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메탄/공기 층류 부분예혼합화염의 상세 라디칼(OH*, CH* 그리고 C<sub>2</sub>*) 정보와 배기매출물에 관한 실험적 연구
정용기,오정석,전충환,장영준,Jeong Yong Ki,Oh Jeong Seog,Jeon Chung Hwan,Chang Young June 대한기계학회 2005 大韓機械學會論文集B Vol.29 No.2
An experimental study was performed to investigate the effects of partially premixing, varying the equivalence ratios from $0.79{\sim}{\infty}$, on NOx emissions and chemiluminescence of excited $OH^{\ast},\;CH^{ast}\;C_2^{\ast}$ radicals in laminar partially premixed flames. the signal from the electronically excited state of $OH^{\ast},\;CH^{ast}\;C_2^{\ast}$ was detected through a band pass filter with a photo multiplier tube, which are processed to the intensity ratio ($C_2^{\ast}/CH^{\ast},\;C_2^{\ast}/OH^{\ast},\;and\;CH^{\ast}/OH^{\ast}$) to reveal the correlation with local equivalence ratio. And measurements of NOx emission were made to investigate the relationship between visible flame appearance, chemiluminescence, and EINOX. The results demonstrated that (1) the flames at ${\phi}<1.59$ exhibited classical double flame structure, at ${\phi}>4.76$, the flames exhibited diffusion flame structure, and the intermediate flames at $1.59<{\phi}<4.76$ was a merged flame, (2) the $OH^{\ast}$ peak was located inside the $CH^{\ast}\;and\;C_2^{\ast}$ radical for all measured conditions and the emission intensity ratio of $C_2^{\ast}/CH^{\ast}\;and\;C_2^{\ast}/OH^{\ast}$ were identified as good marker for local equivalence ratio over a range of ${\phi}=0.79{\sim}1.2\;and\;CH^{\ast}/OH^{\ast}\;is\;0.79<{\phi}<1.9$. However, it was difficult to predict the equivalence ratio in partially premixed flames using this system for ${\phi}>2.38$, (3) the minimum NOX emission index (EINOx) is obtained for a equivalence ratio of 3.19 in the intermediate flames.
정용기,곽희로,신효섭,정춘병,남택주,Chung, Young-Ki,Kwak, Hee-Ro,Shin, Hyo-Sub,Chung, Chun-Byoung,Nam, Taik-Joo 한국전기기술인협회 2001 電力技術人 Vol.228 No.8
전기설비 분야에서는 사용하는 전압규격과 사용방식, 접지 System이 어떻게 조화를 이루냐에 따라 안전에 대한 확보여부가 결정된다. 지락 사고시 지락전류는 일정한 어느 한 부분으로만 흐르는 것이 아니라 접지저항의 상황에 따라 분류한다. 이러한 이유로 접지사항이 낮으면 안전하고 높으면 위험하다는 일반적인 잘못된 생각이 사고를 크게 확대시킬 수 있다. Presently the Korean grounding system uses TN system, multi-grounding method with IT independent grounding method. Nevertheless TN system can't exist with TT system in the technological terms. If they coexist, it causes ground-fault circuit not to operate, and brings about different electrical potential rise by customer system. It brings about serious problems for safety. This paper aims for improving method of grounding system based on the technical analysis on instances in foreign countries and Korea. Almost standards and construction manner were apt to be internationalized after WTO/TBT agreement was concluded. The internal grounding systems should meet the international criteria and reliability for safety, and be provided with technologically impeccable standards.
정용기(Young-Ki Chung),정종욱(Jong-Wook Jung),최명준(Myoung-Jun Choi),김재철(Jae-Chul Kim),박일한(Il-Han Park),곽희로(Hee-Ro Kwak) 한국조명·전기설비학회 1997 한국조명·전기설비학회 학술대회논문집 Vol.1997 No.-
This paper describes the technique for detecting failure symptom of mold transformer. This study uses the vibration signal analysis method and FEM as the technique. A loading back method is constructed for experiment, accelation sensors are adhered for measurement of vibration signal. Vibration signal measured by this method is analyzed into variation trend of measurement variables by control of control variables. Magnetic field distribution of molded winding is also acquired by FEM considering the design specification and the characteristics of insulation material in conclusion the relation of results between vibration signal and FEM is studied by these methods.
