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초음파 에너지 부가연료 사용시 디젤기관의 성능특성에 관한 연구(Ⅱ)
박종규(J.K.Park),윤면근(M.K.Yoon),최두석(D.S.Choi),김관태(K.T.Kim),류정인(J.I.Ryu) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
This study was undertaken to investigate the characteristics of diesel fuel added ultrasonic energy. We compared conventional diesel fuel with diesel fuel added ultrasonic energy in Branch Index result from ¹H-NMR spectrum and viscosity. Also. Droplet size measurements using Malvem system were made to evaluate the effect of ultrasonic energy. Having performed these experiments. we obtained the results as follows.<br/> 1. Branch Index and viscosity of diesel fuel was reduced as ultrasonic energy added time<br/> increased.<br/> 2. SMD of diesel fuel added ultrasonic energy was smaller than that of conventional diesel<br/> fuel.<br/> 3. SMD was reduced as injection pressure increased. <br/> 4. Regardless of the type of injector, SMD variation with distance from injector was<br/> proportional.<br/>
황나경(N. K. Hwang),차민석(M. S. Cha),이대훈(D. H. Lee),김관태(K. T. Kim),이재옥(J. O. Lee),송영훈(Y.-H. Song) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
The reaction mechanism of methane dry reforming has been investigated using an arc-jet reactor. The effects of input power, CO₂ /CH₄ and added O₂ were investigated by product analysis, including CO, H₂, C₂HY and C₃HY as well as CH₄ and CO₂. In the process, input electrical power activated the reactions between CH₄ and CO₂ significantly. The increased feed ratio of the CO₂ to CH₄ in the dry reforming doesn't affect to the CH₄ conversion but increase the selectivity of CO with suppressing the reaction of H₂ generation. Added oxygen can also increase not only CO selectivity but also CH₄ conversion, For more understanding these results. the reaction has been compared with thermo-equilibrium calculation.
Rotating arc plasma를 이용한 암모니아 처리 연구
강희석(H S Kang),김관태(K-T Kim),이대훈(D H Lee),송영훈(Y-H Song),I M Kim 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Rotating arc reactors have several potential advantages over typical non-thermal plasmas and arc torches, particularly in terms of the controlled thermal environment and power efficiency. Such reactors exhibit several modes of operation, each of which can be associated with different process efficiencies. Here we investigate the factors controlling the different modes of operation and the efficiency in each mode. We map the conditions required for realizing each mode. Further, we verify our findings in an experiment for NH₃ decomposition. Our results could be used as a guide for the design of apractical and highly efficient rotating arc reactor.
최항석(H.S. Choi),김관태(K.T. Kim),김석준(S.J. Kim),정상현(S.H. Jeong),송영훈(Y.H. Song),홍성호(S.H. Hong),이준엽(J.Y. Lee) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
In this study, to increase the mixing between flue gas and reducing agent, new shapes of NH₃ ejection nozzles are designed and experimentally and numerically tested. The nozzles have six holes perpendicular to the ambient flue gas flow and the tilting angle between direction of ambient flow and the hole axis is varied. To evaluate the mixing efficiency of the proposed nozzles, numerical and experimental tests are applied to several flow conditions comparing with single hole nozzle, which is commonly used in conventional SCR process. From the results the nozzle with tilted multi-holes has the large region of high turbulent intensity compared with conventional single hole nozzle. This is originated from the high vorticity near the upstream of the jet flow issuing from the hole. The high turbulent intensity and vorticity magnitude lead to enhanced mixing between flue gas and reducing agent. Hence, the most suitable moral ratio between NOx and reducing agent for the catalytic reaction can be obtained on behalf of the intensified scalar mixing within shorter physical mixing length.
이동륜(D. R. Lee),이대훈(D. H. Lee),조성권(S. K. Jo),김관태(K. T. Kim),정은상(E. S. Jung) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Plasma burner can maintain the flame in broad O₂/C ratio so it has been used in many ways. In this work, the characteristics of plasma burner on high speed flow rate have been investigated. The experiment was conducted in different O₂/C ratio. We found that max voltage is proportional to flow rate. In other words, the rotating arc becomes longer as flow rate increases. We found that methane removal rate is inversely proportional to flow rate and proportional to O₂/C ratio. The diameter of pipe can also have effect to methane removal ratio.