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산화제 결핍 분위기에서의 층류 확산화염내 OH, PAHs 및 그을음 분포
심성훈,신현동,Shim, Sung-Hoon,Shin, Hyun-Dong 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.10
We investigate the flame behavior and spatial distribution of OH, PAHs and soot in a confined buoyant diffusion flame with decrease of the coflowing air flow rate. Direct photographs and Schlieren images represent that flame is Ally occupied by blue flame and becomes unstable, which is partially detached to the fuel nozzle tip in a near extinction flame under extremely reduced oxidizer condition. Laser induced fluorescence profiles clearly shows that OH is still generated in near-extinction flame, although intensity becomes weak with decreasing air flow rate. But soot scattering image cannot be seen any more in an oxidizer deficient ambience and simultaneously the PAHs are widely distributed downstream. These results are due to that a decrease of oxygen concentration in the combustion chamber leads to a temperature drop of flame, as a consequence, to a delay in soot growth and to a expanding of the PAHs, as soot precursors.
SiC 필라멘트를 이용한 소염 직전의 확산화염 온도 계측
심성훈,신현동,Shim, Sung-Hoon,Shin, Hyun-Dong 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.11
The thin SiC filament technique has been employed to identify the possibility of measuring flame temperature, and especially unstable near-extinction flame temperature in an oxidizer deficient ambience, by comparing the relative visible (non-IR) luminosities of SiC filaments with thermocouple measured temperature in co-flowing, laminar propane/air diffusion flames. The results show good agreement between the digitized relative visible luminosity profiles of the SiC filaments and temperature profiles measured using a thermocouple at temperatures above $700^{\circ}C$, although, a non-linear calibration is probably required far the whole temperature range. The highest radial peak temperature exists near to the nozzle exit. and the centerline temperatures were virtually unchanged with increasing flame height in an oxidizer deficient near-extinction flame.
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.
심성훈(Shim, Sung-Hoon) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
MILD combustion has been successfully applied to gaseous fuels and few commercial systems are now in operation. Extending MILD combustion applicability to solid fuel of sawdust is the focus of the present work. The MILD combustion furnace at the University of Adelaide in Australia was used in this study. A measurement of O₂ and CO emissions have been carried out in parallel with consideration of NOx emission and compared in each modes of conventional natural gas combustion, natural gas MILD combustion, NOx emission in natural gas MILD combustion mode can be reduced to 20% in comparison with conventional combustion. Emission in cases of air carrying sawdust combustion and CO₂ carrying sawdust combustion were also compared. Air and CO₂ were sued as a carry gas for the sawdust. It was found that MILD conditions are possible for sawdust particles of less than 355{mu}m without additional air pre-heating. It was also found that when using CO₂ as the carry gas the flame inside the furnace was not visible anymore and that NOx emission dropped to less than two folds.