• 제목/요약/키워드: excess enthalpy flame

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초과엔탈피 화염의 점근 해석 (An Asymptotic Analysis of Excess Enthalpy Flame)

  • 이대근
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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    • pp.135-137
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    • 2014
  • Excess enthalpy flame propagating an porous inert medium, which recirculate exhaust heat to the upstream cold mixture, is theoretically analyzed. Using the activation-energy asymptotics, the flame structure is divided into the thin reaction and the gas-phase preheat zone, as is traditionally done. Ahead and behind of the two, there exist an outer preheat zone, where heat is convectively transferred from solid to gas, and a downstream re-equilibrium zone, where thermal equilibrium between phases is established. Asymptotic solutions of species and energy equations in each zone are obtained and then matched to each other, and finally the mass burning rate is obtained as a function of the flame propagation velocity with respect to the solid phase and physical properties of gas and solid.

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질소로 과다 희석된 초과엔탈피 화염의 다공체 내 안정화 특성에 대한 실험적 연구 (Experimental Investigation on the Stabilization Characteristics of the Excess Enthalpy Flame Highly diluted with N2)

  • 김승곤;이대근;노동순;고창복;정종국
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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    • pp.139-140
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    • 2014
  • Stabilization characteristics of highly $N_2$-diluted $CH_4-O_2$ flame in an axially two-section porous inert medium were experimentally investigated for its application to the waste gas scrubber in semiconductor manufacturing processes. The flame behaviors were observed with respect to the fuel and $N_2$ flow rates and the equivalence ratios. As a result, four kinds of flame behaviors such as stable, flashback crossing the interface, blowout and sudden extinction were observed.

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다공성물질을 이용한 초단열 연소장치에서의 연소특성의 실험적 연구 (An Experimental Study on the Combustion Characteristics with Superadiabatic Combustor in Porous Media)

  • 채재우;;심민섭;정성찬
    • 설비공학논문집
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    • 제6권4호
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    • pp.399-405
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    • 1994
  • Beacuse of the energy resources exhaustion, the aggravating environmental air pollution and the smoke phenomena etc., the importance of clean gas fuel compared with liquid fuel is highly considered in recent years. The combustion system which consists of porous media is actively studied as a new method for solving above problems. Therefore, excess enthalpy combustion using porous media was interested by many researchers and investigated through numerical and experimental analysis. In this study, the simplified combustor has the unique combustion characteristics of mixture gas preheated effect using radiative and convective heat energy by changing the flow passage of unburned gas with solenoid valves and has the intensive excess enthalpy phenomena As the result of according to reduce equivalence ratio, flame temperature was remarkably higher than adiabatic flame temperature. This show the ability of super-lean combustion.

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다공체 내 연소의 열광전 발전에의 적용과 단일, 다중채널 및 다공체 내 초과 엔탈피 연소의 상사성 (Application of Combustion in Porous Inert Medium to Thermophotovoltaic Generation of Electricity and Excess Enthalpy Combustion Similarity to both Single and Multi-channels)

  • 이대근
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2012년도 제45회 KOSCO SYMPOSIUM 초록집
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    • pp.171-174
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    • 2012
  • Thermophotovoltaics is the direct energy conversion technology from thermal to electric (voltaic) energy via photon radiation, without any thermodynamic cycle. It is, in general, accomplished by immersing solid body in high temperature heat source (e.g. combustion field), in order to achieve high intensity irradiation, and by receiving the radiation thereof on photovoltaic cells. In this paper, advantages of combustion in porous inert medium in applying to the thermophotovoltaics are discussed in a view of its excess enthalpy features. In addition, the similarities of flame behaviors in porous inert medium to both in single and multi-channels are described.

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다공성 물질에 의한 열재순환 화염에 관한 실험적 연구 I

  • 유영돈;민대기;신현동
    • 대한기계학회논문집
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    • 제12권5호
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    • pp.1113-1120
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    • 1988
  • 본 연구에서는 4종류의 실험 모델을 채택하여 연소 반응용다공성 블럭(combu- stive reacting porous block)내의 화염대 위치와 화염의 온도 분포, 화염이 안정화 되는 범위를 고찰하여 내부 열재순환 효과를 규명하고 예열용 다공성 블럭(preheating porous block)과 복사 차폐용 다공성 블럭(radiative insulating porous block)의 효 과에 대한 연구와 초희박 혼합기나 저 발열량 연료의 연소 가능성을 제시하고 수치 계 산에 필요한 자료를 제시하는 것이다.

축방향 2단 다공체 내 N2로 과다 희석된 CH4-O2 화염의 안정화에 관한 실험적 연구 (Experimental Investigation on the Highly N2-diluted CH4-O2 Flame Stabilization in an Axially Two-section Porous Medium)

  • 김승곤;이대근;노동순;고창복
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2013년도 제46회 KOSCO SYMPOSIUM 초록집
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    • pp.45-46
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    • 2013
  • Stabilization characteristics of highly $N_2$-diluted $CH_4-O_2$ flame in an axially two-section porous inert medium were experimentally investigated for its application to the waste gas scrubber in semiconductor manufacturing processes. The flame behaviors were observed with respect to the fuel and $N_2$ flow rates and the equivalence ratios. As a result, four kinds of flame behaviors such as stable, flashback crossing the interface, blowout and sudden extinction were observed. It was also found that there exists two flame regime divided by a critical fuel flow rate. In addition, the flame stability was discussed based on the $N_2$ index which means the abatement capacity of our combustor in scrubbing the waste gas from the semiconductor processes.

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