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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.
가스 쿡탑 버너에서 디자인 형상이 배기배출물에 미치는 영향
정용기(Yong Ki Jeong),김영수(Young Soo Kim),양대봉(Dae Bong Yang),김양호(Yang Ho Kim),류정완(Jung Wan Ryu),위재혁(Jae Hyug Wie),임재범(Jae Beom Lim),석준호(Jun Ho Seok),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
An experimental study was performed to investigate the effects of configuration of burner and air excess ration on CO & NOx emission characteristics of the cooktop burners which are used extensively. In this study, the combustion characteristics were investigated with the variation of design factor of cooktop turners. The results showed that as the thermal input increases, flammable region go narrower. With the increase of loading height from the cap to grate, the CO emission decrease owing to the reduction of quenching by flame impingement on the load. Additionally, the CO emission increase with angle of main slot, however the NO emission is almost unaffected.
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.
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.
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.
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/>
이중동축 메탄/공기 층류 부분 예혼합화염에서의 화염구조와 자발광 배출 특성 안쪽관 연료주입의 영향
오정석(Jeong Seog Oh),정용기(Yong Ki Jeong),전충환(Chung Hwan Jeon),장영준(Young June Chang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this study, the effect of central fuel injection on a coaxial laminar CH₄/air flame was experimented at the defined premixing condition(φ=1.90, σ=50/75/100%, x/D=10). The partial premixing parameter are the equivalence ratio that total fuel is fixed at 200cc/min, the fuel split degree which means the percentage of fuel entering the outer tube to the total amount, and the mixing distance indicating the nonreactant mixture's homogeneity between inner tube top and burner exit. The object is to investigate the flame structure and chemiluminescence characteristics of laminar partial premixed flame as changing mixing parameters. The radical signal was acquired from ICCD camera and PMT. Each intensity was compared with Abel inverted value for measuring the effect of background light on the peak signal location and the intensity at central preheat zone. The results show that the peak location of each radical was broaden as the fuel split degree increasing because the mixing quality was enhanced. and OH* is a good indicator for flame front between reaction and preheat zone. At last C₂* has the same tendency with CH* but a thinner reaction zone than CH* due to a rapid decay on the burned gas side.