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산소부화공기가 동축 비예혼합 제트의 연소특성에 미치는 영향 (II) - 화염의 구조와 온도분포 -
곽지현,전충환,장영준,Kwark, Ji-Hyun,Jeon, Chung-Hwan,Jang, Young-June 대한기계학회 2004 大韓機械學會論文集B Vol.28 No.2
Combustion using oxygen enriched air is known as a technology which can increase thermal efficiency due to increase of the flame temperature. Flame shapes, schlieren photos, OH radical chemiluminescence and local flame temperature were examined as a function of OEC(Oxygen Enriched Concentration) in a coaxial non-premixed jet. With increase of OEC, flame length and width decreased, but its brightness increased significantly, and the size of vortices in the flame also increased. Especially, the reaction around the flame surface became active. The strong OH intensity appeared to be made and moved from middle stream to upper one with increase of OEC, which shows combustion reaction in the upper stream becomes more dominant In addition, the temperature distributions of the flames showed similar tendency with OH radical intensities. A flame with high temperature and strong stability was obtained with increasing OEC of the coflow.
곽지현,전충환,장영준,Kwark, Ji-Hyun,Jun, Chung-Hwan,Jang, Young-June 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.8
An experiment was performed to investigate lift-off, blow-off and combustion characteristics of a lifted coaxial diffusion flame according to fuel jet and air velocity. A jet diffusion flame which is attached on the nozzle rim begins to be lifted with increase of air velocity, and finally becomes blow-off at higher air velocity. In experiment, blow-off limit increased with increase of fuel jet velocity, however lift-off occurred at lower air velocity. Flame structure and combustion characteristics were examined by schlieren photos, temperature distributions and emission concentration distributions. Flame temperature became higher at midstream and its RMS became larger at up and downstream with increase of air velocity. Local NO concentration decreased but $CO_2$concentration increased with increase of air velocity, which shows combustion reaction becomes close to be stoichiometric at higher air velocity in spite of lift-off.
층류 확산화염에서의 매연과 질소산화물의 배출특성 : 공기측/연료측 희석제 첨가에 따른 영향
이종호,엄재호,박철웅,전충환,장영준,Lee, Jong-Ho,Eom, Jae-Ho,Park, Chul-Woong,Jun, Chung-Hwan,Jang, Young-June 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.5
Present study has been conducted to see the relative effects of adding N: to fuel-side and air-side on flame structure, soot formation and NOx emissions. Experiments were carried out to ascertain to what degree chemical kinetics and/or molecular transport effects can explain the differences in soot formation and NOx emission by studying laminar diffusion flames. Direct photograph was taken to see the flame structure. CARS techniques was used to get the flame temperature profiles. And spatial distribution of soot could be obtained by PLII method. CHEMKIN code was also used to estimate the global residence time to predict NOx emissions at each condition. Results from these studies indicate that fuel-side dilution is more effective than air-side dilution in view of NOx emissions. However, air-side dilution shows greater effectiveness over fuel-side dilution in soot formation. And turbulent mixing and heat transfer problems were thought to be considered in practical applications.
남동현(Dong-hyun Nam),송주헌(Ju-Hun Song),장영준(Young-June Jang),전충환(Chung-Hwan Jeon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
This study is to investigate a flame structure and NOx emission on lean partially premixed gas turbine. The experiments were conducted to estimate the effect of fuel temperature (293, 313, 333K) at dump combustor inlet. The equivalence ratio was ranging from 0.55 to 0.85. This paper show that NOx emission was increased when concentration of OH radical is increased in same equivalence ratio. Finally, as fuel temperature increasing, NOx emissions was decreased on lean conditions
이병화(Byoung-hwa Lee),설동일(Dong-il Seol),장영준(Young-june Jang),전충환(Chung-hwan Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Many researches have been studied on in-cylinder flow as one of dominant effects for an engine combustion. Specially because the combustion flame speed is mainly determined by the turbulence at the end of compression process. Tumble and Turbulence ahead of combustion is very important phenomenon. As this phenomenon make research certainly, combustion condition will effectively be improve. This paper describes analytical results of the tumble flow, intensity, turbulence inside the cylinder of maritime engine. 3-D computation has been performed by using STAR-CD v3.26 solver and es-ice.
준안정 확산화염에서 레이저 유도 백열법을 이용한 매연 입자 분포에 관한 연구
김시현(See-hyun Kim),김규보(Gyu-bo Kim),조승완(Seung-wan Cho),이종호(Jong-ho Lee),정동수(Dong-soo Jeong),전충환(Chung-hwan Jeon),장영준(Young-june Jang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An experimental study on soot volume fraction measurement using laser induced incandescence (LII) in ethylene diffusion flame has been conducted. LII is a powerful technique to measure soot particle distribution and particle size. This technique is based on the heating of the particles by short laser pulse and the subsequent detection of the thermal radiation. An axisymmetric loud speaker was used to control fuel flow. The fuel flow conditions are made by using different two modes as sine and rectangular wave. The acoustic pulse duration of 10㎐ is selected for observing soot particle distribution in periodic flames. The experimental conditions are 0.045 lpm in the fuel flow rate and 50 lpm in the secondary air flow rate. Strain rate of periodic flame is more increasing than that of unforced flame. In the characteristics of the LII signals, it seems to be same tendency. That is to say, more soot particles are distributed in the periodic flames than unforced flames. This study has led to a better understanding of unsteady flame.