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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.
윤정의(Jeong-Eui Yun) 한국트라이볼로지학회 2006 한국윤활학회지(윤활학회지) Vol.22 No.1
It is very important to control pressure and flow rate distribution on each component of engine lubrication network. Sometimes many kinds of orifice are used to control flow rate in the hydraulic lubrication field. In this study orifices were adopted on the lubrication network to control oil flow rate distribution. And unsteady transient flow network analysis was carried out to find out the effects of orifices on the engine oil circuit system.
폐수 이송용 원심펌프의 성능해석에서 표면 거칠기의 영향
윤정의(Jeong-Eui Yun),김주호(Joo-Ho Kim) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.2
본 연구는 폐수처리용 원심 펌프 설계과정에서 수행하는 3차원 유동해석에 있어서 표면 거칠기를 고려한 해석 결과와 고려하지 않은 해석 결과가 성능 예측에 미치는 영향을 살펴보고자 수행하였다. 이를 위해 비교적 기하학적 형상이 복잡한 폐수처리용 원심펌프의 표면 거칠기 변화가 유동 해석 결과에 미치는 영향을 평가하였다. 그리고 실제 해석 대상 펌프를 사용한 실험 결과 값과 해석 결과 값을 서로 비교 해봄으로써 표면 거칠기를 고려한 펌프의 해석 값과 고려하지 않은 해석 결과 값 차이에 대한 정량적인 분석을 제시하였다. 그 결과, 해석 시 표면 거칠기를 고려한 해석결과는 실험결과와 잘 일치하는 함을 보였으며, 표면 거칠기는 펌프의 성능해석에 약 7% 범위에서 영향을 준다는 것을 확인할 수 있었다. This study was performed to evaluate the effect of surface roughness on pump performance. To this end this, using commercial codes, ANSYS CFX and BladeGen, we simulated pump performance in terms of efficiency, head and shaft power, both with and without surface roughness. Finally simulation and experiment results were compared for a quantitative analysis. The results of this comparison showed that surface roughness led to an about 7% reduction in pump efficiency.
가스분사 방식 LPG 엔진의 연료공급시스템 관로 유동해석
윤정의(Jeong-Eui Yun) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.10
LPG 분사시스템의 경우 액상 및 기상 인젝터를 사용하는 두 가지 방식이 있으며, 가스 분사 방식의 경우 내구성 및 가격 측면에서 장점이 있지만 가스의 압축성 특성으로 인한 정밀 유량제어에 어려움이 있다. 본 연구에서는 가스분사 방식 LPG 연료 분사 시스템에서 정밀 유량 제어를 위한 수단으로 헬름홀쯔 공진기를 사용하는 방안을 제시하였다. 그리고 상용 유동해석 프로그램인 Flowmaster를 사용하여 대상 자동차의 연료 시스템에 대해 유동해석을 통해 최적의 공진기를 설계방안을 설계하였으며, 공진기 설치 후 개선 효과를 제시하였다. The gaseous fuel injection(GFI) type of LPG fuel-supply system is more advantageous than liquefied fuel injection(LFI) from the viewpoint of durability and cost reduction. However, compared with LFI types of LPG fuel-supply systems, in the GFI systems it is difficult to achieve precision fuel metering because of the compressible characteristic of the gaseous fuel. In this study, a Helmholtz resonator is proposed as an appropriate system for precision fuel metering in GFI systems, and the effects of the Helmholtz resonator on the fuel metering are simulated by the commercial flow-network-analysis package Flowmaster.
냉 시동 개선을 위해 2차 공기 공급 시스템을 채택한 촉매 변환기내배기가스 해석
윤정의(Jeong-Eui Yun),김성훈(Sunghoon Kim),지선호(Sunho Ji) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this paper, emission analysis during cold start period of CVS-75 mode in LPG vehicle was performed to find out proper operating conditions of SAI(Secondary Air Injection) system. In order to meet SULEV target, the simulated emission system had a SAI system as well as a MCC(Manifold Catalytic Converter) and a UCC(Under body Catalytic Converter). Using commercial 1-D code AMESIM, in which 7 step global surface chemical reactions of Langmuir-Hinshelwood type were adopted, transient emission analysis in the exhaust system during cold start period of CVS-75 mode were carried out to figure out the effects of flow rate, duration of supply air on HC, CO, NO emission.
[연료 및 윤활유부문] Tilting Test Rig를 활용한 엔진 윤활시스템 안정성평가
윤정의(Jeong-eui Yun),이국열(Kuk-yeal Lee) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Engine lubrication system is generally affected by vehicle driving conditions, which are composed of acceleration, braking deceleration and accelerating during comering. The major reason is due to the oil pan system in \\hich oil is directly influenced by inertia force caused by vehicle driving conditions. Therefore, to confirm safety of engine lubrication system inertia force effects are also considered in the developing state. To do this we caused the engine tilting tests using ourselves made test rig. Verifying the test results we also measured the inertia effects on the engine lubrication system using the vehicle. Through the comparison study between two kinds of results we obtained that the tilting test rig was very useful to confirm the safety evaluation of engine lubrication system.