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안국영(Kook-Young Ahn),김한석(Han-Seok Kim),이윤원(Yun-Won Lee),황철홍(Chul-Hong Hwang) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.11
The oxygen enhanced combustion technology is becoming important to save the energy and capture CO₂. Recently, concern to reduce the CO₂ has led many researchers to investigate the combustion phenomena including O₂ and CO₂ as oxidizer. A method to capture CO₂ using oxidizer control is firing the fuel in pure or highly enhanced oxygen instead of air. When firing fuel in pure oxygen, the flame temperature is much higher than in air. Flue gas, containing chiefly CO₂, recirculation is necessary to reduce the flame temperature. In this paper the combustion characteristics of oxygen enhanced and CO₂ recirculated flame have been investigated. The emission characteristics, flame stability and the flame temperature were studied experimentally. The compositions of oxidizer were varied by substituting N2 with CO₂ at the constant O₂ concentration. As the CO₂ is increased, the flame became unstable and the CO and NO were decreased due to the heat capacity and radiation effect. Also, the combustion characteristics according to the oxygen enhancement were discussed.
안국영,김한석,안진혁,배형수,Ahn, Kook-Young,Kim, Han-Seok,Ahn, Jin-Hyuk,Pae, Hyoung-Su 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.10
The combustion characteristics have been investigated to develop the 50 kW-class gas turbine combustor. The combustor design program was developed and applied to design this combustor. The combustion air which has the temperature of 45, 200, $300^{\circ}C$ were supplied to combustor for elucidating the effect of inlet air temperature on CO, NOx emissions and flame temperature. The exit temperature and NO were increased and CO was decreased with increasing inlet air temperature. Also, the effect of equivalence ratio was considered to verify the combustor performance. The emissions of CO and NO with inlet air temperature can be analyzed qualitatively by measuring the temperature inside the combustor. The combustion performance with fuel schedule was evaluated to get the informations of the starting and part loading process of gas turbine. The combustion was stable above the equivalence ratio of 0.18. The pattern factor which is the important parameter of combustor performance was satisfied with the design criterion. Consequently the combustor was proved to meet the performance goal required for the target gas turbine system.
김영철(Young-Cheol Kim),안국영(Kook-Young Ahn) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
For the purpose of high outlet pressure, compactness and low vibration and noise, 2 stage reciprocating air compressors can have various cylinder arrangement opposed, in-line. and V type This paper presents an effective method to calculate the inertia forces and to design counter weight. This method is based on the complex representation for the orbital behavior of the compressor shaft. This method help to find the optimal balancing rate easily to reduce the inertial force or moment. This paper shows that the compressor shaft having single throw remains the residual inertia force and the one having double throws remains the residual inertia moment.
함영복(Young-Bog Ham),윤동원(Dong-Won Youn),조원용(Won-Yong Cho),박중호(Jung-Ho Park),윤소남(So-Nam Yun),안국영(Kook-Young Ahn) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Recently, piezoelectric actuator has been applied in the various fields of industry such as life science, automotive, IT and telecom. The PZT actuator is used by the reverse piezoelectric effect, which generated a mechanical displacement in the electric field. Because the displacement of this actuator is 1/1000 times of PZT element thickness or height with high voltage, this actuator has to combine with a displacement amplified mechanism. In this paper, the PZT actuator has 10 times amplified displacement using hinge-lever magnification mechanism. The free load displacement of multilayer PZT is 56㎛ at input voltage of 100Vdc, and the proposed mechanism has maximum amplified displacement of 684㎛ through the experiment. The frequency response of PZT actuator having hinge-lever mechanism is measured as resonance frequency. As a result, the resonance frequency of PZT actuator is 209.7㎐ in simulation and 204㎐ in experiment.
동축 공기다단 LPG화염의 NOx 생성특성에 관한 연구
김한석,안국영,김호근,유명종,백승욱,Kim, Han-Seok,Ahn, Kook-Young,Kim, Ho-Keun,Yu, Myung-Jong,Baek, Seung-Wook 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.2
Experimental and numerical studies have been done to examine the effects of excess air ratio and tertiary air swirl number on the formation characteristics of NOx in a pilot scale combustor adopting a multi-air staged burner. In numerical calculation the mathematical models for turbulence, radiation and nitric oxide chemistry were taken into account. The radiative transfer equation was solved using the discrete ordinates method with the weighted sum of gray gases model. In the NOx chemistry model, the chemical reaction rates for thermal and prompt NOx were statistically averaged using a probability density function. The results were validated by comparison with measurements. For the experiment, a 0.2 MW pilot multi-staged air burner has been designed and fabricated. Using the numerical simulation developed here, a variation of thermal and prompt NOx formation was predicted by changing the excess air ratio and tertiary air swirl number. As the excess air ratio increased up to 1.9, the formation of the total as well as thermal NOx at exit increased while the prompt NOx decreased. The formation of thermal NOx was more affected by concentration of $O_2$ and $N_2$ than gas temperature. When the tertiary air swirl number increased, the formation of the total as well as the prompt NOx slightly decreased.