http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
HSDI 디젤엔진 흡기메니폴드의 기통간 EGR 분배성에 대한 1D/3D 연동해석
박남섭(Namseob Park),이제형(Jehyung Lee),여권구(Gwonkoo Yeo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Increasingly stringent exhaust emission regulations, which are expected to come into force within the next couple of years will require substantial reduction of NOx as well as particulate emissions. The small-bore, 01 Diesel engines currently being developed may have to use than 50% recirculated exhaust gas in the intake charge to control NOx emission. The compact geometry of the intake systems may lead to mixing problem with these large quantities of EGR and fresh air prior to induction into the cylinder, and lead to cylinder-to-cylinder maldistribution. This maldistribution could possibly result in a situation where is excessive NOx emissions from cylinders getting too little EGR, along with excessive smoke emissions from those cylinders that get too much EGR. In this work, numerical simulation is applied to improve cylinder-to-cylinder distribution of EGR in a 1.5-L Direct-Injection (DI) Diesel engine using 3D CFD coupled with ID engine cycle simulation. Through a combined effort of modeling, design and simulation, manifolds were developed that improved EGR distribution over the original manifolds while minimizing design changes to engine components. The results confirm the capabilities of the CFD, and in addition illustrate interesting insight regarding the cylinder-to-cylinder EGR distribution.
난류 예혼합연소 화염의 LES 및 산업용 연소기 개발을 위한 LES 응용 해석 기술
박남섭(Namseob Park),류종혁(Jonghyuk Ryu) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
LES results of turbulent premixed combustion flows are introduced by using the dynamic sub-grid scale model based on G-equation describing the flame front propagation. The turbulent premixed combustion flows around bluff body and over backward facing step are analyzed to validate present formation. LES of swirling partially premixed combustion flame is also performed to conform the predictive capabilities of LES model and to prompt our understanding for the combustion flows over double cone swirl burner combustor by using CFD-ACE+ commercial code.
MCFC 발전시스템 적용 촉매연소기의 혼합 특성 향상을 위한 Static Mixer 의 유동에 관한 수치적 연구
김종민(Chongmin Kim),박남섭(Namseob Park),김만영(Man Young Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.3
In this work a numerical study to find the characteristics of the internal flow and mixing process has been conducted in a static mixer used in the system of catalytic combustor of the fuel cell power plant. After introducing the model description and final governing equations the present numerical approach is applied to the analysis of static mixer, which may have one or more helical elements inside the circular tube by changing such various parameters as incoming mass flow rates and the number of helical elements. The results show that although the static mixer is efficient in mixing fuel and air, more optimization processes are required to achieve the appropriate mixing characteristics in front of the honeycomb type catalytic combustor used in the MCFC power plant
조건 평균 방법을 이용한 소형 고속 직분식 디젤 엔진의 난류 연소 3차원 모사 연구
한인석(Insuk Han),허강열(Kang Y.Huh),박남섭(Namseob Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Turbulent spray combustion in a direct injection diesel engine is investigated numerically by the first order Conditional Moment Closure (CMC) model. This model allows employment of detailed chemistry for simulation of autoignition, nonpremixed combustion and pollutant formation in a consistent manner. KIVA 3V and CHEMKIN 2 are used to solve the governing equations for flow field and chemistry. Simplified CMC equations are applied to with KIVA adopting a complicated moving grid system. Validation is performed against experimental pressure data for different injection conditions and engine speeds with discussions for obvious deviation in the early combustion phase with and without pilot injection.<br/>