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홍순성(Soonseong Hong),이진호(Jinho Lee),민선기(Sunki Min),김숭기(Soongkee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
DFSS (Design for Six Sigma) is a very useful method to optimize product design in various fields of the industry. This paper presents the implementation of the DFSS method to optimize an engine intake manifold with PDA system. The focus of optimization is to maximize the swirl strength and mass flow rate in the cylinder chamber. There are so many factors that affect the swirl strength and mass flow rate in intake manifold system, but only six main control factors such as plenum shape, primary and secondary length, port diameter, primary pipe section shape, etc. are adopted. The L18 orthogonal table is used for calculating CFD simulation to evaluate the swirl number and mass flow rate in the cylinder chamber.
홍순성(Soonseong Hong),심성훈(Sunghun Shim),이재욱(Jaewook Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
These days many automakers are trying to improve both fuel consumption efficiency and performance through engine downsizing. To achieve the objective, it is very efficient to apply the turbo charger system to provide a large amount of air to increase an engine performance. The intake system including a manifold and a port plays a role to make a tumble flow as well as provide an air mass flow to the combustion chamber. A high tumble flow is necessary in a turbocharged engine to prevent knock and SPI(Stochastic Pre-Ignition) due to the high pressure and temperature in a chamber. CMCV(Charge Motion Control Valve) is recently applied to many engines for a tumble flow, but it requires high cost, so the high tumble intake port without CMCV was developed in this study. TACM(Tumble Axis Control Method) was applied to develop a high tumble port, and as a result, the flame propagation speed got faster by average 9.1% compared to the base port. A combustion chamber with the flat squish was adopted to help a strong tumble motion and augment combustion. This paper shows how to develop the high performance PFI turbocharged engine by CFD analysis which was performed to optimize an intake port.
텀블 유동 제어 방법을 이용한 가솔린 엔진의 고효율 연소실 개발에 관한 해석적 연구
홍순성(Soonseong Hong),심성훈(Sunghun Shim),김충식(Choongsik Kim) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
최근에 가솔린 엔진에 있어서 엔진의 성능 및 연료 소비 효율을 개선하기 위해 다양한 종류의 엔진이 도입되고 있다. 그 중에 엔진의 downsizing을 통해 엔진 자체의 무게를 줄여 연비와 성능을 개선하는 추세가 뚜렷하게 나타나고 있다. 이를 구현하기 위해 터보 차저를 장착하여 축소된 실린더 체적에 압축된 공기를 공급하는 기술이 핵심이 되었다. 이에 따라 연소실 내에 과급된 공기와 분사된 연료를 짧은 시간 동안에 균일하게 혼합시켜 주는 것이 연소 효율을 높이기 위한 필수적인 과제로 대두 되었다. 또한 과급 공기로 인한 연소실 내 압력 상승과 온도 상승이 노킹 현상을 촉진시키기 때문에 이것을 방지하기 위해서도 연료와 공기의 균일 혼합은 매우 중요한 요소가 되었다. 이 연구의 목적은 연소실의 텀블 유동을 최적화하여 짧은 시간 내에 연료와 공기의 균일 혼합을 가능하게 하는 방법을 개발하는 것이다. CMCV (Charge Motion Control Valve)는 흡기 매니 폴드 및 흡기 포트에 설치되어 연소실 내에 스월(swirl)이나 텀블(tumble) 유동을 만들어 낼 수 있지만 비용이 많이 들고 유통 저항이 커지는 단점이 있다. 본 연구에서는 텀블 유동을 제어하는 방법을 개발하여 별도의 장치 없이 흡기포트 형상에 적용한 결과를 제시하고 있다. 이 방법은 연소실 내에서 형성되는 다축 (multi-axes) 텀블을 방지하고, 단일축(single axis)을 가진 이상적인 텀블 유동을 생성시키는 기술이다. 특히 점화 플러그 근처의 강력한 난류 운동 에너지와 균일한 혼합기를 만들기 위해서는 이상적인 텀블의 형성이 필수적이며, 이는 빠른 화염면 전파 속도와 함께 안정적인 연소를 가능케 하여 연소 효율을 높여 줄 수 있다. CFD(Computational Fluid Dynamics) 해석을 통해 혼합기의 균일도, 난류 운동 에너지 및 연소 시간 등을 산출하였고, 이는 연소 효율을 예측하기 위해 사용 되었다. 마지막으로 CFD 해석 결과는 다이노(dyno) 시험 결과와 비교하여 검증 되었다.
홍순성(Soonseong Hong) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
In order to satisfy ULEV emission regulation. the improvement of flow uniformity in catalytic converter is essential. The flow uniformity plays important roles in improvement of converting efficiency, light-off behavior. and also durability of monolith. This study is concerned with approach to improve catalyst flow uniformity using swirl effect. Through the fundamental study. two kinds of catalytic converters were selected and performed to investigate the flow distribution of exhaust gases. One case has only straight flow inlet. but the other has swirl inlet as well as straight inlet. As a result. the second case having swirl effect demonstrated more efficient flow than the first case.
CFD 및 GT-Power 해석을 이용한 가솔린 Dual-Injector 엔진의 성능 개선에 관한 연구
김충식(Choongsik Kim),홍순성(Soonseong Hong),이재욱(Jaewook Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Optimal intake system design for a dual-injector PFI (Port Fuel Injection) application was studied by using CFD analysis and the performance improvement was predicted by GT-Power analysis. Dual-injector PFI system provides better charge cooling and combustion stability which makes it possible to achieve engine performance and fuel efficiency improvement on conventional MPFI system. Since fuel injection system change from a conventional PFI to a dual-injector system was tried in this study, intake manifold and ports designs also should be changed to incorporate the dual-injector system and to maximize the performance and fuel efficiency gain. A number of intake port design variants were evaluated by using CFD from tumble and flow capacity perspectives and the intake manifold design was proposed to fit the selected port design. As intake system design was decided, engine performance simulation was carried out to project engine performance improvement with dual-injector based engine hardware. From the series of development activities, dyno test showed engine torque increase especially at low engine speeds and BSFC improvement at key part load conditions.
1D/3D Simulation을 통한 가솔린 터보엔진의 윤활 시스템 예측에 대한 연구
심성훈(Sunghun Shim),홍순성(Soonseong Hong),김충식(Choongsik Kim) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
As turbo-charged gasoline engines are getting more popular and general, engine lubrication becomes more important in terms of engine development because turbo-charged gasoline engines have the complicated oil line than naturally aspirated engines. In this study, the lubrication system analysis (1D CFD) was conducted with AMESim to suggest oil pump capacity and engine idle speed on lubrication system by investigating component pressure. The oil pump analysis (3D CFD) was conducted with Pumplinx to optimize oil pump performance by evaluating flow irregularity and performance of oil pump including volumetric efficiency and cavitation. Analysis result shows that the flow irregularity was improved by 39% and the volumetric efficiency by 3% at low engine speed. In addition, the averaged friction torque was reduced by 2.1% at entire engine speed. And also shows that predicted pressure of component have the averaged 5.9% tolerance in comparison with rig test result. Engine lubrication analysis using 1D, 3D simulation tool is helpful to engine development and can provide essential information of lubrication design to engineer at initial phase.