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.6
Tumble flow test rig has been used as the useful tool in the developing intake system because major flow pattern induced by intake port of DOHC engine is tumble. Angular momentum of in-cylinder tumble flow can not be directly measured by impulse torque meter in the test rig like that of in-cylinder swirl flow due to rotational axis of the flow. Therefore the adaptor to transform tumble to swirl flow must be adapted in the test rig. In this study, using the commercial CFD code STAR-CD, we studied the effects on measured results due to the variation of the major design variables in the adaptor, tube length (L), tube diameter (D) and cylinder height(H). The effect of the attached angle(θ) of the test head to the adaptor also was simulated.
LPG 가스분사 방식 연료공급시스템의 관로 유동해석에 관한 연구
윤정의(Jeong-Eui Yun),김명환(Myung-Hwan Kim),남현식(Hyeon-Sik Nam),정태형(Tae-hyuung Jeong) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The gaseous fuel injection (GFI) type in LPG fuel supply system has more advantage than the liquified fuel injection type to overcome SULEV emission regulation. But in GFI system, to control pressure and temperature of gaseous fuel is needed to get precision fuel metering for the compressible characteristic of gaseous fuel. In this study, the effects of pressure and temperature on the fuel metering was simulated by commercial flow network analysis package, Flowmaster. And the fuel composition effects on the fuel metering were also studied to figure out the fuel metering characteristics.
윤정의(Jeong-Eui Yun),김명환(Myung-Hwan Kim),남현식(Hyeon-Sik Nam),정태형(Tae-Hyung Jeong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The vaporizer is the core component in the LPG gas injection engine. Its major function is to change liquid phase LPG fuel into gas phase using hot coolant as heat source. Therefore, it is important to improve the efficiency of heat exchange between coolant and LPG fuel. In this study, using the commercial thermal and fluid analysis code STAR-CD, we studied computational thermal and fluid analysis to figure out the heat exchange phenomena in vaporizer. Finally, the comparison between original and modified coolant passage was simulated on the efficiency of heat exchange.