브로일 버너의 화염안정성과 배기배출물에 관한 실험적 연구
정용기(Yong-Ki Jeong),류정완(Jung-Wan Ryu),위재혁(Jae-Hyug Wie),임재범(Jae-Beom Lim),김양호(Yang-Ho Kim),양대봉(Dae-Bong Yang),김영수(Young-Soo Kim),장영준(Young-June Chang),전충환(Chung-Hwan Jeon) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
An experimental study was performed to investigate the effects of heat capacity and air excess ratio on CO emission characteristics of the broil burner in the gas oven range. Observations of flow characteristics occurring inside the both burner (general broil burner and a sheet metal burner), were investigated by measuring air excess ratio and CO emission characteristics. Combustion was achieved at the firing rate of 10,000~24,000Btuh, inlet pressure of 200~300㎜H2O. The primary air flow rate was found to be strongly dependent on the operating conditions, such as fuel flow rate. However air excess ratio calculated is constant without relation to fuel flow rate. There was a tendency that flame distance decreases as the air excess ratio increases because of momentum effect. In view of CO concentrations, there is a difference according to the heat capacity and flame guide. The effect of flame guide is great than the heat capacity.
가솔린 기관의 실린더 내의 정상 유동 상태의 단일 프레임 입자 영상 추적법을 이용한 보간법에 관한 연구
정용기(Yong-ki Jeong),전충환(Chung-hwan Jeon),장영준(Young-june Chang) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Recently, the researchers is studying in-cylinder flowfield for saving the expansion and time in gasoline engine development. One of these research method, PTV(particle tracking velocity) method is used to low density flowfield. In this paper, we are studying for developing single frame-PTV algorithm. we compare invert distance interpolation method with invert distance-area interpolation one in intake valve lift 2, 4, 6, 8mm. The more the intake valve lift increases, the velocity is stronger. The tumble flow is enlarged. And the invert distance-area interpolation method is more sensitive than invert distance interpolation.<br/>
염공부하에 따른 세라믹 화이버 버너의 배기 배출물과 분광학적 특성에 관한 연구
정용기(Yong Ki Jeong),이대래(Dae Rae Lee),김영수(Young Soo Kim),양대봉(Dae Bong Yang),김양호(Yang Ho Kim),류정완(Jung Wan Ryu),Alexander Yun,위재혁(Jae Hyug Wie),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An experimental study was performed to investigate the effects of both non-perforated and perforated ceramic fiber mat on temperature, CO, NO emission and radiation characteristics in porous ceramic fiber radiant burners. Observations of combustion characteristics occurring inside the burner system which was insulated fiber mat, were investigated by measuring emission and radiation characteristics. Combustion was achieved at the excess air ratio of 0.9~2, heat capacity of 1000~3000㎉/h. The local temperature distribution inside the mat and near the glass surface as a function of the equivalence ratio can be reasonably interpreted by the relation of the heat balance in the mat and movement of the reaction zone. CO emissions were found to be strongly dependent on the operating conditions. There was a tendency that CO concentration decreased as the excess air ratio increases. The NO concentration is maximal at the excess air ratio of approximately 1. The both fiber burner exhibit significant both spectral intensity peaks in the bands at 2.5㎛ and 4.0㎛ relatively.
정용기(Yong-Ki Jeong),김영수(Young-Soo Kim),이대래(Dae-Rae Lee),양대봉(Dae-Bong Yang),류정완(Jung-Wan Ryu),Alexander Yun,장영준(Young-June Chang),전충환(Chung-Hwan Jeon) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
An experimental study was performed to investigate the effects of mixing Quality, inlet pressure, nozzle diameter on CO emission and radiation characteristics in porous ceramic fiber radiant burners. Observations of combustion characteristics occurring inside the burner system which was insulated fiber mat, were investigated by measuring temperature, CO emission and radiation characteristics. Combustion was achieved at the firing rate of 88~99 ㎉/hr, inlet pressure of 100~250㎜H₂O. CO emissions were found to be strongly dependent on the operating conditions. There was a tendency that CO concentration increased as the firing rate increases. The reason for rise of CO concentration is that it becomes the relatively rich condition. The fiber burner exhibit significant both spectral intensity peaks in the bands at 2.5㎛ and 4.0㎛ relatively. There is a small difference in the variable mixing tube. However spectral intensity increased with the firing rate.