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- 저자 : Kyungbeom Yoon (검색결과 2 건)
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대형디젤엔진에서 엔진운전조건 및 연료조건에 따른 PM과 SOF의 배출 특성
김경범(Kyungbeom Kim),윤여성(Yeoseong Yoon),강정호(Jungho Kang),오미혜(Mihye Oh),전광민(Kwang Min Chun) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
PM (Particulate Matter) and SOF (Soluble Organic Fraction) were measured for a 1 l liter heavy-duty diesel engine with four different diesel fuels. PM was trapped by MDT (Mini Dilution Tunnel) at different engine conditions. SOF was extracted from the PM sample by the Soxhlet extraction method. PM (g/kWh) emission was higher at lower engine load. The fuel density affected the PM and SOF emission characteristics. The fuels with higher density resulted in higher PM and SOF emission. SOF increased as engine load decreased at low speed. SOF was around 50% in high speed range at all tested engine load conditions.<br/>
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Numerical Study on Characteristics of Turbulent two-phase Gas-Particle Flow using Multi-fluid Model
Dongho Min,Kyungbeom Yoon,Heechul Chang,김태국 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.7
The purpose of this research is to study numerically the turbulent gas-particle two-phase flow characteristics using the Eulerian-Eulerian method. A computer code is developed for the numerical study by using the k -ε - kp two-phase turbulent model. The developed code is applied for particle-laden flows in which the particle volume fraction is between n 10−5 and 10−2 for the Stokes numbers smaller than unity. The gas and particle velocities and the particle volume fraction obtained by using this code are in good agreement with those obtained by a commercial code for the gas-particle jet flows within a rectangular enclosure. The gas-particle jet injected into a vertical rectangular 3D enclosure is numerically modeled to study the effect of the Stokes number, the particle volume fraction and the particle Reynolds numbers. The numerical results show that the Stokes number and the particle volume fraction are important parameters in turbulent gas-particle flows. A small Stokes number ( St ≤ 0.07) implies that the particles are nearly at the velocity equilibrium with the gas phase, while a large Stokes number ( St ≥ 0.07) implies that the slip velocity between the gas and particle phase increases and the particle velocity is less affected by the gas phase. A large particle volume fraction ( p α ≥ 0.0001) implies that the effect of the particles on the gas phase momentum increases, while a small particle volume fraction ( p α ≤ 0.0001) implies that the particles would have no or small effect on the gas flow field. For fixed Stokes number and particle volume fraction, an increase of the particle Reynolds number results in a decrease of the slip velocity between the gas and particle velocities.
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