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CH<sub>4</sub>/Air 예혼합화염의 하류영역에서 체류시간 및 열손실에 의한 NOx의 생성특성
황철홍,현승호,탁영조,이창언,Hwang, Cheol-Hong,Hyun, Sung-Ho,Tak, Young-Jo,Lee, Chang-Eon 대한기계학회 2007 大韓機械學會論文集B Vol.31 No.1
In this study, the NOx formation characteristics of one-dimensional $CH_4$/Air premixed flame using detailed-kinetic chemistry are examined numerically. The combustor length and the amount of heat loss are varied to investigate the effect of residence time and heat loss on the NOx formation in a post-flame region. In the flame region, NO is mainly produced by the Prompt NO mechanism including $N_2$O-intermediate NO mechanism over all equivalence ratios. However, thermal NO mechanism is more important than Prompt NO mechanism in the post-flame region. In the case of adiabatic condition, the increase of combustor length causes the remarkable increase of NO emission at the exit due to the increase of residence time. On the other hand, NO reaches the equilibrium state in the vicinity of flame region, considering radiation and conduction heat losses. Furthermore the NO, in the case of $\phi$=1.2, is gradually reduced in the downstream region as the heat loss is increased. From these results, it can be concluded that the controls of residence time and heat loss in a combustor should be recognized as an important NOx reduction technology.
CH₄/Air 예혼합화염의 하류영역에서 NOx 생성특성에 관한 수치해석
현승호(Seung-Ho Hyun),황철홍(Cheol-Hong Hwang),탁영조(Young-Jo Tak),이창언(Chang-Eon Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In this study, the NOx formation characteristics of one-dimensional CH₄/Air premixed flame using detailed-kinetic chemistry are examined numerically. The combustor length and the amount of heat loss are varied to investigate the effect of residence time and heat loss on the NOx formation in a post-flame region. In the flame region, NO is mainly produced by the Prompt NO mechanism including N₂O-intermediate NO mechanism over all equivalence ratio. However, thermal NO mechanism is more important than Prompt NO mechanism in the post-flame region . In the case of adiabatic condition, the increase of combustor length causes the remarkable increase of NO em ission at the exit due to the increas e of residence time. On the other hand, NO reaches the equilibrium state in the vicinity of flame region, considering radiation and conduction heat transfer. Furthermore the NO, in the case of φ=1.2, is gradually reduced in the downstream region as the heat loss increase. From these results, it can be concluded that the control of heat loss and heat transfer near combustor wall should be recognized as an important NOx reduction technology.
디이젤 機關에서 排出되는 微粒子의 測定方法에 관한 硏究
卓泳祚,崔東憲,河鍾律 東亞大學校 大學院 1987 大學院論文集 Vol.12 No.-
The Mini-dilution tunnel has been designed and constructed for the diesel particulate emission measurement and in order to reduce the pariculate emission from diesel engines. In this system, raw exhaust is split off and then diluted in the tunnel with air to control the mixture temperature and the CO₂ tracer method is used to determine the dilution ratio for the calculation of particulate mass fraction For designing this system, experimental data relative to tunnel diameter, length, volume flow, mixture temperature degree of mixing and sampling flow rate were reviewed. Concequently, this mini-dilution tunnel system was found to have a good correlation with a larger dilution tunnel.
디젤기관에서 흡기습도가 연소에 미치는 영향에 관한 연구
탁영조,하종률 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1
It is important to reduce Smoke and NO_(x) which are a serious problem in the Diesel Engine. Thus, many studies for this problem have been performed. In this study, in order to obtain the information for the influence of inlet humidity on the combustion in the Diesel Engine, Combustion Characters, Engine Performace and Exhast gas emissions are analyzed experimentally.
直憤式 디이젤機關의 出力性能 및 排出微粒子에 미치는 吸氣 濕度의 影響에 관한 硏究
하종률,탁영조,정대간 동아대학교 환경문제연구소 1988 硏究報告 Vol.11 No.1
The engine output and particulate emission are influenced by inlet air humidity. This study is concerned with the engine output and particulate emission on the inlet air humidity. The engine performance was analized to P-θ diagram, the rate of pressure rised, the rate of heat release, and the rate of mass burned by means of combustion analysis system. The particulate emission measurement is made by mini-dilution tunnel system. Consequently, this study showes the qualitative relationship between the engine output or particulate emission and the inlet air humidity.
A COMPUTER ASSISTED OPTIMIZATION APPROACH TO THE DESIGN OF A SPARK IGNITION ENGINE
Kim,Chi-Won,Chang,Tae-Hyun,Tak,Young-Jo 慶南大學校 附設 工業技術硏究所 1988 硏究論文集 Vol.6 No.-
本 硏究는 VAX/VAM 電算機를 利用하여 內燃機關部品 設計에 最適化 理論을 使用하였다. 機關構成要素, 作動流體通路 및 機關速度로부터 發生하는 摩擦效果에 대하여 解釋的인 接近을 하여 機關에 전 摩擦을 最小化하여 最適設計와 機關性能을 向上코져 그 課程을 發展시켰다. This study is a computer assisted optimization approach to the design of internal combustion engine. The analysis relates the mechanical and fluid frictional effects which arise from the engine structure components, air passage and engine piston speed. The objective of this project is to develop a procedure to optimize the design constraints and performance criteria for minimizing the total friction in engine.