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RISS 인기검색어
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항공용 가스터빈 연소기 기본 설계 프로그램 개발 : Part 1 - 연소기 크기 결정
김대식(Daesik Kim),유경원(Gyong Won Ryu),황기영(Ki Young Hwang),민성기(Seong Ki Min) 한국연소학회 2013 한국연소학회지 Vol.18 No.3
This paper shows a general development process for aircraft gas turbine combustors. As a first step for developing the preliminary combustor design program, several combustor sizing methodologies using reference area concepts are reviewed. There are three ways to determine the reference area; 1) combustion efficiency approach, 2) pressure loss approach, 3) velocity assumption approach. The current study shows the comparisons of the calculated results of combustor reference values from the pressure loss and velocity assumption approaches. Further works are required to add iterative steps in the program using more reasonable values of pressure loss and velocities, and to evaluate the sizing results using data for actual combustor performance and sizes.
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와류 발생기를 장착한 가스터빈 연소기에서 연료/공기 혼합 및 NOx 배출 특성에 관한 수치적 연구
김구(Gu Kim),이영덕(Young Duk Lee),손채훈(Chae Hoon Sohn) 한국연소학회 2013 한국연소학회지 Vol.18 No.3
가스터빈용 희박 예혼합 연소기 내부에 와류 발생기(vortex generator)를 장착하여 그에 따른 연료/공기혼합 및 NOx 배출 특성 변화를 조사하였다. 이를 위해 수치해석적 방법을 채택하여 연소기내 유동특성, 연료/공기 혼합도, 배기가스(NOx), 화염형상을 분석하였다. 와류 발생기를 장착한 경우, 연소기 내부에서 와류 발생기에 의한 나사산 형상으로 인해 와류가 형성되며 이는 연소기 전면부까지 유지되었다. 또한 연소기 내부 면적 차로 인해 압력섭동이 발생하였다. 이와 더불어 연소기 전면부 기준 상류지역의 연료와 공기의 혼합도가 증가됨으로서 연료 과농지역이 감소하게 되며 이로 인해 전반적인 NOx 발생량의 감소 효과를 볼 수 있었다. 화염 형상의 변화로부터 와류 발생기의 영향으로 선회수는 다소 감소할 것으로 예상되며, 이는 와류 발생기로 인한 유속의 반복적 증감에 의한 결과라고 판단된다.
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이창엽,백승욱 한국연소학회 2005 한국연소학회지 Vol.10 No.2
An experimental study has been conducted to evaluate the effects of reburning on NOx reduction and also to examine heat transfer characteristics from LPG flame. Experiments were performed in flames stabilized by a co-flow swirl burner, which was mounted at the bottom of the furnace. Tests were conducted using LPG gas as main fuel and also as reburn fuel. The effects of reburn fuel fraction and injecting location of reburn fuel are studied. The paper reports data on flue gas emissions, temperature distribution in furnace and various heat fluxes at the wall for a wide range of experimental conditions. In a steady state, the total as well as radiative heat flux from the flame to the wall of furnace has been measured using a heat flux meter. Temperature distribution and emission formation in furnace have been also measured and compared.
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CO2 첨가에 따른 순산소 연소기의 연소특성에 관한 실험적 연구
서정일,이은도,홍정구,신현동,곽영태,배수호 한국연소학회 2005 한국연소학회지 Vol.10 No.2
The performance of oxygen combustion with CO2 feeding was investigated in a pyrex tube furnace. The inverse type multi-hole burner was used for improving mixing and wide operating range. It introduced oxygen, fuel, and oxygen, respectively, from center tube to outer tubes. Oxygen combustion characteristics with excess oxygen ratio, oxygen feeding ratio, and CO2 feeding flow rate were studied to optimize the operating condition and to apply the oxygen combustion with recirculation of flue gas to a real furnace. This paper presents results on the effect of CO2 feeding flow rate on the structure of the flames and concentrations of NO and CO emissions. The visible flame length was shortest due to well mixing between fuel and oxygen when the oxygen feeding ratio was 0.25. The NO emission was reduced drastically regardless of excess oxygen ratio when the CO2 feeding flow rate was larger than 15 lpm. The CO emission is varied by changing the CO2 feeding flow rate but the CO emission characteristics is highly affected by excess oxygen ratio. When the excess oxygen ratio is below λ=1.1, the CO emission increased as the CO2 feeding flow rate increased.
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30kg/hr급 열분해 용융소각로용 연소실에서 RDF의 연소 특성
전병일,황정호,박상욱,신동훈,류태우 한국연소학회 2005 한국연소학회지 Vol.10 No.1
In this study, we investigated characteristics of a gas flow and a combustion property during the combustion of a RDF in a pyrolysis melting incinerator with disposal rate of 30 kg/hr. The RDF was pyrolyzed through the pyrolysis chamber at 600℃ of the chamber surface without oxygen condition. The pyrolysis gas was injected in the combustion chamber. It was burned by means of the staged combustion that was injecting secondary and tertiary air in the combustor. We measured the temperatures and the gas components in the combustion chamber while maintaining the air-fuel ratio of 1.3. Finally, we confirm that additional air injection, secondary and tertiary air ratio, was the most important factor to reduce NOx.
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비회색 가스 복사를 고려한 층류대향류 부분예혼합 화염에서의CO2 및 H2O 첨가에 따른 영향 연구
조범진,김태국 한국연소학회 2005 한국연소학회지 Vol.10 No.3
Detailed flame structures of the counterflow flames of CH4/Air formed with CO2 and H2O addition are studied numerically. The detailed chemical reactions are modeled by using the OPPDIF and CHEMKIN-II code. Only the CO2 and H2O are assumed to participate in radiative heat transfer while all other gases are assumed to be transparent. The discrete ordinates method(DOM) and the narrow band based WSGGM with a gray gas regrouping technique(WSGGM-RG) are applied for modeling the radiative transfer through non-homogeneous and non-isothermal combustion gas mixtures generated by the counter flow flames. The results compared with the SNB model show that the WSGGM-RG is successful in modeling the counterflow flames with non-gray gas mixture. The numerical results show that the addition of CO2 and H2O to the oxidant nozzle lowers the peak temperature and the NO concentration in flame.
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